summaryrefslogtreecommitdiffstats
path: root/Misc/NEWS
blob: 1495bdd32670cd9a530ff67ba59f3481412d13b6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
+++++++++++
Python News
+++++++++++

What's New in Python 3.1.4?
===========================

*Release date: XXXX-XX-XX*

Core and Builtins
-----------------

- Issue #10892: Don't segfault when trying to delete __abstractmethods__ from a
  class.

- Issue #8020: Avoid a crash where the small objects allocator would read
  non-Python managed memory while it is being modified by another thread.
  Patch by Matt Bandy.

- Issue #8278: On Windows and with a NTFS filesystem, os.stat() and os.utime()
  can now handle dates after 2038.

- Issue #4236: PyModule_Create2 now checks the import machinery directly
  rather than the Py_IsInitialized flag, avoiding a Fatal Python
  error in certain circumstances when an import is done in __del__.

- Issue #10596: Fix float.__mod__ to have the same behaviour as
  float.__divmod__ with respect to signed zeros.  -4.0 % 4.0 should be
  0.0, not -0.0.

- Issue #5587: add a repr to dict_proxy objects.  Patch by David Stanek and
  Daniel Urban.

Library
-------

- Issue #10916: mmap should not segfault when a file is mapped using 0 as
  length and a non-zero offset, and an attempt to read past the end of file
  is made (IndexError is raised instead).  Patch by Ross Lagerwall.

- Issue #10899: No function type annotations in the standard library.
  Removed function type annotations from _pyio.py.

- Issue #10875: Update Regular Expression HOWTO; patch by 'SilentGhost'.

- Issue #10869: Fixed bug where ast.increment_lineno modified the root
  node twice.

- Issue #5871: email.header.Header.encode now raises an error if any
  continuation line in the formatted value has no leading white space
  and looks like a header.  Since Generator uses Header to format all
  headers, this check is made for all headers in any serialized message
  at serialization time.  This provides protection against header
  injection attacks.

- Issue #7858: Raise an error properly when os.utime() fails under Windows
  on an existing file.

- Issue #3839: wsgiref should not override a Content-Length header set by
  the application.  Initial patch by Clovis Fabricio.

- Issue #10790: email.header.Header.append's charset logic now works correctly
  for charsets whose output codec is different from its input codec.

- Issue #6643: Reinitialize locks held within the threading module after fork
  to avoid a potential rare deadlock or crash on some platforms.

- Issue #10806, issue #9905: Fix subprocess pipes when some of the standard
  file descriptors (0, 1, 2) are closed in the parent process.  Initial
  patch by Ross Lagerwall.

- Issue 10753 - Characters ';','=' and ',' in the PATH_INFO environment
  variable won't be quoted when the URI is constructed by the wsgiref.util 's
  request_uri method. According to RFC 3986, these characters can be a part of
  params in PATH component of URI and need not be quoted.

- Issue 10738: Fix webbrowser.Opera.raise_opts

- Issue 9824: SimpleCookie now encodes , and ; in values to cater to how
  browsers actually parse cookies.

- Issue #5258/#10642: if site.py encounters a .pth file that generates an error,
  it now prints the filename, line number, and traceback to stderr and skips
  the rest of that individual file, instead of stopping processing entirely.

- Issue #4871: The zipfile module now gives a more useful error message if
  an attempt is made to use a string to specify the archive password.

- Issue #10750: The ``raw`` attribute of buffered IO objects is now read-only.

- Issue #6791: Limit header line length (to 65535 bytes) in http.client
  and http.server, to avoid denial of services from the other party.

- Issue #10404: Use ctl-button-1 on OSX for the context menu in Idle.

- Issue #4188: Avoid creating dummy thread objects when logging operations
  from the threading module (with the internal verbose flag activated).

- Issue #9721: Fix the behavior of urljoin when the relative url starts with a
  ';' character. Patch by Wes Chow.

- Issue #10714: Limit length of incoming request in http.server to 65536 bytes
  for security reasons.  Initial patch by Ross Lagerwall.

- Issue #9558: Fix distutils.command.build_ext with VS 8.0.

- Issue #10695: passing the port as a string value to telnetlib no longer
  causes debug mode to fail.

- Issue #1078919: add_header now automatically RFC2231 encodes parameters
  that contain non-ascii values.

- Issue #10107: Warn about unsaved files in IDLE on OSX.

- Issue #7904: Changes to urllib.parse.urlsplit to handle schemes as defined by
  RFC3986. Anything before :// is considered a scheme and is followed by an
  authority (or netloc) and by '/' led path, which is optional.

- Issue #10478: Reentrant calls inside buffered IO objects (for example by
  way of a signal handler) now raise a RuntimeError instead of freezing the
  current process.

- Issue #10464: netrc now correctly handles lines with embedded '#' characters.

- Issue #1731717: Fixed the problem where subprocess.wait() could cause an
  OSError exception when The OS had been told to ignore SIGCLD in our process
  or otherwise not wait for exiting child processes.

Extensions
----------

- Issue #678250: Make mmap flush a noop on ACCESS_READ and ACCESS_COPY.

Build
-----

- Issue #7716: Under Solaris, don't assume existence of /usr/xpg4/bin/grep in
  the configure script but use $GREP instead.  Patch by Fabian Groffen.

- Issue #10475: Don't hardcode compilers for LDSHARED/LDCXXSHARED on NetBSD
  and DragonFly BSD.  Patch by Nicolas Joly.

- Issue #10655: Fix the build on PowerPC on Linux with GCC when building with
  timestamp profiling (--with-tsc): the preprocessor test for the PowerPC
  support now looks for "__powerpc__" as well as "__ppc__": the latter seems to
  only be present on OS X; the former is the correct one for Linux with GCC.

Tests
-----

- Issue #10822: Fix test_posix:test_getgroups failure under Solaris.  Patch
  by Ross Lagerwall.

- Issue #6293: Have regrtest.py echo back sys.flags.  This is done by default
  in whole runs and enabled selectively using ``--header`` when running an
  explicit list of tests.  Original patch by Collin Winter.

- Issue #775964: test_grp now skips YP/NIS entries instead of failing when
  encountering them.

- Issue #7110: regrtest now sends test failure reports and single-failure
  tracebacks to stderr rather than stdout.


What's New in Python 3.1.3?
===========================

*Release date: 2010-11-27*

Core and Builtins
-----------------

- Issue #10391: Don't dereference invalid memory in error messages in the ast
  module.

Library
-------

- Issue #10323: itertools.islice() now consumes the minimum number of
  inputs before stopping.  Formerly, the final state of the underlying
  iterator was undefined.

- Issue #10565: The collections.Iterator ABC now checks for both
  __iter__ and __next__.

- Issue #10561: In pdb, clear the breakpoints by the breakpoint number.

- Issue #10459: Update CJK character names to Unicode 5.1.

- Issue #10092: Properly reset locale in calendar.Locale*Calendar classes.

- Issue #6098: Don't claim DOM level 3 conformance in minidom.

- Issue #5762: Fix AttributeError raised by ``xml.dom.minidom`` when an empty
  XML namespace attribute is encountered.

- Issue #1710703: Write structures for an empty ZIP archive when a ZipFile is
  created in modes 'a' or 'w' and then closed without adding any files. Raise
  BadZipfile (rather than IOError) when opening small non-ZIP files.

- Issue #4493: urllib.request adds '/' in front of path components which does not
  start with '/. Common behavior exhibited by browsers and other clients.

- Issue #6378: idle.bat now runs with the appropriate Python version rather than
  the system default. Patch by Sridhar Ratnakumar.

- Issue #10407: Fix two NameErrors in distutils.

- Issue #10198: fix duplicate header written to wave files when writeframes()
  is called without data.

- Issue #10467: Fix BytesIO.readinto() after seeking into a position after the
  end of the file.

- Issue #1682942: configparser supports alternative option/value delimiters.

Build
-----

- Don't run pgen twice when using make -j.

- Backport r83399 to allow test_distutils to pass on installed versions.

- Issue #1303434: Generate ZIP file containing all PDBs (already done for rc1).

- Stop packaging versioncheck tool (already done for rc1).

- Accept Oracle Berkeley DB 4.8, 5.0 and 5.1 as backend for the dbm extension.

Tests
-----

- Issue #9424: Replace deprecated assert* methods in the Python test suite.

Documentation
-------------

- Issue #10299: List the built-in functions in a table in functions.rst.


What's New in Python 3.1.3 release candidate 1?
===============================================

*Release date: 2010-11-13*

Core and Builtins
-----------------

- Issue #10221: dict.pop(k) now has a key error message that includes the
  missing key (same message d[k] returns for missing keys).

- Issue #5437: A preallocated MemoryError instance should not hold traceback
  data (including local variables caught in the stack trace) alive infinitely.

- Issue #10077: Fix logging of site module errors at startup.

- Issue #10186: Fix the SyntaxError caret when the offset is equal to the length
  of the offending line.

- Issue #9713, #10114: Parser functions (eg. PyParser_ASTFromFile) expects
  filenames encoded to the filesystem encoding with surrogateescape error
  handler (to support undecodable bytes), instead of UTF-8 in strict mode.

- Issue #10006: type.__abstractmethods__ now raises an AttributeError.  As a
  result metaclasses can now be ABCs (see #9533).

- Issue #9997: Don't let the name "top" have special significance in scope
  resolution.

- Issue #9930: Remove bogus subtype check that was causing (e.g.)
  float.__rdiv__(2.0, 3) to return NotImplemented instead of the
  expected 1.5.

- Issue #9804: ascii() now always represents unicode surrogate pairs as
  a single ``\UXXXXXXXX``, regardless of whether the character is printable
  or not.  Also, the "backslashreplace" error handler now joins surrogate
  pairs into a single character on UCS-2 builds.

- Issue #9797: pystate.c wrongly assumed that zero couldn't be a valid
  thread-local storage key.

- Issue #9737: Fix a crash when trying to delete a slice or an item from
  a memoryview object.

- Issue #7415: PyUnicode_FromEncodedObject() now uses the new buffer API
  properly.  Patch by Stefan Behnel.

- Restore GIL in nis_cat in case of error.

- Issue #9712: Fix tokenize on identifiers that start with non-ascii names.

- Issue #9688: __basicsize__ and __itemsize__ must be accessed as Py_ssize_t.

- Issue #5319: Print an error if flushing stdout fails at interpreter
  shutdown.

- Issue #8814: function annotations (the ``__annotations__`` attribute)
  are now included in the set of attributes copied by default by
  functools.wraps and functools.update_wrapper.  Patch by Terrence Cole.

- Issue #83755:  Implicit set-to-frozenset conversion was not thread-safe.

- Issue #10068: Global objects which have reference cycles with their module's
  dict are now cleared again. This causes issue #7140 to appear again.

- Issue #9416: Fix some issues with complex formatting where the
  output with no type specifier failed to match the str output:

    - format(complex(-0.0, 2.0), '-') omitted the real part from the output,
    - format(complex(0.0, 2.0), '-') included a sign and parentheses.

- Issue #7616: Fix copying of overlapping memoryview slices with the Intel
  compiler.

- Issue #8271: during the decoding of an invalid UTF-8 byte sequence, only the
  start byte and the continuation byte(s) are now considered invalid, instead
  of the number of bytes specified by the start byte.
  E.g.: '\xf1\x80AB'.decode('utf-8', 'replace') now returns u'\ufffdAB' and
  replaces with U+FFFD only the start byte ('\xf1') and the continuation byte
  ('\x80') even if '\xf1' is the start byte of a 4-bytes sequence.
  Previous versions returned a single u'\ufffd'.

- Issue #6543: Write the traceback in the terminal encoding instead of utf-8.
  Fix the encoding of the modules filename. Patch written by Amaury Forgeot
  d'Arc.

- Issue #9058: Remove assertions about INT_MAX in UnicodeDecodeError.

- Issue #8941: decoding big endian UTF-32 data in UCS-2 builds could crash
  the interpreter with characters outside the Basic Multilingual Plane
  (higher than 0x10000).

- In the str.format(), raise a ValueError when indexes to arguments are too
  large.

- Issue #8766: Initialize _warnings module before importing the first module.
  Fix a crash if an empty directory called "encodings" exists in sys.path.

- PyObject_Dump() encodes unicode objects to utf8 with backslashreplace
  (instead of strict) error handler to escape surrogates

- Issue #8124: PySys_WriteStdout() and PySys_WriteStderr() don't execute
  indirectly Python signal handlers anymore because mywrite() ignores
  exceptions (KeyboardInterrupt)

- Issue #8092: Fix PyUnicode_EncodeUTF8() to support error handler producing
  unicode string (eg. backslashreplace)

- Issue #8014: Setting a T_UINT or T_PYSSIZET attribute of an object with
  PyMemberDefs could produce an internal error;  raise TypeError instead.

- Issue #8417: Raise an OverflowError when an integer larger than sys.maxsize is
  passed to bytes or bytearray.

- Issue #8329: Don't return the same lists from select.select when no fds are
  changed.

- Raise a TypeError when trying to delete a T_STRING_INPLACE struct member.

- Issue #8226: sys.setfilesystemencoding() raises a LookupError if the encoding
  is unknown

- Issue #1583863: An str subclass can now override the __str__ method

- Issue #7072: isspace(0xa0) is true on Mac OS X

C-API
-----

- Issue #9834: Don't segfault in PySequence_GetSlice, PySequence_SetSlice, or
  PySequence_DelSlice when the object doesn't have any mapping operations
  defined.

- Issue #5753: A new C API function, :cfunc:`PySys_SetArgvEx`, allows
  embedders of the interpreter to set sys.argv without also modifying
  sys.path.  This helps fix `CVE-2008-5983
  <http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5983>`_.

Library
-------

- Issue #5111: IPv6 Host in the Header is wrapped inside [ ]. Patch by Chandru.

- Issue #4471: Properly shutdown socket in IMAP.shutdown().  Patch by
  Lorenzo M. Catucci.

- Fix IMAP.login() to work properly.

- Issue #10126: Fix distutils' test_build when Python was built with
  --enable-shared.

- Fix typo in one sdist option (medata-check).

- Issue #9199: Fix incorrect use of distutils.cmd.Command.announce.

- Issue #1718574: Fix options that were supposed to accept arguments but did
  not in build_clib.

- Issue #9281: Prevent race condition with mkdir in distutils.  Patch by
  Arfrever.

- Issue #10229: Fix caching error in gettext.

- Issue #10252: Close file objects in a timely manner in distutils code and
  tests.  Patch by Brian Brazil, completed by Éric Araujo.

- Issue #10311: The signal module now restores errno before returning from
  its low-level signal handler.  Patch by Hallvard B Furuseth.

- The keyword only restriction for the places argument in
  unittest.TestCase.assert[Not]AlmostEqual methods has been removed.

- Issue 6706: asyncore accept() method no longer raises EWOULDBLOCK/ECONNABORTED
  on incomplete connection attempt but returns None instead.

- Issue #10266: uu.decode didn't close in_file explicitly when it was given
  as a filename.  Patch by Brian Brazil.

- Issue #10246: uu.encode didn't close file objects explicitly when filenames
  were given to it.  Patch by Brian Brazil.

- Issue #10253: FileIO leaks a file descriptor when trying to open a file
  for append that isn't seekable.  Patch by Brian Brazil.

- Issue #5027: The standard ``xml`` namespace is now understood by
  xml.sax.saxutils.XMLGenerator as being bound to
  http://www.w3.org/XML/1998/namespace.  Patch by Troy J. Farrell.

- #7761: telnetlib.interact failures on Windows fixed.

- Issue #5117: Case normalization was needed on ntpath.relpath(). And
  fixed root directory issue on posixpath.relpath(). (Ported working fixes
  from ntpath)

- Issue #10041: The signature of optional arguments in socket.makefile()
  didn't match that of io.open(), and they also didn't get forwarded
  properly to TextIOWrapper in text mode.  Patch by Kai Zhu.

- Issue #6612: Fix site and sysconfig to catch os.getcwd() error, eg. if the
  current directory was deleted. Patch written by W. Trevor King.

- Issue #9759: GzipFile now raises ValueError when an operation is attempted
  after the file is closed.  Patch by Jeffrey Finkelstein.

- Issue #9042: Fix interaction of custom translation classes and caching in
  gettext.

- Issue #9065: tarfile no longer uses "root" as the default for the uname and
  gname field.

- Issue #8980: Fixed a failure in distutils.command check that was shadowed
  by an environment that does not have docutils. Patch by Arfrever.

- Issue #1050268: parseaddr now correctly quotes double quote and backslash
  characters that appear inside quoted strings in email addresses.

- Issue #10004: quoprimime no longer generates a traceback when confronted
  with invalid characters after '=' in a Q-encoded word.

- Issue #9950: Fix socket.sendall() crash or misbehaviour when a signal is
  received.  Now sendall() properly calls signal handlers if necessary,
  and retries sending if these returned successfully, including on sockets
  with a timeout.

- Issue #9936: Fixed executable lines' search in the trace module.

- Issue #9928: Properly initialize the types exported by the bz2 module.

- Issue #9854: The default read() implementation in io.RawIOBase now
  handles non-blocking readinto() returning None correctly.

- Issue #9853: Fix the signature of SSLSocket.recvfrom() and
  SSLSocket.sendto() to match the corresponding socket methods.

- Issue #9792: In case of connection failure, socket.create_connection()
  would swallow the exception and raise a new one, making it impossible
  to fetch the original errno, or to filter timeout errors.  Now the
  original error is re-raised.

- Issue #9826: OrderedDict.__repr__ can now handle self-referential
  values:   d['x'] = d.

- Issue #9758: When fcntl.ioctl() was called with mutable_flag set to True,
  and the passed buffer was exactly 1024 bytes long, the buffer wouldn't
  be updated back after the system call.  Original patch by Brian Brazil.

- Issue #6656: fix locale.format_string to handle escaped percents
  and mappings.

- Issue #1100562: Fix deep-copying of objects derived from the list and
  dict types.  Patch by Michele Orrù and Björn Lindqvist.

- Issue #9753: Fixed socket.dup, which did not always work correctly
  on Windows.

- Issue #1868: Eliminate subtle timing issues in thread-local objects by
  getting rid of the cached copy of thread-local attribute dictionary.

- Issue #8797: urllib2 does a retry for Basic Authentication failure instead of
  falling into recursion.

- Issue #1194222: email.utils.parsedate now returns RFC2822 compliant four
  character years even if the message contains RFC822 two character years.

- Issue #8750: Fixed MutableSet's methods to correctly handle
  reflexive operations, namely x -= x and x ^= x.

- Issue #9129: smtpd.py is vulnerable to DoS attacks deriving from missing
  error handling when accepting a new connection.

- Issue #658749: asyncore's connect() method now correctly interprets winsock
  errors.

- Issue #9214: Set operations on KeysView or ItemsView in the collections
  module now correctly return a set.  (Patch by Eli Bendersky.)

- Issue #9617: Signals received during a low-level write operation aren't
  ignored by the buffered IO layer anymore.

- Issue #9605: posix.getlogin() decodes the username with file filesystem
  encoding and surrogateescape error handler. Patch written by David Watson.

- Issue #9603: posix.ttyname() and posix.ctermid() decode the terminal name
  using the filesystem encoding and surrogateescape error handler. Patch
  written by David Watson.

- Issue #8688: MANIFEST files created by distutils now include a magic
  comment indicating they are generated.  Manually maintained MANIFESTs
  without this marker will not be overwritten or removed.

- Issue #7467: when reading a file from a ZIP archive, its CRC is checked
  and a BadZipfile error is raised if it doesn't match (as used to be the
  case in Python 2.5 and earlier).

- Issue #9550: a BufferedReader could issue an additional read when the
  original read request had been satisfied, which could block indefinitely
  when the underlying raw IO channel was e.g. a socket.  Report and original
  patch by Jason V. Miller.

- Issue #6915: Under Windows, os.listdir() didn't release the Global
  Interpreter Lock around all system calls.  Original patch by Ryan Kelly.

- Issue #3757: thread-local objects now support cyclic garbage collection.
  Thread-local objects involved in reference cycles will be deallocated
  timely by the cyclic GC, even if the underlying thread is still running.

- Fix Issue8280 - urllib2's Request method will remove fragements in the url.
  This is how it is supposed to work, wget and curl do the same.  Previous
  behavior was wrong.

- Issue #2944: asyncore doesn't handle connection refused correctly.

- Issue #3196: email header decoding is now forgiving if an RFC2047
  encoded word encoded in base64 is lacking padding.

- Issue #8447: Make distutils.sysconfig follow symlinks in the path to
  the interpreter executable.  This fixes a failure of test_httpservers
  on OS X.

- Issue #7372: Fix pstats regression when stripping paths from profile
  data generated with the profile module.

- Issue #4108: In urllib.robotparser, if there are multiple 'User-agent: *'
  entries, consider the first one.

- Issue #8397: Raise an error when attempting to mix iteration and regular
  reads on a BZ2File object, rather than returning incorrect results.

- Issue #7909: Do not touch paths with the special prefixes ``\\.\``
  or ``\\?\`` in ntpath.normpath().

- Issue #5294: Fix the behavior of pdb's "continue" command when called
  in the top-level debugged frame.

- Issue #5727: Restore the ability to use readline when calling into pdb
  in doctests.

- Issue #6719: In pdb, do not stop somewhere in the encodings machinery
  if the source file to be debugged is in a non-builtin encoding.

- Issue #8048: Prevent doctests from failing when sys.displayhook has
  been reassigned.

- Issue #8015: In pdb, do not crash when an empty line is entered as
  a breakpoint command.

- Issue #5146: Handle UID THREAD command correctly in imaplib.

- Issue #5147: Fix the header generated for cookie files written by
  http.cookiejar.MozillaCookieJar.

- Issue #8198: In pydoc, output all help text to the correct stream
  when sys.stdout is reassigned.

- Issue #8230: Fix Lib/test/sortperf.py.

- Issue #7395: Fix tracebacks in pstats interactive browser.

- Issue #1713: Fix os.path.ismount(), which returned true for symbolic links
  across devices.

- Issue #8826: Properly load old-style "expires" attribute in http.cookies.

- Issue #1690103: Fix initial namespace for code run with trace.main().

- Issue #9354: Provide getsockopt() in asyncore's file_wrapper.

- Issue #9448: Fix a leak of OS resources (mutexes or semaphores) when
  re-initializing a buffered IO object by calling its ``__init__`` method.

- Issue #8620: when a Cmd is fed input that reaches EOF without a final
  newline, it no longer truncates the last character of the last command line.

- Issue #3704: http.cookiejar was not properly handling URLs with a / in the
  parameters.

- Issue #4629: getopt raises an error if an argument ends with = whereas getopt
  doesn't except a value (eg. --help= is rejected if getopt uses ['help='] long
  options).

- Issue #7895: platform.mac_ver() no longer crashes after calling os.fork()

- Issue #9323: Fixed a bug in trace.py that resulted in loosing the
  name of the script being traced.  Patch by Eli Bendersky.

- Issue #9282: Fixed --listfuncs option of trace.py.  Thanks Eli
  Bendersky for the patch.

- Issue #1555570: email no longer inserts extra blank lines when a \r\n
  combo crosses an 8192 byte boundary.

- Issue #9243: Fix sndhdr module and add unit tests, contributed by James Lee.

- Issue #9137: Fix issue in MutableMapping.update, which incorrectly
  treated keyword arguments called 'self' or 'other' specially.

- Issue #7646: The fnmatch pattern cache no longer grows without bound.

- Issue #9136: Fix 'dictionary changed size during iteration'
  RuntimeError produced when profiling the decimal module.  This was
  due to a dangerous iteration over 'locals()' in Context.__init__.

- Fix extreme speed issue in Decimal.pow when the base is an exact
  power of 10 and the exponent is tiny (for example,
  Decimal(10) ** Decimal('1e-999999999')).

- Issue #9130: Fix validation of relative imports in parser module.

- Issue #9128: Fix validation of class decorators in parser module.

- Issue #5468: urlencode to handle bytes type and other encodings in its query
  parameter. Patch by Dan Mahn.

- Issue #7673: Fix security vulnerability (CVE-2010-2089) in the audioop
  module, ensure that the input string length is a multiple of the frame size

- Issue #6589: cleanup asyncore.socket_map in case smtpd.SMTPServer constructor
  raises an exception.

- Issue #9075: In the ssl module, remove the setting of a ``debug`` flag
  on an OpenSSL structure.

- Issue #8682: The ssl module now temporary increments the reference count of
  a socket object got through ``PyWeakref_GetObject``, so as to avoid possible
  deallocation while the object is still being used.

- Issue #1368368: FancyURLOpener class changed to throw an Exception on wrong
  password instead of presenting an interactive prompt. Older behavior can be
  obtained by passing retry=True to http_error_xxx methods of FancyURLOpener.

- Issue #8203: Fix IDLE Credits dialog: view_file() uses its encoding argument.

- Issue #8720: fix regression caused by fix for #4050 by making getsourcefile
  smart enough to find source files in the linecache.

- Issue #5610: feedparser no longer eats extra characters at the end of
  a body part if the body part ends with a \r\n.

- Fix codecs.escape_encode to return the correct consumed size.

- Issue #8897: Fix sunau module, use bytes to write the header. Patch written
  by Thomas Jollans.

- Issue #6470: Drop UNC prefix in FixTk.

- Issue #4768: base64 encoded email body parts were incorrectly stored as
  binary strings.  They are now correctly converted to strings.

- Issue #8833: tarfile created hard link entries with a size field != 0 by
  mistake.

- Charset.body_encode now correctly handles base64 encoding by encoding
  with the output_charset before calling base64mime.encode.  Passes the
  tests from 2.x issue #1368247.

- Issue #7150: Raise OverflowError if the result of adding or subtracting
  timedelta from date or datetime falls outside of the MINYEAR:MAXYEAR range.

- Issue #4769: Fix main() function of the base64 module, use sys.stdin.buffer
  and sys.stdout.buffer (instead of sys.stdin and sys.stdout) to use the bytes
  API

- Issue #6662: Fix parsing of malformatted charref (&#bad;), patch written by
  Fredrik Håård

- Issue #6268: Fix seek() method of codecs.open(), don't read or write the BOM
  twice after seek(0). Fix also reset() method of codecs, UTF-16, UTF-32 and
  StreamWriter classes.

- Issue #8782: Add a trailing newline in linecache.updatecache to the last line
  of files without one.

- Issue #8729: Return NotImplemented from collections.Mapping.__eq__ when
  comparing to a non-mapping.

- Issue #8774: tabnanny uses the encoding cookie (#coding:...) to use the
  correct encoding

- Issue #7507: Quote "!" in pipes.quote(); it is special to some shells.

- Issue #8663: distutils.log emulates backslashreplace error handler. Fix
  compilation in a non-ASCII directory if stdout encoding is ASCII (eg. if
  stdout is not a TTY).

- Issue #1285086: Speed up urllib.parse functions: quote, quote_from_bytes,
  unquote, unquote_to_bytes.

- Issue #8688: Distutils now recalculates MANIFEST everytime.

- Issue #5099: subprocess.Popen.__del__ no longer references global objects
  to prevent issues during interpreter shutdown.

- Issue #8681: Make the zlib module's error messages more informative when
  the zlib itself doesn't give any detailed explanation.

- Issue #8674: Fixed a number of incorrect or undefined-behaviour-inducing
  overflow checks in the audioop module.

- Issue #8571: Fix an internal error when compressing or decompressing a
  chunk larger than 1GB with the zlib module's compressor and decompressor
  objects.

- Issue #8573: asyncore _strerror() function might throw ValueError.

- Issue #8483: asyncore.dispatcher's __getattr__ method produced confusing
  error messages when accessing undefined class attributes because of the cheap
  inheritance with the underlying socket object.

- Issue #7472: Fixed typo in email.encoders module; messages using ISO-2022
  character sets will now consistently use a Content-Transfer-Encoding of
  7bit rather than sometimes being marked as 8bit.

- Issue #4265: shutil.copyfile() was leaking file descriptors when disk fills.
  Patch by Tres Seaver.

- Issue #7755: Use an unencumbered audio file for tests.

- Issue #8621: uuid.uuid4() returned the same sequence of values in the
  parent and any children created using ``os.fork`` on MacOS X 10.6.

- Issue #8567: Fix precedence of signals in Decimal module: when a
  Decimal operation raises multiple signals and more than one of those
  signals is trapped, the specification determines the order in which
  the signals should be handled.  In many cases this order wasn't
  being followed, leading to the wrong Python exception being raised.

- Issue #7865: The close() method of :mod:`io` objects should not swallow
  exceptions raised by the implicit flush().  Also ensure that calling
  close() several times is supported.  Patch by Pascal Chambon.

- Issue #4687: Fix accuracy of garbage collection runtimes displayed with
  gc.DEBUG_STATS.

- Issue #8354: The siginterrupt setting is now preserved for all signals,
  not just SIGCHLD.

- Issue #8464: tarfile no longer creates files with execute permissions set
  when mode="w|" is used.

- Issue #7834: Fix connect() of Bluetooth L2CAP sockets with recent versions
  of the Linux kernel.  Patch by Yaniv Aknin.

- Issue #6312: Fixed http HEAD request when the transfer encoding is chunked.
  It should correctly return an empty response now.

- Issue #8549: Fix compiling the _ssl extension under AIX.  Patch by
  Sridhar Ratnakumar.

- Issue #8391: os.execvpe() and os.getenv() supports unicode with surrogates
  and bytes strings for environment keys and values, and use
  sys.getfilesystemencoding() instead of sys.getdefautltencoding()

- Issue #2302: Fix a race condition in SocketServer.BaseServer.shutdown,
  where the method could block indefinitely if called just before the
  event loop started running.  This also fixes the occasional freezes
  witnessed in test_httpservers.

- Issue #8524: When creating an SSL socket, the timeout value of the
  original socket wasn't retained (instead, a socket with a positive timeout
  would be turned into a non-blocking SSL socket).

- Issue #5103: SSL handshake would ignore the socket timeout and block
  indefinitely if the other end didn't respond.

- The do_handshake() method of SSL objects now adjusts the blocking mode of
  the SSL structure if necessary (as other methods already do).

- Issue #8108: Fix the unwrap() method of SSL objects when the socket has
  a non-infinite timeout.  Also make that method friendlier with applications
  wanting to continue using the socket in clear-text mode, by disabling
  OpenSSL's internal readahead.  Thanks to Darryl Miles for guidance.

- Issue #8468: bz2.BZ2File() accepts str with surrogates and bytes filenames

- Issue #8496: make mailcap.lookup() always return a list, rather than an
  iterator.  Patch by Gregory Nofi.

- Issue #8195: Fix a crash in sqlite Connection.create_collation() if the
  collation name contains a surrogate character.

- Issue #8484: Load all ciphers and digest algorithms when initializing
  the _ssl extension, such that verification of some SSL certificates
  doesn't fail because of an "unknown algorithm".

- Issue #4814: timeout parameter is now applied also for connections resulting
  from PORT/EPRT commands.

- Issue #3817: ftplib.FTP.abort() method now considers 225 a valid response
  code as stated in RFC-959 at chapter 5.4.

- Issue #8394: _ctypes.dlopen() accepts bytes, bytearray and str with
  surrogates.

- Issue #7606: XML-RPC traceback stored in X-traceback is now encoded to ASCII
  using backslashreplace error handler

- Issue #5277: Fix quote counting when parsing RFC 2231 encoded parameters.

- Issue #8383: pickle and pickletools use surrogatepass error handler when
  encoding unicode as utf8 to support lone surrogates and stay compatible with
  Python 2.x and 3.0

- Issue #8179: Fix macpath.realpath() on a non-existing path.

- Issue #8139: ossaudiodev didn't initialize its types properly, therefore
  some methods (such as oss_mixer_device.fileno()) were not available.
  Initial patch by Bertrand Janin.

- Issue #7512: shutil.copystat() could raise an OSError when the filesystem
  didn't support chflags() (for example ZFS under FreeBSD).  The error is
  now silenced.

- Issue #3890, #8222: Fix recv() and recv_into() on non-blocking SSL sockets.
  Also, enable the SSL_MODE_AUTO_RETRY flag on SSL sockets, so that blocking
  reads and writes are always retried by OpenSSL itself.

- Issue #6716/2: Backslash-replace error output in compilall.

Extension Modules
-----------------

- Issue #6317: Now winsound.PlaySound can accept non ascii filename.

- Issue #9054: Fix a crash occurring when using the pyexpat module
  with expat version 2.0.1.

- Issue #10003: Allow handling of SIGBREAK on Windows. Fixes a regression
  introduced by issue #9324.

- Issue #8734: Avoid crash in msvcrt.get_osfhandle() when an invalid file
  descriptor is provided.  Patch by Pascal Chambon.

- Issue #7736: Release the GIL around calls to opendir() and closedir()
  in the posix module.  Patch by Marcin Bachry.

- Issue #4835: make PyLong_FromSocket_t() and PyLong_AsSocket_t() private
  to the socket module, and fix the width of socket descriptors to be
  correctly detected under 64-bit Windows.

- Issue #665761: ``functools.reduce()`` will no longer mask exceptions
  other than ``TypeError`` raised by the iterator argument.

- Issue #9570: Use PEP 383 decoding in os.mknod and os.mkfifo.

- Issue #9324: Add parameter validation to signal.signal on Windows in order
  to prevent crashes.

- Issue #9526: Remove some outdated (int) casts that were preventing
  the array module from working correctly with arrays of more than
  2**31 elements.

- Fix memory leak in ssl._ssl._test_decode_cert.

- Issue #8065: Fix memory leak in readline module (from failure to
  free the result of history_get_history_state()).

- Issue #9450: Fix memory leak in readline.replace_history_item and
  readline.remove_history_item for readline version >= 5.0.

- Issue #8105: Validate file descriptor passed to mmap.mmap on Windows.

- Issue #9422: Fix memory leak when re-initializing a struct.Struct object.

- Issue #7900: The getgroups(2) system call on MacOSX behaves rather oddly
  compared to other unix systems. In particular, os.getgroups() does
  not reflect any changes made using os.setgroups() but basicly always
  returns the same information as the id command.

  os.getgroups() can now return more than 16 groups on MacOSX.

- Issue #7384: If the system readline library is linked against
  ncurses, do not link the readline module against ncursesw. The
  additional restriction of linking the readline and curses modules
  against the same curses library is currently not enabled.

- Issue #8973: Add __all__ to struct module; this ensures that
  help(struct) includes documentation for the struct.Struct class.

- Issue #2810: Fix cases where the Windows registry API returns
  ERROR_MORE_DATA, requiring a re-try in order to get the complete result.

Build
-----

- Issue #8852: Allow the socket module to build on OpenSolaris.

- Issue #10054: Some platforms provide uintptr_t in inttypes.h.  Patch by
  Akira Kitada.

- Issue #10055: Make json C89-compliant in UCS4 mode.

- Issue #6244: Allow detect_tkinter to look for Tcl/Tk 8.6.

- Issue #1633863: Don't ignore $CC under AIX.

- Issue #9810: Compile bzip2 source files in python's project file
  directly. It used to be built with bzip2's makefile.

- Issue #941346: Improve the build process under AIX and allow Python to
  be built as a shared library.  Patch by Sébastien Sablé.

- Issue #4026: Make the fcntl extension build under AIX.  Patch by Sébastien
  Sablé.

- Issue #3101: Helper functions _add_one_to_index_C() and
  _add_one_to_index_F() become _Py_add_one_to_index_C() and
  _Py_add_one_to_index_F(), respectively.

- Issue #9700: define HAVE_BROKEN_POSIX_SEMAPHORES under AIX 6.x.  Patch by
  Sébastien Sablé.

- Issue #3928: os.mknod() now available in Solaris, also.

- Issue #6716: Quote -x arguments of compileall in MSI installer.
  Exclude 2to3 tests from compileall.

- Issue #1628484: The Makefile doesn't ignore the CFLAGS environment
  variable anymore.  It also forwards the LDFLAGS settings to the linker
  when building a shared library.

- Issue #9701: The MacOSX installer can patch the shell profile to ensure that
  the "bin" directory inside the framework is on the shell's search path. This
  feature now also supports the ZSH shell.

- Issue #7473: avoid link errors when building a framework with a different
  set of architectures than the one that is currently installed.

Tests
-----

- Issue #3699: Fix test_bigaddrspace and extend it to test bytestrings
  as well as unicode strings.  Initial patch by Sandro Tosi.

- Issue #9628: fix runtests.sh -x option so more than one test can be excluded.

- Issue #9894: Do not hardcode ENOENT in test_subprocess.

- Issue #9315: Added tests for the trace module.  Patch by Eli Bendersky.

- Issue #7564: Skip test_ioctl if another process is attached to /dev/tty.

- Issue #8857: Provide a test case for socket.getaddrinfo.

- Issue #8433: Fix test_curses failure with newer versions of ncurses.

- Issue #9496: Provide a test suite for the rlcompleter module.  Patch by
  Michele Orrù.

- Issue #9251: test_threaded_import didn't fail when run through regrtest
  if the import lock was disabled.

- Issue #7449: Skip test_socketserver if threading support is disabled

- Issue #8672: Add a zlib test ensuring that an incomplete stream can be
  handled by a decompressor object without errors (it returns incomplete
  uncompressed data).

- Issue #8629: Disable some test_ssl tests, since they give different
  results with OpenSSL 1.0.0 and higher.

- Issue #8533: regrtest uses backslashreplace error handler for stdout to avoid
  UnicodeEncodeError (write non-ASCII character to stdout using ASCII encoding)

- Issue #8576: Remove use of find_unused_port() in test_smtplib and
  test_multiprocessing.  Patch by Paul Moore.

- Issue #8531: Skip test_ascii_formatd if ctypes module is missing

- Issue #3864: Skip three test_signal tests on freebsd6 because they fail
  if any thread was previously started, most likely due to a platform bug.

- Issue #8193: Fix test_zlib failure with zlib 1.2.4.

- Issue #9568: Fix test_urllib2_localnet on OS X 10.3.

Documentation
-------------

- Issue #9817: Add expat COPYING file; add expat, libffi and expat licenses
  to Doc/license.rst.

- Issue #9255: Document that the 'test' package is meant for interal Python use
  only.

- Issue #7829: Document in dis that bytecode is an implementation detail.

Tools/Demos
-----------

- Issue #7287: Demo/imputil/knee.py was removed.



What's New in Python 3.1.2?
===========================

*Release date: 2010-03-20*

Core and Builtins
-----------------

- Issue #7173: Generator finalization could invalidate sys.exc_info().

Library
-------

- Issue #2698: The --compiler ignored was ignored for distutils' build_ext.

- Issue #4961: Inconsistent/wrong result of askyesno function in tkMessageBox
  with Tcl/Tk-8.5.

- Issue #7356: ctypes.util: Make parsing of ldconfig output independent of
  the locale.


What's New in Python 3.1.2 release candidate 1?
===============================================

*Release date: 2010-03-06*

Core and Builtins
-----------------

- Issue #7544: Preallocate thread memory before creating the thread to avoid
  a fatal error in low memory condition.

- Issue #7820: The parser tokenizer restores all bytes in the right if
  the BOM check fails.

- Handle errors from looking up __prepare__ correctly.

- Issue #5939: Add additional runtime checking to ensure a valid capsule
  in Modules/_ctypes/callproc.c.

- Issue #7309: Fix unchecked attribute access when converting
  UnicodeEncodeError, UnicodeDecodeError, and UnicodeTranslateError to
  strings.

- Issue #6902: Fix problem with built-in types format incorrectly with
  0 padding.

- Issue #7988: Fix default alignment to be right aligned for
  complex.__format__. Now it matches other numeric types.

- Issue #7385: Fix a crash in `MemoryView_FromObject` when
  `PyObject_GetBuffer` fails.  Patch by Florent Xicluna.

- Issue #7788: Fix an interpreter crash produced by deleting a list
  slice with very large step value.

- Issue #7561: Operations on empty bytearrays (such as `int(bytearray())`)
  could crash in many places because of the PyByteArray_AS_STRING() macro
  returning NULL.  The macro now returns a statically allocated empty
  string instead.

- Issue #7632: Fix various str -> float conversion bugs present in 2.7
  alpha 2, including: (1) a serious 'wrong output' bug that could
  occur for long (> 40 digit) input strings, (2) a crash in dtoa.c
  that occurred in debug builds when parsing certain long numeric
  strings corresponding to subnormal values, (3) a memory leak for
  some values large enough to cause overflow, and (4) a number of
  flaws that could lead to incorrectly rounded results.

- Issue #7604: Deleting an unset slotted attribute did not raise an
  AttributeError.

- Issue #7466: segmentation fault when the garbage collector is called
  in the middle of populating a tuple.  Patch by Florent Xicluna.

- Issue #7419: setlocale() could crash the interpreter on Windows when called
  with invalid values.

- Issue #6077: On Windows, files opened with tempfile.TemporaryFile in "wt+"
  mode would appear truncated on the first '0x1a' byte (aka. Ctrl+Z).

- Issue #7085: Fix crash when importing some extensions in a thread
  on MacOSX 10.6.

- Issue #7298: fixes for range and reversed(range(...)).  Iteration
  over range(a, b, c) incorrectly gave an empty iterator when a, b and
  c fit in C long but the length of the range did not.  Also fix
  several cases where reversed(range(a, b, c)) gave wrong results, and
  fix a refleak for reversed(range(a, b, c)) with large arguments.

- Issue #7244: itertools.izip_longest() no longer ignores exceptions
  raised during the formation of an output tuple.

- Issue #3297: On wide unicode builds, do not split unicode characters into
  surrogates.

- Issue #1722344: threading._shutdown() is now called in Py_Finalize(), which
  fixes the problem of some exceptions being thrown at shutdown when the
  interpreter is killed. Patch by Adam Olsen.

- Issue #7065: Fix a crash in bytes.maketrans and bytearray.maketrans when
  using byte values greater than 127.  Patch by Derk Drukker.

- Issue #7019: Raise ValueError when unmarshalling bad long data, instead
  of producing internally inconsistent Python longs.

- Issue #6990: Fix threading.local subclasses leaving old state around
  after a reference cycle GC which could be recycled by new locals.

- Issue #6846: Fix bug where bytearray.pop() returns negative integers.

- Issue #6750: A text file opened with io.open() could duplicate its output
  when writing from multiple threads at the same time.

Library
-------

- Issue #7154: urllib.request can now detect the proxy settings on OSX 10.6
  (as long as the user didn't specify 'automatic proxy configuration').

- Issue #8412: os.system() now accepts bytes, bytearray and str with
  surrogates.

- Issue #4282: Fix the main function of the profile module for a non-ASCII
  script, open the file in binary mode and not in text mode with the default
  (utf8) encoding.

- Issue #7774: Set sys.executable to an empty string if argv[0] has been set to
  an non existent program name and Python is unable to retrieve the real
  program name

- Issue #6509: fix re.sub to work properly when the pattern, the string, and
  the replacement were all bytes. Patch by Antoine Pitrou.

- Issue #1054943: Fix unicodedata.normalize('NFC', text) for the Public Review
  Issue #29

- Issue #7494: fix a crash in _lsprof (cProfile) after clearing the profiler,
  reset also the pointer to the current pointer context.

- Issue #7250: Fix info leak of os.environ across multi-run uses of
  wsgiref.handlers.CGIHandler.

- Issue #1729305: Fix doctest to handle encode error with "backslashreplace".

- Issue #691291: codecs.open() should not convert end of lines on reading and
  writing.

- Issue #7959: ctypes callback functions are now registered correctly
  with the cycle garbage collector.

- Issue #6666: fix bug in trace.py that applied the list of directories
  to be ignored only to the first file.  Noted by Bogdan Opanchuk.

- Issue #7597: curses.use_env() can now be called before initscr().
  Noted by Kan-Ru Chen.

- Issue #7310: fix the __repr__ of os.environ to show the environment variables.

- Issue #7970: email.Generator.flatten now correctly flattens message/rfc822
  messages parsed by email.Parser.HeaderParser.

- Issue #7361: Importlib was not handling bytecode files less than 8 bytes in
  length properly.

- Issue #7835: shelve should no longer produce mysterious warnings during
  interpreter shutdown.

- Issue #6233: ElementTree failed converting unicode characters to XML
  entities when they could't be represented in the requested output
  encoding.  Patch by Jerry Chen.

- Issue #4772: Raise a ValueError when an unknown Bluetooth protocol is
  specified, rather than fall through to AF_PACKET (in the `socket` module).
  Also, raise ValueError rather than TypeError when an unknown TIPC address
  type is specified.  Patch by Brian Curtin.

- Issue #6939: Fix file I/O objects in the `io` module to keep the original
  file position when calling `truncate()`.  It would previously change the
  file position to the given argument, which goes against the tradition of
  ftruncate() and other truncation APIs.  Patch by Pascal Chambon.

- Issue #7792: Registering non-classes to ABCs raised an obscure error.

- Issue #7785: Don't accept bytes in FileIO.write().

- Issue #7773: Fix an UnboundLocalError in platform.linux_distribution() when
  the release file is empty.

- Issue #7561: Fix crashes when using bytearray objects with the posix
  module.

- Issue #1670765: Prevent email.generator.Generator from re-wrapping
  headers in multipart/signed MIME parts, which fixes one of the sources of
  invalid modifications to such parts by Generator.

- Issue #7701: Fix crash in binascii.b2a_uu() in debug mode when given a
  1-byte argument.  Patch by Victor Stinner.

- Issue #3299: Fix possible crash in the _sre module when given bad
  argument values in debug mode.  Patch by Victor Stinner.

- Issue #7681: Use floor division in appropiate places in the wave module.

- Issue #5372: Drop the reuse of .o files in Distutils' ccompiler (since
  Extension extra options may change the output without changing the .c
  file). Initial patch by Collin Winter.

- Issue #7617: Make sure distutils.unixccompiler.UnixCCompiler recognizes
  gcc when it has a fully qualified configuration prefix. Initial patch
  by Arfrever.

- Issue #7105: Make WeakKeyDictionary and WeakValueDictionary robust against
  the destruction of weakref'ed objects while iterating.

- Issue #7455: Fix possible crash in cPickle on invalid input.  Patch by
  Victor Stinner.

- Issue #6511: ZipFile now raises BadZipfile (instead of an IOError) when
  opening an empty or very small file.

- Issue #7556: Make sure Distutils' msvc9compile reads and writes the
  MSVC XML Manifest file in text mode so string patterns can be used
  in regular expressions.

- Issue #7552: Removed line feed in the base64 Authorization header in
  the Distutils upload command to avoid an error when PyPI reads it.
  This occurs on long passwords. Initial patch by JP St. Pierre.

- Issue #7231: urllib2 cannot handle https with proxy requiring auth.  Patch by
  Tatsuhiro Tsujikawa.

- Issue #4757: `zlib.compress` and other methods in the zlib module now
  raise a TypeError when given an `str` object (rather than a `bytes`-like
  object).  Patch by Victor Stinner and Florent Xicluna.

- Issue #7349: Make methods of file objects in the io module accept None as an
  argument where file-like objects (ie StringIO and BytesIO) accept them to mean
  the same as passing no argument.

- Issue #5949: added check for correct lineends in input from IMAP server
  in imaplib.

- Fix variations of extending deques:  d.extend(d)  d.extendleft(d)  d+=d

- Issue #6986: Fix crash in the JSON C accelerator when called with the
  wrong parameter types.  Patch by Victor Stinner.

- Issue #1923: Fixed the removal of meaningful spaces when PKG-INFO is
  generated in Distutils. Patch by Stephen Emslie.

- Issue #4120: Drop reference to CRT from manifest when building extensions with
  msvc9compiler.

- Issue #7410: deepcopy of itertools.count was resetting the count.

- Issue #4486: When an exception has an explicit cause, do not print its
  implicit context too.  This affects the `traceback` module as well as
  built-in exception printing.

- Issue #1488943: difflib.Differ() doesn't always add hints for tab characters

- Issue #7354: distutils.tests.test_msvc9compiler - dragfullwindows can
  be 2.

- Issue #3976: pprint for sets, frozensets, and dicts now succeed when
  they contain unorderable types.

- Issue #5037: Proxy the __bytes__ special method instead to __bytes__ instead
  of __str__.

- Issue #7341: Close the internal file object in the TarFile constructor in
  case of an error.

- Issue #7293: distutils.test_msvc9compiler is fixed to work on any fresh
  Windows box. Help provided by David Bolen.

- Issue #7328: pydoc no longer corrupts sys.path when run with the '-m' switch

- Issue #7318: multiprocessing now uses a timeout when it fails to establish
  a connection with another process, rather than looping endlessly. The
  default timeout is 20 seconds, which should be amply sufficient for
  local connections.

- Issue #7282: Fix a memory leak when an RLock was used in a thread other
  than those started through `threading.Thread` (for example, using
  `_thread.start_new_thread()`).

- Issue #7187: Importlib would not silence the IOError raised when trying to
  write new bytecode when it was made read-only.

- Issue #7264: Fix a possible deadlock when deallocating thread-local objects
  which are part of a reference cycle.

- Issue #6896: mailbox.Maildir now invalidates its internal cache each time
  a modification is done through it.  This fixes inconsistencies and test
  failures on systems with slightly bogus mtime behaviour.

- Issue #6665: Fix fnmatch to properly match filenames with newlines in them.

- Issue #7246 & Issue #7208: getpass now properly flushes input before
  reading from stdin so that existing input does not confuse it and
  lead to incorrect entry or an IOError.  It also properly flushes it
  afterwards to avoid the terminal echoing the input afterwards on
  OSes such as Solaris.

- Issue #7233: Fix a number of two-argument Decimal methods to make
  sure that they accept an int or long as the second argument.  Also
  fix buggy handling of large arguments (those with coefficient longer
  than the current precision) in shift and rotate.

- Issue #7205: Fix a possible deadlock when using a BZ2File object from
  several threads at once.

- Issue #7071: byte-compilation in Distutils is now done with respect to
  sys.dont_write_bytecode.

- Issue #7099: Decimal.is_normal now returns True for numbers with exponent
  larger than emax.

- Issue #7080: locale.strxfrm() raises a MemoryError on 64-bit non-Windows
  platforms, and assorted locale fixes by Derk Drukker.

- Issue #5833: Fix extra space character in readline completion with the
  GNU readline library version 6.0.

- Issue #6894: Fixed the issue urllib2 doesn't respect "no_proxy" environment

- Issue #7082: When falling back to the MIME 'name' parameter, the
  correct place to look for it is the Content-Type header.

- Make tokenize.detect_coding() normalize utf-8 and iso-8859-1 variants like the
  builtin tokenizer.

- Issue #7048: Force Decimal.logb to round its result when that result
  is too large to fit in the current precision.

- Issue #6236, #6348: Fix various failures in the I/O library under AIX
  and other platforms, when using a non-gcc compiler. Patch by Derk Drukker.

- Issue #6954: Fixed crash when using DISTUTILS_DEBUG flag in Distutils.

- Issue #4606: Passing 'None' if ctypes argtype is set to POINTER(...)
  does now always result in NULL.

- Issue #5042: Structure sub-subclass does now initialize correctly
  with base class positional arguments.

- Issue #6882: Import uuid creates zombies processes.

- Issue #6635: Fix profiler printing usage message.

- Issue #6888: pdb's alias command was broken when no arguments were given.

- Issue #6795: int(Decimal('nan')) now raises ValueError instead of
  returning NaN or raising InvalidContext.  Also, fix infinite recursion
  in long(Decimal('nan')).

- Issue #6850: Fix bug in Decimal._parse_format_specifier for formats
  with no type specifier.

- Issue #6239: ctypes.c_char_p return value must return bytes.

- Issue #6838: Use a list to accumulate the value instead of
  repeatedly concatenating strings in http.client's
  HTTPResponse._read_chunked providing a significant speed increase
  when downloading large files servend with a Transfer-Encoding of 'chunked'.

- Have importlib raise ImportError if None is found in sys.modules for a
  module.

- Issue #6794: Fix Decimal.compare_total and Decimal.compare_total_mag: NaN
  payloads are now ordered by integer value rather than lexicographically.

- Issue #6163: Fixed HP-UX runtime library dir options in
  distutils.unixcompiler. Initial patch by Sridhar Ratnakumar and
  Michael Haubenwallner.

- Issue #7066: archive_util.make_archive now restores the cwd if an error is
  raised. Initial patch by Ezio Melotti.

- Issue #7481: When a threading.Thread failed to start it would leave the
  instance stuck in initial state and present in threading.enumerate().

- Issue #1068268: The subprocess module now handles EINTR in internal
  os.waitpid and os.read system calls where appropriate.

- Issue #9315: Fix for the trace module to record correct class name
  for tracing methods.

Extension Modules
-----------------

- Issue #9277: Fix bug in struct.pack for bools in standard mode
  (e.g., struct.pack('>?')):  if conversion to bool raised an exception
  then that exception wasn't properly propagated on machines where
  char is unsigned.

- Issue #5180: Fixed a bug that prevented loading 2.x pickles in 3.x
  python when they contain instances of old-style classes.

- Issue #7670: sqlite3: Fixed crashes when operating on closed connections.

- Stop providing crtassem.h symbols when compiling with Visual Studio 2010, as
  msvcr100.dll is not a platform assembly anymore.

- Issue #7078: Set struct.__doc__ from _struct.__doc__.

- Issue #6848: Fix curses module build failure on OS X 10.6.

- Expat: Fix DoS via XML document with malformed UTF-8 sequences
  (CVE_2009_3560).

- Issue #7999: os.setreuid() and os.setregid() would refuse to accept a -1
  parameter on some platforms such as OS X.

Tests
-----

- Issue #7924: Fix an intermittent 'XXX undetected error' failure in
  test_capi (only seen so far on platforms where the curses module
  wasn't built), due to an uncleared exception.

- issue #7728: test_timeout was changed to use test.support.bind_port
  instead of a hard coded port.

- Issue #7376: instead of running a self-test (which was failing) when called
  with no arguments, doctest.py now gives a usage message.

- Issue #7498: test_multiprocessing now uses test.support.find_unused_port
  instead of a hardcoded port number in test_rapid_restart.

- Issue #7431: use TESTFN in test_linecache instead of trying to create a
  file in the Lib/test directory, which might be read-only for the
  user running the tests.

- Issue #7324: add a sanity check to regrtest argument parsing to
  catch the case of an option with no handler.

- Issue #6551: test_zipimport could import and then destroy some modules of
  the encodings package, which would make other tests fail further down
  the road because the internally cached encoders and decoders would point
  to empty global variables.

- Issue #7295: Do not use a hardcoded file name in test_tarfile.

- Issue #7270: Add some dedicated unit tests for multi-thread synchronization
  primitives such as Lock, RLock, Condition, Event and Semaphore.

- Issue #7248 (part 2): Use a unique temporary directory for importlib source
  tests instead of tempfile.tempdir. This prevents the tests from sharing state
  between concurrent executions on the same system.

- Issue #7248: In importlib.test.source.util a try/finally block did not make
  sure that some referenced objects actually were created in the block before
  calling methods on the object.

- Issue #7055: test___all__ now greedily detects all modules which have an
  __all__ attribute, rather than using a hardcoded and incomplete list.

- Issue #7058: Added save/restore for argv and os.environ to runtest_inner
  in regrtest, with warnings if the called test modifies them.

- Issue #7042: Fix test_signal (test_itimer_virtual) failure on OS X 10.6.

C-API
-----

- Make PyUnicode_CompareWithASCIIString return not equal if the Python string
  has '\0' at the end.

- Issue #7414: 'C' code wasn't being skipped properly (for keyword arguments)
  in PyArg_ParseTupleAndKeywords.

Build
-----

- Issue #9280: Make sharedinstall depend on sharedmods.

- Issue #8854: Fix finding Visual Studio 2008 on Windows x64.

- Issue #3920, #7903: Define _BSD_SOURCE on OpenBSD 4.4 through 4.9.

- Issue #7632: When Py_USING_MEMORY_DEBUGGER is defined, disable the
  private memory allocation scheme in dtoa.c and use PyMem_Malloc and
  PyMem_Free instead.  Also disable caching of powers of 5.

- Switch to OpenSSL 0.9.8l on Windows.

- Issue #6603: Change READ_TIMESTAMP macro in ceval.c so that it
  compiles correctly under gcc on x86-64.  This fixes a reported
  problem with the --with-tsc build on x86-64.

- Issue #6802: Fix build issues on MacOSX 10.6

- Issue #6801 : symmetric_difference_update also accepts |.
  Thanks to Carl Chenet.

- Issue #7541: when using ``python-config`` with a framework install the
  compiler might use the wrong library.

- Issue #6491: Allow --with-dbmliborder to specify that no dbms will be built.

- Issue #7589: Only build the nis module when the correct header files are
  found.

Documentation
-------------

- Updating `Using Python` documentation to include description of CPython's
  -J and -X options.

- Issue #6556: Fixed the Distutils configuration files location explanation
  for Windows.

- Update python manual page (options -B, -O0, -s, environment variables
  PYTHONDONTWRITEBYTECODE, PYTHONNOUSERSITE).

- Issue #8909: Added the size of the bitmap used in the installer created by
  distutils' bdist_wininst. Patch by Anatoly Techtonik.


What's New in Python 3.1.1?
===========================

*Release date: 2009-08-13*

Core and Builtins
-----------------

- Issue #6707: dir() on an uninitialized module caused a crash.

- Issue #6540: Fixed crash for bytearray.translate() with invalid parameters.

- Issue #6573: set.union() stopped processing inputs if an instance of self
  occurred in the argument chain.

- Issue #6070: On posix platforms import no longer copies the execute bit
  from the .py file to the .pyc file if it is set.

- Issue #6428: Since Python 3.0, the __bool__ method must return a bool
  object, and not an int.  Fix the corresponding error message, and the
  documentation.

- Issue #6347: Include inttypes.h as well as stdint.h in pyport.h.
  This fixes a build failure on HP-UX: int32_t and uint32_t are
  defined in inttypes.h instead of stdint.h on that platform.

- Issue #6373: Fixed a SystemError when encoding with the latin-1 codec and
  the 'surrogateescape' error handler, a string which contains unpaired
  surrogates.

C-API
-----

- Issue #6624: yArg_ParseTuple with "s" format when parsing argument with
  NUL: Bogus TypeError detail string.

- Issue #6405: Remove duplicate type declarations in descrobject.h.

- The code flags for old __future__ features are now available again.

Library
-------

- Issue #6106: telnetlib.Telnet.process_rawq doesn't handle default WILL/WONT
  DO/DONT correctly.

- Issue #6126: Fixed pdb command-line usage.

- Issue #6629: Fix a data corruption issue in the new I/O library, which could
  occur when writing to a BufferedRandom object (e.g. a file opened in "rb+" or
  "wb+" mode) after having buffered a certain amount of data for reading. This
  bug was not present in the pure Python implementation.

- Issue #6622: Fix "local variable 'secret' referenced before
  assignment" bug in POP3.apop.

- Issue #6637: defaultdict.copy() did not work when the default factory
  was left unspecified.  Also, the eval/repr round-trip would fail when
  the default_factory was None.

- Issue #2715: Remove remnants of Carbon.File from binhex module.

- Issue #6595: The Decimal constructor now allows arbitrary Unicode
decimal digits in input, as recommended by the standard.  Previously
it was restricted to accepting [0-9].

- Issues #5155, #5313, #5331: multiprocessing.Process._bootstrap was
unconditionally calling "os.close(sys.stdin.fileno())" resulting in file
descriptor errors

- Issue #1424152: Fix for http.client, urllib.request to support SSL while
working through proxy. Original patch by Christopher Li, changes made by
Senthil Kumaran

- importlib.abc.PyLoader did not inherit from importlib.abc.ResourceLoader like
the documentation said it did even though the code in PyLoader relied on the
abstract method required by ResourceLoader.

- Issue #6431: Make Fraction type return NotImplemented when it doesn't
know how to handle a comparison without loss of precision.  Also add
correct handling of infinities and nans for comparisons with float.

- Issue #6415: Fixed warnings.warn segfault on bad formatted string.

- Issue #6358: The exit status of a command started with os.popen() was
reported differently than it did with python 2.x.

- Issue #6323: The pdb debugger did not exit when running a script with a
syntax error.

- Issue #3392: The subprocess communicate() method no longer fails in select()
  when file descriptors are large; communicate() now uses poll() when possible.

- Issue #6369: Fix an RLE decompression bug in the binhex module.

- Issue #6344: Fixed a crash of mmap.read() when passed a negative argument.

- Issue #4005: Fixed a crash of pydoc when there was a zip file present in
  sys.path.

Extension Modules
-----------------

- Fix a segfault in expat.

- Issue #4509: array.array objects are no longer modified after an operation
  failing due to the resize restriction in-place when the object has exported
  buffers.

Build
-----

- Issue #4601: 'make install' did not set the appropriate permissions on
directories.

- Issue #5390: Add uninstall icon independent of whether file
extensions are installed.

Test
----

- Fix a test in importlib.test.source.test_abc_loader that was incorrectly
testing when a .pyc file lacked an code object bytecode.


What's New in Python 3.1?
=========================

*Release date: 27-June-2009*

Core and Builtins
-----------------

- Issue #6334: Fix bug in range length calculation for ranges with
large arguments.

- Issue #6329: Fixed iteration for memoryview objects (it was being blocked
because it wasn't recognized as a sequence).

Library
-------

- Issue #6314: logging.basicConfig() performs extra checks on the "level"
argument.

- Issue #6274: Fixed possible file descriptors leak in subprocess.py

- Accessing io.StringIO.buffer now raises an AttributeError instead of
io.UnsupportedOperation.

- Issue #6271: mmap tried to close invalid file handle (-1) when anonymous.
(On Unix)

- Issue #1202: zipfile module would cause a struct.error when attempting to
store files with a CRC32 > 2**31-1.

Extension Modules
-----------------

- Issue #5590: Remove unused global variable in pyexpat extension.


What's New in Python 3.1 Release Candidate 2?
=============================================

*Release date: 13-June-2009*

Core and Builtins
-----------------

- Fixed SystemError triggered by "range([], 1, -1)".

- Issue #5924: On Windows, a large PYTHONPATH environment variable
(more than 255 characters) would be completely ignored.

- Issue #4547: When debugging a very large function, it was not always
possible to update the lineno attribute of the current frame.

- Issue #5330: C functions called with keyword arguments were not reported by
  the various profiling modules (profile, cProfile). Patch by Hagen Fürstenau.

Library
-------

- Issue #6438: Fixed distutils.cygwinccompiler.get_versions : the regular
expression string pattern was trying to match against a bytes returned by
Popen. Tested under win32 to build the py-postgresql project.

- Issue #6258: Support AMD64 in bdist_msi.

- Issue #6195: fixed doctest to no longer try to read 'source' data from
binary files.

- Issue #5262: Fixed bug in next rollover time computation in
TimedRotatingFileHandler.

- Issue #6217: The C implementation of io.TextIOWrapper didn't include the
errors property.  Additionally, the errors and encoding properties of StringIO
are always None now.

- Issue #6137: The pickle module now translates module names when loading
or dumping pickles with a 2.x-compatible protocol, in order to make data
sharing and migration easier. This behaviour can be disabled using the
new `fix_imports` optional argument.

- Removed the ipaddr module.

- Issue #3613: base64.{encode,decode}string are now called
base64.{encode,decode}bytes which reflects what type they accept and return.
The old names are still there as deprecated aliases.

- Issue #5767: Remove sgmlop support from xmlrpc.client.

- Issue #6150: Fix test_unicode on wide-unicode builds.

- Issue #6149: Fix initialization of WeakValueDictionary objects from non-empty
parameters.

Windows
-------

- Issue #6221: Delete test registry key before running the test.

- Issue #6158: Package Sine-1000Hz-300ms.aif in MSI file.

C-API
-----

- Issue #5735: Python compiled with --with-pydebug should throw an
  ImportError when trying to import modules compiled without
  --with-pydebug, and vice-versa.


Build
-----

- Issue #6154: Make sure the intl library is added to LIBS if needed. Also
  added LIBS to OS X framework builds.

- Issue #5809: Specifying both --enable-framework and --enable-shared is
  an error. Configure now explicity tells you about this.



What's New in Python 3.1 release candidate 1?
=============================================

*Release date: 2009-05-30*

Core and Builtins
-----------------

- Issue #6097: Escape UTF-8 surrogates resulting from mbstocs conversion
  of the command line.

- Issue #6012: Add cleanup support to O& argument parsing.

- Issue #6089: Fixed str.format with certain invalid field specifiers
  that would raise SystemError.

- Issue #5982: staticmethod and classmethod now expose the wrapped
  function with __func__.

- Added support for multiple context managers in the same with-statement.
  Deprecated contextlib.nested() which is no longer needed.

- Issue #5829: complex("1e500") no longer raises OverflowError.  This
  makes it consistent with float("1e500") and interpretation of real
  and imaginary literals.

- Issue #3527: Removed Py_WIN_WIDE_FILENAMES which is not used any more.

- Issue #5994: the marshal module now has docstrings.

- Issue #5981: Fix three minor inf/nan issues in float.fromhex:
  (1) inf and nan strings with trailing whitespace were incorrectly
  rejected;  (2) parsing of strings representing infinities and nans
  was locale aware; and (3) the interpretation of fromhex('-nan')
  didn't match that of float('-nan').

Library
-------

- Issue #4859: Implement PEP 383 for pwd, spwd, and grp.

- smtplib 'login' and 'cram-md5' login are also fixed (see Issue #5259).

- Issue #6121: pydoc now ignores leading and trailing spaces in the
  argument to the 'help' function.

- Issue #6118: urllib.parse.quote_plus ignored the encoding and errors
  arguments for strings with a space in them.

- collections.namedtuple() was not working with the following field
  names:  cls, self, tuple, itemgetter, and property.

- In unittest, using a skipping decorator on a class is now equivalent to
  skipping every test on the class.  The ClassTestSuite class has been removed.

- Issue #6050: Don't fail extracting a directory from a zipfile if
  the directory already exists.

- Issue #1309352: fcntl now converts its third arguments to a C `long` rather
  than an int, which makes some operations possible under 64-bit Linux (e.g.
  DN_MULTISHOT with F_NOTIFY).

- Issue #5761: Add the name of the underlying file to the repr() of various
  IO objects.

- Issue #5259: smtplib plain auth login no longer gives a traceback.  Fix
  by Musashi Tamura, tests by Marcin Bachry.

- Issue #1983: Fix functions taking or returning a process identifier to use
  the dedicated C type ``pid_t`` instead of a C ``int``. Some platforms have
  a process identifier type wider than the standard C integer type.

- Issue #4066: smtplib.SMTP_SSL._get_socket now correctly returns the socket.
  Patch by Farhan Ahmad, test by Marcin Bachry.

- Issue #2116: Weak references and weak dictionaries now support copy()ing and
  deepcopy()ing.

- Issue #1655: Make imaplib IPv6-capable. Patch by Derek Morr.

- Issue #5918: Fix a crash in the parser module.

- Issue #1664: Make nntplib IPv6-capable. Patch by Derek Morr.

- Issue #5006: Better handling of unicode byte-order marks (BOM) in the io
  library. This means, for example, that opening an UTF-16 text file in
  append mode doesn't add a BOM at the end of the file if the file isn't
  empty.

- Issue #4050: inspect.findsource/getsource now raise an IOError if the 'source'
  file is a binary.  Patch by Brodie Rao, tests by Daniel Diniz.  This fix
  corrects a pydoc regression.

- Issue #5955: aifc's close method did not close the file it wrapped,
  now it does.  This also means getfp method now returns the real fp.

Installation
------------

- Issue #6047: fullinstall has been removed because Python 3's executable will
  now be known as python3.

- Lib/smtpd.py is no longer installed as a script.

Extension Modules
-----------------

- Issue #3061: Use wcsftime for time.strftime where available.

- Issue #4873: Fix resource leaks in error cases of pwd and grp.

- Issue #6093: Fix off-by-one error in locale.strxfrm.

- The _functools and _locale modules are now built into the libpython shared
  library instead of as extension modules.

Build
-----

- Issue #3585: Add pkg-config support. It creates a python-2.7.pc file
  and a python3.pc symlink in the $(LIBDIR)/pkgconfig directory. Patch by
  Clinton Roy.

Tests
-----

- Issue #5442: Tests for importlib were not properly skipping case-sensitivity
  tests on darwin even when the OS was installed on a case-sensitive
  filesystem. Also fixed tests that should not be run when
  sys.dont_write_bytecode is true.


What's New in Python 3.1 beta 1?
================================

*Release date: 2009-05-06*

Core and Builtins
-----------------

- Issue #5914: Add new C API function PyOS_string_to_double, and
  deprecate PyOS_ascii_strtod and PyOS_ascii_atof.

- Issue #3382: float.__format__, complex.__format__, and %-formatting
  no longer map 'F' to 'f'. Because of issue #5859 (below), this only
  affects nan -> NAN and inf -> INF.

- Issue #5799: ntpath (ie, os.path on Windows) fully supports UNC pathnames
  in all operations, including splitdrive, split, etc.  splitunc() now issues
  a PendingDeprecation warning.

- Issue #5920: For float.__format__, change the behavior with the
  empty presentation type (that is, not one of 'e', 'f', 'g', or 'n')
  to be like 'g' but with at least one decimal point and with a
  default precision of 12. Previously, the behavior the same but with
  a default precision of 6.  This more closely matches str(), and
  reduces surprises when adding alignment flags to the empty
  presentation type. This also affects the new complex.__format__ in
  the same way.

- Implement PEP 383, Non-decodable Bytes in System Character Interfaces.

- Issue #5890: in subclasses of 'property' the __doc__ attribute was
  shadowed by classtype's, even if it was None.  property now
  inserts the __doc__ into the subclass instance __dict__.

- Issue #4426: The UTF-7 decoder was too strict and didn't accept some legal
  sequences. Patch by Nick Barnes and Victor Stinner.

- Issue #3672: Reject surrogates in utf-8 codec; add surrogatepass error handler.

- Issue #5883: In the io module, the BufferedIOBase and TextIOBase ABCs have
  received a new method, detach().  detach() disconnects the underlying stream
  from the buffer or text IO and returns it.

- Issue #5859: Remove switch from '%f' to '%g'-style formatting for
  floats with absolute value over 1e50.  Also remove length
  restrictions for float formatting: '%.67f' % 12.34 and '%.120e' %
  12.34 no longer raise an exception.

- Issue #1588: Add complex.__format__. For example,
  format(complex(1, 2./3), '.5') now produces a sensible result.

- Issue #5864: Fix empty format code formatting for floats so that it
  never gives more than the requested number of significant digits.

- Issue #5793: Rationalize isdigit / isalpha / tolower, etc. Includes
  new Py_ISDIGIT / Py_ISALPHA / Py_TOLOWER, etc. in pctypes.h.

- Issue #5835: Deprecate PyOS_ascii_formatd.

- Issue #4971: Fix titlecase for characters that are their own
  titlecase, but not their own uppercase.

- Issue #5283: Setting __class__ in __del__ caused a segfault.

- Issue #5816: complex(repr(z)) now recovers z exactly, even when
  z involves nans, infs or negative zeros.

- Issue #3166: Make int -> float conversions correctly rounded.

- Issue #1869 (and many duplicates): make round(x, n) correctly
  rounded for a float x, by using the decimal <-> binary conversions
  from Python/dtoa.c.  As a consequence, (e.g.) round(x, 2) now
  consistently agrees with format(x, '.2f').

- Issue #5787: object.__getattribute__(some_type, "__bases__") segfaulted on
  some builtin types.

- Issue #5772: format(1e100, '<') produces '1e+100', not '1.0e+100'.

- Issue #5515: str.format() type 'n' combined with commas and leading
  zeros no longer gives odd results with ints and floats.

- Implement PEP 378, Format Specifier for Thousands Separator, for
  floats.

- The str function switches to exponential notation at
  1e11, not 1e12.  This avoids printing 13 significant digits in
  situations where only 12 of them are correct.  Example problem
  value: str(1e11 + 0.5).  (This minor issue has existed in 2.x for a
  long time.)

- Issue #1580: On most platforms, use a 'short' float repr: for a
  finite float x, repr(x) now outputs a string based on the shortest
  sequence of decimal digits that rounds to x.  Previous behaviour was
  to output 17 significant digits and then strip trailing zeros.
  Another minor difference is that the new repr switches to
  exponential notation at 1e16 instead of the previous 1e17; this
  avoids misleading output in some cases.

  There's a new sys attribute sys.float_repr_style, which takes
  the value 'short' to indicate that we're using short float repr,
  and 'legacy' if the short float repr isn't available for one
  reason or another.

  The float repr change involves incorporating David Gay's 'perfect
  rounding' code into the Python core (it's in Python/dtoa.c).  As a
  secondary consequence, all string-to-float and float-to-string
  conversions (including all float formatting operations) will be
  correctly rounded on these platforms.

  See issue #1580 discussions for details of platforms for which
  this change does not apply.

- Issue #5759: float() didn't call __float__ on str subclasses.

- The string.maketrans() function is deprecated; there is a new static method
  maketrans() on the bytes and bytearray classes.  This removes confusion about
  the types string.maketrans() is supposed to work with, and mirrors the
  methods available on the str class.

- Issue #2170: refactored xml.dom.minidom.normalize, increasing both
  its clarity and its speed.

- Issue #1113244: Py_XINCREF, Py_DECREF, Py_XDECREF: Add `do { ... } while (0)'
  to avoid compiler warnings.

- Issue #3739: The unicode-internal encoder now reports the number of characters
  consumed like any other encoder (instead of the number of bytes).

Installation
------------

- Issue #5756: Install idle and pydoc with a 3 suffix.

Library
-------

- Issue #5311: bdist_msi can now build packages that do not depend on a
  specific Python version.

- Issue #5150: IDLE's format menu now has an option to strip trailing
  whitespace.

- Issue #5940: distutils.command.build_clib.check_library_list was not doing
  the right type checkings anymore.

- Issue #4875: On win32, ctypes.util.find_library does no longer
  return directories.

- Issue #5142: Add the ability to skip modules while stepping to pdb.

- Issue #1309567: Fix linecache behavior of stripping subdirectories when
  looking for files given by a relative filename.

- Issue #5923: Update the ``turtle`` module to version 1.1, add two new
  turtle demos in Demo/turtle.

- Issue #5692: In :class:`zipfile.Zipfile`, fix wrong path calculation when
  extracting a file to the root directory.

- Issue #5913: os.listdir() should fail for empty path on windows.

- Issue #5084: unpickling now interns the attribute names of pickled objects,
  saving memory and avoiding growth in size of subsequent pickles. Proposal
  and original patch by Jake McGuire.

- The json module now works exclusively with str and not bytes.

- Issue #3959: The ipaddr module has been added to the standard library.
  Contributed by Google.

- Issue #3002: ``shutil.copyfile()`` and ``shutil.copytree()`` now raise an
  error when a named pipe is encountered, rather than blocking infinitely.

- Issue #5857: tokenize.tokenize() now returns named tuples.

- Issue #4305: ctypes should now build again on mipsel-linux-gnu

- Issue #1734234: Massively speedup ``unicodedata.normalize()`` when the
  string is already in normalized form, by performing a quick check beforehand.
  Original patch by Rauli Ruohonen.

- Issue #5853: calling a function of the mimetypes module from several threads
  at once could hit the recursion limit if the mimetypes database hadn't been
  initialized before.

- Issue #5854: Updated __all__ to include some missing names and remove some
  names which should not be exported.

- Issue #3102:  All global symbols that the _ctypes extension defines
  are now prefixed with 'Py' or '_ctypes'.

- Issue #5041: ctypes does now allow pickling wide character.

- Issue #5812: For the two-argument form of the Fraction constructor,
  Fraction(m, n), m and n are permitted to be arbitrary Rational
  instances.

- Issue #5812: Fraction('1e6') is valid: more generally, any string
  that's valid for float() is now valid for Fraction(), with the
  exception of strings representing NaNs and infinities.

- Issue #5734: BufferedRWPair was poorly tested and had several glaring
  bugs. Patch by Brian Quinlan.

- Issue #1161031: fix readwrite select flag handling: POLLPRI now
  results in a handle_expt_event call, not handle_read_event, and POLLERR
  and POLLNVAL now call handle_close, not handle_expt_event.  Also,
  dispatcher now has an 'ignore_log_types' attribute for suppressing
  log messages, which is set to 'warning' by default.

- Issue #2703: SimpleXMLRPCDispatcher.__init__: Provide default values for
  new arguments introduced in 2.5.

- Issue #5828 (Invalid behavior of unicode.lower): Fixed bogus logic in
  makeunicodedata.py and regenerated the Unicode database (This fixes
  u'\u1d79'.lower() == '\x00').

Extension Modules
-----------------

- Issue #5881: Remove old undocumented compatibility interfaces in hashlib and
  pwd.

- Issue #5463: In struct module, remove deprecated float coercion
  for integer type codes: struct.pack('L', 0.3) should now raise
  an error.  The _PY_STRUCT_FLOAT_COERCE constant has been removed.
  The version number has been bumped to 0.3.

- Issue #5359: Readd the Berkeley DB detection code to allow _dbm be built
  using Berkeley DB.

Tests
-----

- Issue #5354: New test support function import_fresh_module() makes
  it easy to import both normal and optimised versions of modules.
  test_heapq and test_warnings have been adjusted to use it, tests for
  other modules with both C and Python implementations in the stdlib
  can be adjusted to use it over time.

- Issue #5837: Certain sequences of calls to set() and unset() for
  support.EnvironmentVarGuard objects restored the environment variables
  incorrectly on __exit__.

C-API
-----

- Issue #5630: A replacement PyCObject API, PyCapsule, has been added.


What's New in Python 3.1 alpha 2?
=================================

*Release date: 2009-4-4*

Core and Builtins
-----------------

- Implement PEP 378, Format Specifier for Thousands Separator, for
  integers.

- Issue #5666: Py_BuildValue's 'c' code should create byte strings.

- Issue #5499: The 'c' code for argument parsing functions now only accepts a
  byte, and the 'C' code only accepts a unicode character.

- Fix a problem in PyErr_NormalizeException that leads to "undetected errors"
  when hitting the recursion limit under certain circumstances.

- Issue #1665206: Remove the last eager import in _warnings.c and make it lazy.

- Fix a segfault when running test_exceptions with coverage, caused by
  insufficient checks in accessors of Exception.__context__.

- Issue #5604: non-ASCII characters in module name passed to
  imp.find_module() were converted to UTF-8 while the path is
  converted to the default filesystem encoding, causing nonsense.

- Issue #5126: str.isprintable() returned False for space characters.

- Issue #4865: On MacOSX /Library/Python/2.7/site-packages is added to
  the end sys.path, for compatibility with the system install of Python.

- Issue #4688: Add a heuristic so that tuples and dicts containing only
  untrackable objects are not tracked by the garbage collector. This can
  reduce the size of collections and therefore the garbage collection overhead
  on long-running programs, depending on their particular use of datatypes.

- Issue #5512: Rewrite PyLong long division algorithm (x_divrem) to
  improve its performance.  Long divisions and remainder operations
  are now between 50% and 150% faster.

- Issue #4258: Make it possible to use base 2**30 instead of base
  2**15 for the internal representation of integers, for performance
  reasons.  Base 2**30 is enabled by default on 64-bit machines.  Add
  --enable-big-digits option to configure, which overrides the
  default.  Add sys.int_info structseq to provide information about
  the internal format.

- Issue #4474: PyUnicode_FromWideChar now converts characters outside
  the BMP to surrogate pairs, on systems with sizeof(wchar_t) == 4
  and sizeof(Py_UNICODE) == 2.

- Issue #5237: Allow auto-numbered fields in str.format(). For
  example: '{} {}'.format(1, 2) == '1 2'.

- Issue #5392: when a very low recursion limit was set, the interpreter would
  abort with a fatal error after the recursion limit was hit twice.

- Issue #3845: In PyRun_SimpleFileExFlags avoid invalid memory access with
  short file names.

Library
-------

- Issue #2625: added missing items() call to the for loop in
  mailbox.MH.get_message().

- Issue #5640: Fix _multibytecodec so that CJK codecs don't repeat
  error substitutions from non-strict codec error callbacks in
  incrementalencoder and StreamWriter.

- Issue #5656: Fix the coverage reporting when running the test suite with
  the -T argument.

- Issue #5647: MutableSet.__iand__() no longer mutates self during iteration.

- Issue #5624: Fix the _winreg module name still used in several modules.

- Issue #5628: Fix io.TextIOWrapper.read() with a unreadable buffer.

- Issue #5619: Multiprocessing children disobey the debug flag and causes
  popups on windows buildbots. Patch applied to work around this issue.

- Issue #5400: Added patch for multiprocessing on netbsd compilation/support

- Issue #5387: Fixed mmap.move crash by integer overflow.

- Issue #5261: Patch multiprocessing's semaphore.c to support context
  manager use: "with multiprocessing.Lock()" works now.

- Issue #5236: Change time.strptime() to only take strings. Didn't work with
  bytes already but the failure was non-obvious.

- Issue #5177: Multiprocessing's SocketListener class now uses
  socket.SO_REUSEADDR on all connections so that the user no longer needs
  to wait 120 seconds for the socket to expire.

- Issue #5595: Fix UnboundedLocalError in ntpath.ismount().

- Issue #1174606: Calling read() without arguments of an unbounded file
  (typically /dev/zero under Unix) could crash the interpreter.

- The max_buffer_size arguments of io.BufferedWriter, io.BufferedRWPair, and
  io.BufferedRandom have been deprecated for removal in Python 3.2.

- Issue #5068: Fixed the tarfile._BZ2Proxy.read() method that would loop
  forever on incomplete input. That caused tarfile.open() to hang when used
  with mode 'r' or 'r:bz2' and a fileobj argument that contained no data or
  partial bzip2 compressed data.

- Issue #2110: Add support for thousands separator and 'n' type
  specifier to Decimal.__format__

- Fix Decimal.__format__ bug that swapped the meanings of the '<' and
  '>' alignment characters.

- The error detection code in FileIO.close() could fail to reflect the `errno`
  value, and report it as -1 instead.

- Issue #5016: FileIO.seekable() could return False if the file position
  was negative when truncated to a C int. Patch by Victor Stinner.

Extension Modules
-----------------

- Issue #5391: mmap now deals exclusively with bytes.

- Issue #5463: In struct module, remove deprecated overflow wrapping
  when packing an integer: struct.pack('=L', -1) now raises
  struct.error instead of returning b'\xff\xff\xff\xff'.  The
  _PY_STRUCT_RANGE_CHECKING and _PY_STRUCT_OVERFLOW_MASKING constants
  have been removed from the struct module.


What's New in Python 3.1 alpha 1
================================

*Release date: 2009-03-07*

Core and Builtins
-----------------

- The io module has been reimplemented in C for speed.

- Give dict views an informative __repr__.

- Issue #5247: Improve error message when unknown format codes are
  used when using str.format() with str, int, and float arguments.

- Issue #5249: time.strftime returned malformed string when format string
  contained non ascii character on windows.

- Issue #4626: compile(), exec(), and eval() ignore the coding cookie if the
  source has already been decoded into str.

- Issue #5186: Reduce hash collisions for objects with no __hash__ method by
  rotating the object pointer by 4 bits to the right.

- Issue #4575: Fix Py_IS_INFINITY macro to work correctly on x87 FPUs:
  it now forces its argument to double before testing for infinity.

- Issue #5137: Make len() correctly raise a TypeError when a __len__ method
  returns a non-number type.

- Issue #5182: Removed memoryview.__str__.

- Issue #1717: Removed builtin cmp() function, dropped tp_compare
  slot, the C API functions PyObject_Compare and PyUnicode_Compare and
  the type definition cmpfunc.  The tp_compare slot has been renamed
  to tp_reserved, and is reserved for future usage.

- Issue #1242657: the __len__() and __length_hint__() calls in several tools
  were suppressing all exceptions.  These include list() and bytearray().

- Issue #4707: round(x, n) now returns an integer if x is an integer.
  Previously it returned a float.

- Issue #4753: By enabling a configure option named '--with-computed-gotos'
  on compilers that support it (notably: gcc, SunPro, icc), the bytecode
  evaluation loop is compiled with a new dispatch mechanism which gives
  speedups of up to 20%, depending on the system, on various benchmarks.

- Issue #4874: Most builtin decoders now reject unicode input.

- Issue #4842: Don't allow trailing 'L' when constructing an integer
  from a string.

- Issue #4991: os.fdopen now raises an OSError for invalid file descriptors.

- Issue #4838: When a module is deallocated, free the memory backing the
  optional module state data.

- Issue #4910: Rename nb_long slot to nb_reserved, and change its
  type to (void *).

- Issue #4935: The overflow checking code in the expandtabs() method common
  to str, bytes and bytearray could be optimized away by the compiler, letting
  the interpreter segfault instead of raising an error.

- Issue #3720: Fix a crash when an iterator modifies its class and removes its
  __next__ method.

- Issue #4910: Builtin int() function and PyNumber_Long/PyNumber_Int API
  function no longer attempt to call the __long__ slot to convert an object
  to an integer.  Only the __int__ and __trunc__ slots are examined.

- Issue #4893: Use NT threading on CE.

- Issue #4915: Port sysmodule to Windows CE.

- Issue #4868: utf-8, utf-16 and latin1 decoding are now 2x to 4x faster. The
  common cases are optimized thanks to a dedicated fast path and a moderate
  amount of loop unrolling.

- Issue #4074: Change the criteria for doing a full garbage collection (i.e.
  collecting the oldest generation) so that allocating lots of objects without
  destroying them does not show quadratic performance. Based on a proposal by
  Martin von Löwis at
  http://mail.python.org/pipermail/python-dev/2008-June/080579.html.

- Issue #4604: Some objects of the I/O library could still be used after
  having been closed (for instance, a read() call could return some
  previously buffered data). Patch by Dmitry Vasiliev.

- Issue #4705: Fix the -u ("unbuffered binary stdout and stderr") command-line
  flag to work properly. Furthermore, when specifying -u, the text stdout
  and stderr streams have line-by-line buffering enabled (the default being
  to buffer arbitrary chunks of data).

- The internal table, _PyLong_DigitValue, is now an array of unsigned chars
  instead of ints (reducing its size from 4 to 8 times thereby reducing
  Python's overall memory).

- Issue #1180193: When importing a module from a .pyc (or .pyo) file with
  an existing .py counterpart, override the co_filename attributes of all
  code objects if the original filename is obsolete (which can happen if the
  file has been renamed, moved, or if it is accessed through different paths).
  Patch by Ziga Seilnacht and Jean-Paul Calderone.

- Issue #4580: Fix slicing of memoryviews when the item size is greater than
  one byte. Also fixes the meaning of len() so that it returns the number of
  items, rather than the size in bytes.

- Issue #4075: Use OutputDebugStringW in Py_FatalError.

- Issue #4747: When the terminal does not use utf-8, executing a script with
  non-ascii characters in its name could fail with a "SyntaxError: None" error.

- Issue #4797: IOError.filename was not set when _fileio.FileIO failed to open
  file with `bytes' filename on Windows.

- Issue #3680: Reference cycles created through a dict, set or deque iterator
  did not get collected.

- Issue #4701: PyObject_Hash now implicitly calls PyType_Ready on types
  where the tp_hash and tp_dict slots are both NULL.

- Issue #4759: None is now allowed as the first argument of
  bytearray.translate().  It was always allowed for bytes.translate().

- Added test case to ensure attempts to read from a file opened for writing
  fail.

- Issue #3106: Speedup some comparisons (str/str and int/int).

- Issue #2183: Simplify and optimize bytecode for list, dict and set
  comprehensions. Original patch for list comprehensions by Neal Norwitz.

- Issue #2467: gc.DEBUG_STATS reported invalid elapsed times. Also, always
  print elapsed times, not only when some objects are uncollectable /
  unreachable. Original patch by Neil Schemenauer.

- Issue #3439: Add a bit_length method to int.

- Issue #2173: When getting device encoding, check that return value of
  nl_langinfo is not the empty string.  This was causing silent build
  failures on OS X.

- Issue #4597: Fixed several opcodes that weren't always propagating
  exceptions.

- Issue #4589: Fixed exception handling when the __exit__ function of a
  context manager returns a value that cannot be converted to a bool.

- Issue #4445: Replace "sizeof(PyBytesObject)" with
  "offsetof(PyBytesObject, ob_sval) + 1" when allocating memory for
  bytes instances.  On a typical machine this saves 3 bytes of memory
  (on average) per allocation of a bytes instance.

- Issue #4533: File read operation was dreadfully slow due to a slowly
  growing read buffer. Fixed by using the same growth rate algorithm as
  Python 2.x.

- Issue #4509: Various issues surrounding resize of bytearray objects to
  which there are buffer exports (e.g. memoryview instances).

- Issue #4233: Changed semantic of ``_fileio.FileIO``'s ``close()``
  method on file objects with closefd=False. The file descriptor is still
  kept open but the file object behaves like a closed file. The ``FileIO``
  object also got a new readonly attribute ``closefd``.

- Issue #4569: Interpreter crash when mutating a memoryview with an item size
  larger than 1.

- Issue #4748: Lambda generators no longer return a value.

- The re.sub(), re.subn() and re.split() functions now accept a flags parameter.

- Issue #5108: Handle %s like %S, %R and %A in PyUnicode_FromFormatV(): Call
  PyUnicode_DecodeUTF8() once, remember the result and output it in a second
  step. This avoids problems with counting UTF-8 bytes that ignores the effect
  of using the replace error handler in PyUnicode_DecodeUTF8().

Library
-------

- Issue #6545: Removed assert statements in distutils.Extension, so the
  behavior is similar when used with -O.

- Issue #6459: distutils.command.build_ext.get_export_symbols now uses the
  "PyInit" prefix, rather than "init".

- Issue #6433: fixed issues with multiprocessing.pool.map hanging on empty list

- Issue #6455: Fixed test_build_ext under win32.

- Issue #6413: Fixed the log level in distutils.dist for announce.

- Issue #6403: Fixed package path usage in build_ext.

- Issue #6365: Distutils build_ext inplace mode was copying the compiled
  extension in a subdirectory if the extension name had dots.

- Issue #6287: Added the license field in Distutils documentation.

- Issue #6263: Fixed syntax error in distutils.cygwincompiler.

- Issue #5201: distutils.sysconfig.parse_makefile() now understands `$$`
  in Makefiles. This prevents compile errors when using syntax like:
  `LDFLAGS='-rpath=\$$LIB:/some/other/path'`. Patch by Floris Bruynooghe.

- Issue #6131: test_modulefinder leaked when run after test_distutils.
  Patch by Hirokazu Yamamoto.

- Issue #6048: Now Distutils uses the tarfile module in archive_util.

- Issue #6062: In distutils, fixed the package option of build_ext. Feedback
  and tests on pywin32 by Tim Golden.

- Issue #6053: Fixed distutils tests on win32. patch by Hirokazu Yamamoto.

- Issue #6046: Fixed the library extension when distutils build_ext is used
  inplace. Initial patch by Roumen Petrov.

- Issue #6041: Now distutils `sdist` and `register` commands use `check` as a
  subcommand.

- Issue #6022: a test file was created in the current working directory by
  test_get_outputs in Distutils.

- Issue #5977: distutils build_ext.get_outputs was not taking into account the
  inplace option. Initial patch by kxroberto.

- Issue #5984: distutils.command.build_ext.check_extensions_list checks were broken
  for old-style extensions.

- Issue #5976: Fixed Distutils test_check_environ.

- Issue #5941: Distutils build_clib command was not working anymore because
  of an incomplete costumization of the archiver command. Added ARFLAGS in the
  Makefile besides AR and make Distutils use it. Original patch by David
  Cournapeau.

- Issue #2245: aifc now skips chunk types it doesn't recognize, per spec.

- Issue #5874: distutils.tests.test_config_cmd is not locale-sensitive
  anymore.

- Issue #5810: Fixed Distutils test_build_scripts so it uses
  sysconfig.get_config_vars.

- Issue #4951: Fixed failure in test_httpservers.

- Issue #5795: Fixed test_distutils failure on Debian ppc.

- Issue #5607: fixed Distutils test_get_platform for Mac OS X fat binaries.

- Issue #5741: don't disallow "%%" (which is an escape for "%") when setting
  a value in SafeConfigParser.

- Issue #5732: added a new command in Distutils: check.

- Issue #5731: Distutils bdist_wininst no longer worked on non-Windows
  platforms. Initial patch by Paul Moore.

- Issue #5095: Added bdist_msi to the list of bdist supported formats.
  Initial fix by Steven Bethard.

- Issue #1491431: Fixed distutils.filelist.glob_to_re for edge cases.
  Initial fix by Wayne Davison.

- Issue #5694: removed spurious test output in Distutils (test_clean).

- Issue #1326077: fix the formatting of SyntaxErrors by the traceback module.

- Issue #1665206 (partially): Move imports in cgitb to the top of the module
  instead of performing them in functions. Helps prevent import deadlocking in
  threads.

- Issue #2522: locale.format now checks its first argument to ensure it has
  been passed only one pattern, avoiding mysterious errors where it appeared
  that it was failing to do localization.

- Issue #5583: Added optional Extensions in Distutils. Initial patch by Georg
  Brandl.

- Issue #1222: locale.format() bug when the thousands separator is a space
  character.

- Issue #5472: Fixed distutils.test_util tear down. Original patch by
  Tim Golden.

- collections.deque() objects now have a read-only attribute called maxlen.

- Issue #2638: Show a window constructed with tkSimpleDialog.Dialog only after
  it is has been populated and properly configured in order to prevent
  window flashing.

- Issue #4792: Prevent a segfault in _tkinter by using the
  guaranteed to be safe interp argument given to the PythonCmd in place of
  the Tcl interpreter taken from a PythonCmd_ClientData.

- Issue #5193: Guarantee that tkinter.Text.search returns a string.

- Issue #5394: removed > 2.3 syntax from distutils.msvc9compiler.
  Original patch by Akira Kitada.

- Issue #5334: array.fromfile() failed to insert values when EOFError was raised.

- Issue #5385: Fixed mmap crash after resize failure on windows.

- Issue #5179: Fixed subprocess handle leak on failure on windows.

- PEP 372:  Added collections.OrderedDict().

- The _asdict() for method for namedtuples now returns an OrderedDict().

- configparser now defaults to using an ordered dictionary.

- Issue #5401: Fixed a performance problem in mimetypes when ``from mimetypes
  import guess_extension`` was used.

- Issue #1733986: Fixed mmap crash in accessing elements of second map object
  with same tagname but larger size than first map. (Windows)

- Issue #5386: mmap.write_byte didn't check map size, so it could cause buffer
  overrun.

- Issue #1533164: Installed but not listed *.pyo was breaking Distutils
  bdist_rpm command.

- Issue #5378: added --quiet option to Distutils bdist_rpm command.

- Issue #5052: make Distutils compatible with 2.3 again.

- Issue #5316: Fixed buildbot failures introduced by multiple inheritance
  in Distutils tests.

- Issue #5287: Add exception handling around findCaller() call to help out
  IronPython.

- Issue #5282: Fixed mmap resize on 32bit windows and unix. When offset > 0,
  The file was resized to wrong size.

- Issue #5292: Fixed mmap crash on its boundary access m[len(m)].

- Issue #2279: distutils.sdist.add_defaults now add files
  from the package_data and the data_files metadata.

- Issue #5257: refactored all tests in distutils, so they use
  support.TempdirManager, to avoid writing in the tests directory.

- Issue #4524: distutils build_script command failed with --with-suffix=3.
  Initial patch by Amaury Forgeot d'Arc.

- Issue #2461: added tests for distutils.util

- Issue #4998: The memory saving effect of __slots__ had been lost on Fractions
  which inherited from numbers.py which did not have __slots__ defined.  The
  numbers hierarchy now has its own __slots__ declarations.

- Issue #4631: Fix urlopen() result when an HTTP response uses chunked
  encoding.

- Issue #5203: Fixed ctypes segfaults when passing a unicode string to a
  function without argtypes (only occurs if HAVE_USABLE_WCHAR_T is false).

- Issue #3386: distutils.sysconfig.get_python_lib prefix argument was ignored
  under NT and OS2. Patch by Philip Jenvey.

- Issue #5128: Make compileall properly inspect bytecode to determine if needs
  to be recreated. This avoids a timing hole thanks to the old reliance on the
  ctime of the files involved.

- Issue #5122: Synchronize tk load failure check to prevent a potential
  deadlock.

- Issue #1818: collections.namedtuple() now supports a keyword argument
  'rename' which lets invalid fieldnames be automatically converted to
  positional names in the form, _1, _2, ...

- Issue #4890: Handle empty text search pattern in Tkinter.Text.search.

- Issue #4512 (part 2): Promote ``ZipImporter._get_filename()`` to be a
  public documented method ``ZipImporter.get_filename()``.

- Issue #4195: The ``runpy`` module (and the ``-m`` switch) now support
  the execution of packages by looking for and executing a ``__main__``
  submodule when a package name is supplied. Initial patch by Andi
  Vajda.

- Issue #1731706: Call Tcl_ConditionFinalize for Tcl_Conditions that will
  not be used again (this requires Tcl/Tk 8.3.1), also fix a memory leak in
  Tkapp_Call when calling from a thread different than the one that created
  the Tcl interpreter. Patch by Robert Hancock.

- Issue #4285: Change sys.version_info to be a named tuple. Patch by
  Ross Light.

- Issue #1520877: Now distutils.sysconfig reads $AR from the
  environment/Makefile. Patch by Douglas Greiman.

- Issue #1276768: The verbose option was not used in the code of
  distutils.file_util and distutils.dir_util.

- Issue #5132: Fixed trouble building extensions under Solaris with
  --enabled-shared activated. Initial patch by Dave Peterson.

- Issue #1581476: Always use the Tcl global namespace when calling into Tcl.

- The shelve module now defaults to pickle protocol 3.

- Fix a bug in the trace module where a bytes object from co_lnotab had its
  items being passed through ord().

- Issue #2047: shutil.move() could believe that its destination path was
  inside its source path if it began with the same letters (e.g. "src" vs.
  "src.new").

- Added the ttk module. See issue #2983: Ttk support for Tkinter.

- Removed isSequenceType(), isMappingType, and isNumberType() from the
  operator module; use the abstract base classes instead.  Also removed
  the repeat() function; use mul() instead.

- Issue #5021:  doctest.testfile() did not create __name__ and
  collections.namedtuple() relied on __name__ being defined.

- Backport importlib from Python 3.1. Only the import_module() function has
  been backported to help facilitate transitions from 2.7 to 3.1.

- Issue #1885: distutils. When running sdist with --formats=tar,gztar
  the tar file was overriden by the gztar one.

- Issue #4863: distutils.mwerkscompiler has been removed.

- Added a new itertools functions:  combinations_with_replacement()
  and compress().

- Issue #5032:  added a step argument to itertools.count() and
  allowed non-integer arguments.

- Fix and properly document the multiprocessing module's logging
  support, expose the internal levels and provide proper usage
  examples.

- Issue #1672332: fix unpickling of subnormal floats, which was
  producing a ValueError on some platforms.

- Issue #3881: Help Tcl to load even when started through the
  unreadable local symlink to "Program Files" on Vista.

- Issue #4710: Extract directories properly in the zipfile module;
  allow adding directories to a zipfile.

- Issue #3807: _multiprocessing build fails when configure is passed
  --without-threads argument. When this occurs, _multiprocessing will
  be disabled, and not compiled.

- Issue #5008: When a file is opened in append mode with the new IO library,
  do an explicit seek to the end of file (so that e.g. tell() returns the
  file size rather than 0). This is consistent with the behaviour of the
  traditional 2.x file object.

- Issue #5013: Fixed a bug in FileHandler which occurred when the delay
  parameter was set.

- Issue #4842: Always append a trailing 'L' when pickling longs using
  pickle protocol 0.  When reading, the 'L' is optional.

- Add the importlib package.

- Issue #4301: Patch the logging module to add processName support, remove
  _check_logger_class from multiprocessing.

- Issue #3325: Remove python2.x try: except: imports for old cPickle from
  multiprocessing.

- Issue #4959: inspect.formatargspec now works for keyword only arguments
  without defaults.

- Issue #3321: _multiprocessing.Connection() doesn't check handle; added checks
  for *nix machines for negative handles and large int handles. Without this check
  it is possible to segfault the interpreter.

- Issue #4449: AssertionError in mp_benchmarks.py, caused by an underlying issue
  in sharedctypes.py.

- Issue #1225107: inspect.isclass() returned True for instances with a custom
  __getattr__.

- Issue #3826 and #4791: The socket module now closes the underlying socket
  appropriately when it is being used via socket.makefile() objects
  rather than delaying the close by waiting for garbage collection to do it.

- Issue #1696199:  Add collections.Counter() for rapid and convenient
  counting.

- Issue #3860: GzipFile and BZ2File now support the context manager protocol.

- Issue #4867: Fixed a crash in ctypes when passing a string to a
  function without defining argtypes.

- Issue #4272: Add an optional argument to the GzipFile constructor to override
  the timestamp in the gzip stream. The default value remains the current time.
  The information can be used by e.g. gunzip when decompressing. Patch by
  Jacques Frechet.

- Restore Python 2.3 compatibility for decimal.py.

- Issue #3638: Remove functions from _tkinter module level that depend on
  TkappObject to work with multiple threads.

- Issue #4718: Adapt the wsgiref package so that it actually works with
  Python 3.x, in accordance with the `official amendments of the spec
  <http://www.wsgi.org/wsgi/Amendments_1.0>`_.

- Issue #4796: Added Decimal.from_float() and Context.create_decimal_from_float()
  to the decimal module.

- Fractions.from_float() no longer loses precision for integers too big to
  cast as floats.

- Issue #4812: add missing underscore prefix to some internal-use-only
  constants in the decimal module.  (Dec_0 becomes _Dec_0, etc.)

- Issue #4790: The nsmallest() and nlargest() functions in the heapq module
  did unnecessary work in the common case where no key function was specified.

- Issue #4795: inspect.isgeneratorfunction() returns False instead of None when
  the function is not a generator.

- Issue #4702: Throwing a DistutilsPlatformError instead of IOError in case
  no MSVC compiler is found under Windows. Original patch by Philip Jenvey.

- Issue #4646: distutils was choking on empty options arg in the setup
  function. Original patch by Thomas Heller.

- Issue #3767: Convert Tk object to string in tkColorChooser.

- Issue #3248: Allow placing ScrolledText in a PanedWindow.

- Issue #4444: Allow assertRaises() to be used as a context handler, so that
  the code under test can be written inline if more practical.

- Issue #4739: Add pydoc help topics for symbols, so that e.g. help('@')
  works as expected in the interactive environment.

- Issue #4756: zipfile.is_zipfile() now supports file-like objects. Patch by
  Gabriel Genellina.

- Issue #4574: reading an UTF16-encoded text file crashes if \r on 64-char
  boundary.

- Issue #4223: inspect.getsource() will now correctly display source code
  for packages loaded via zipimport (or any other conformant PEP 302
  loader). Original patch by Alexander Belopolsky.

- Issue #4201: pdb can now access and display source code loaded via
  zipimport (or any other conformant PEP 302 loader). Original patch by
  Alexander Belopolsky.

- Issue #4197: doctests in modules loaded via zipimport (or any other PEP
  302 conformant loader) will now work correctly in most cases (they
  are still subject to the constraints that exist for all code running
  from inside a module loaded via a PEP 302 loader and attempting to
  perform IO operations based on __file__). Original patch by
  Alexander Belopolsky.

- Issues #4082 and #4512: Add runpy support to zipimport in a manner that
  allows backporting to maintenance branches. Original patch by
  Alexander Belopolsky.

- Issue #4163: textwrap module: allow word splitting on a hyphen preceded by
  a non-ASCII letter.

- Issue #4616: TarFile.utime(): Restore directory times on Windows.

- Issue #4021: tokenize.detect_encoding() now raises a SyntaxError when the
  codec cannot be found.  This is for compatibility with the builtin behavior.

- Issue #4084: Fix max, min, max_mag and min_mag Decimal methods to
  give correct results in the case where one argument is a quiet NaN
  and the other is a finite number that requires rounding.

- Issue #4483: _dbm module now builds on systems with gdbm & gdbm_compat
  libs.

- Added the subprocess.check_call_output() convenience function to get output
  from a subprocess on success or raise an exception on error.

- Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
  support unusual filenames (such as those containing semi-colons) in
  Content-Disposition headers.

- Issue #4384: Added logging integration with warnings module using
  captureWarnings(). This change includes a NullHandler which does nothing;
  it will be of use to library developers who want to avoid the "No handlers
  could be found for logger XXX" message which can appear if the library user
  doesn't configure logging.

- Issue #3741: DISTUTILS_USE_SDK set causes msvc9compiler.py to raise an
  exception.

- Issue #4529: fix the parser module's validation of try-except-finally
  statements.

- Issue #4458: getopt.gnu_getopt() now recognizes a single "-" as an argument,
  not a malformed option.

- Added the subprocess.check_output() convenience function to get output
  from a subprocess on success or raise an exception on error.

- Issue #4542: On Windows, binascii.crc32 still accepted str as binary input;
  the corresponding tests now pass.

- Issue #4537: webbrowser.UnixBrowser would fail to open the browser because
  it was calling the wrong open() function.

- Issue #1055234: cgi.parse_header(): Fixed parsing of header parameters to
  support unusual filenames (such as those containing semi-colons) in
  Content-Disposition headers.

- Issue #4861: ctypes.util.find_library(): Robustify. Fix library detection on
  biarch systems. Try to rely on ldconfig only, without using objdump and gcc.

- Issue #5104: The socket module now raises OverflowError when 16-bit port and
  protocol numbers are supplied outside the allowed 0-65536 range on bind()
  and getservbyport().

- Windows locale mapping updated to Vista.

Tools/Demos
-----------

- Issue #4704: remove use of cmp() in pybench, bump its version number to 2.1,
  and make it 2.6-compatible.

- Ttk demos added in Demo/tkinter/ttk/

- Issue #4677: add two list comprehension tests to pybench.


Build
-----

- Issue #6094: Build correctly with Subversion 1.7.

- Issue #5847: Remove -n switch on "Edit with IDLE" menu item.

- Issue #5726: Make Modules/ld_so_aix return the actual exit code of the
  linker, rather than always exit successfully. Patch by Floris Bruynooghe.

- Issue #4587: Add configure option --with-dbmliborder=db1:db2:... to specify
  the order that backends for the dbm extension are checked.

- Link the shared python library with $(MODLIBS).

- Issue #5134: Silence compiler warnings when compiling sqlite with VC++.

- Issue #4494: Fix build with Py_NO_ENABLE_SHARED on Windows.

- Issue #4895: Use _strdup on Windows CE.

- Issue #4472: "configure --enable-shared" now works on OSX

- Issues #4728 and #4060: WORDS_BIGEDIAN is now correct in Universal builds.

- Issue #4389: Add icon to the uninstall entry in "add-and-remove-programs".

- Issue #4289: Remove Cancel button from AdvancedDlg.

- Issue #1656675: Register a drop handler for .py* files on Windows.

- Issue #4120: Exclude manifest from extension modules in VS2008.

- Issue #4091: Install pythonxy.dll in system32 again.

- Issue #4018: Disable "for me" installations on Vista.

- Issue #3758: Add ``patchcheck`` build target to .PHONY.

- Issue #4204: Fixed module build errors on FreeBSD 4.


C-API
-----

- Issue #5175: PyLong_AsUnsignedLongLong now raises OverflowError
  for negative arguments.  Previously, it raised TypeError.

- Issue #4720: The format for PyArg_ParseTupleAndKeywords can begin with '|'.

- Issue #3632: from the gdb debugger, the 'pyo' macro can now be called when
  the GIL is released, or owned by another thread.

- Issue #4122: On Windows, fix a compilation error when using the
  Py_UNICODE_ISSPACE macro in an extension module.


Extension Modules
-----------------

- Issue #3745: Fix hashlib to always reject unicode and non buffer-api
  supporting objects as input no matter how it was compiled (built in
  implementations or external openssl library).

- Issue #4397: Fix occasional test_socket failure on OS X.

- Issue #4279: Fix build of parsermodule under Cygwin.

- Issue #4751: hashlib now releases the GIL when hashing large buffers
  (with a hardwired threshold of 2048 bytes), allowing better parallelization
  on multi-CPU systems. Contributed by Lukas Lueg (ebfe) and Victor Stinner.

- Issue #4051: Prevent conflict of UNICODE macros in cPickle.

- Issue #4738: Each zlib object now has a separate lock, allowing to compress
  or decompress several streams at once on multi-CPU systems. Also, the GIL
  is now released when computing the CRC of a large buffer. Patch by ebfe.

- Issue #4228: Pack negative values the same way as 2.4 in struct's L format.

- Issue #1040026: Fix os.times result on systems where HZ is incorrect.

- Issues #3167, #3682: Fix test_math failures for log, log10 on Solaris,
  OpenBSD.

- Issue #4583: array.array would not always prohibit resizing when a buffer
  has been exported, resulting in an interpreter crash when accessing the
  buffer.


- Issue #5228: Make functools.partial objects can now be pickled.

Tests
-----

- Issue #5450: Moved tests involving loading tk from Lib/test/test_tcl to
  Lib/tkinter/test/test_tkinter/test_loadtk. With this, these tests demonstrate
  the same behaviour as test_ttkguionly (and now also test_tk) which is to
  skip the tests if DISPLAY is defined but can't be used.

- regrtest no longer treats ImportError as equivalent to SkipTest.  Imports
  that should cause a test to be skipped are now done using import_module
  from test support, which does the conversion.

- Issue #5083: New 'gui' resource for regrtest.


Docs
----


**(For information about older versions, consult the HISTORY file.)**