summaryrefslogtreecommitdiffstats
path: root/Lib/test/seq_tests.py
blob: 1e7a6f652226649c8ef1a2415540cecfc12acb3f (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
"""
Tests common to tuple, list and UserList.UserList
"""

import unittest
import sys
import pickle
from test import support

# Various iterables
# This is used for checking the constructor (here and in test_deque.py)
def iterfunc(seqn):
    'Regular generator'
    for i in seqn:
        yield i

class Sequence:
    'Sequence using __getitem__'
    def __init__(self, seqn):
        self.seqn = seqn
    def __getitem__(self, i):
        return self.seqn[i]

class IterFunc:
    'Sequence using iterator protocol'
    def __init__(self, seqn):
        self.seqn = seqn
        self.i = 0
    def __iter__(self):
        return self
    def __next__(self):
        if self.i >= len(self.seqn): raise StopIteration
        v = self.seqn[self.i]
        self.i += 1
        return v

class IterGen:
    'Sequence using iterator protocol defined with a generator'
    def __init__(self, seqn):
        self.seqn = seqn
        self.i = 0
    def __iter__(self):
        for val in self.seqn:
            yield val

class IterNextOnly:
    'Missing __getitem__ and __iter__'
    def __init__(self, seqn):
        self.seqn = seqn
        self.i = 0
    def __next__(self):
        if self.i >= len(self.seqn): raise StopIteration
        v = self.seqn[self.i]
        self.i += 1
        return v

class IterNoNext:
    'Iterator missing __next__()'
    def __init__(self, seqn):
        self.seqn = seqn
        self.i = 0
    def __iter__(self):
        return self

class IterGenExc:
    'Test propagation of exceptions'
    def __init__(self, seqn):
        self.seqn = seqn
        self.i = 0
    def __iter__(self):
        return self
    def __next__(self):
        3 // 0

class IterFuncStop:
    'Test immediate stop'
    def __init__(self, seqn):
        pass
    def __iter__(self):
        return self
    def __next__(self):
        raise StopIteration

from itertools import chain
def itermulti(seqn):
    'Test multiple tiers of iterators'
    return chain(map(lambda x:x, iterfunc(IterGen(Sequence(seqn)))))

class LyingTuple(tuple):
    def __iter__(self):
        yield 1

class LyingList(list):
    def __iter__(self):
        yield 1

class CommonTest(unittest.TestCase):
    # The type to be tested
    type2test = None

    def test_constructors(self):
        l0 = []
        l1 = [0]
        l2 = [0, 1]

        u = self.type2test()
        u0 = self.type2test(l0)
        u1 = self.type2test(l1)
        u2 = self.type2test(l2)

        uu = self.type2test(u)
        uu0 = self.type2test(u0)
        uu1 = self.type2test(u1)
        uu2 = self.type2test(u2)

        v = self.type2test(tuple(u))
        class OtherSeq:
            def __init__(self, initseq):
                self.__data = initseq
            def __len__(self):
                return len(self.__data)
            def __getitem__(self, i):
                return self.__data[i]
        s = OtherSeq(u0)
        v0 = self.type2test(s)
        self.assertEqual(len(v0), len(s))

        s = "this is also a sequence"
        vv = self.type2test(s)
        self.assertEqual(len(vv), len(s))

        # Create from various iteratables
        for s in ("123", "", range(1000), ('do', 1.2), range(2000,2200,5)):
            for g in (Sequence, IterFunc, IterGen,
                      itermulti, iterfunc):
                self.assertEqual(self.type2test(g(s)), self.type2test(s))
            self.assertEqual(self.type2test(IterFuncStop(s)), self.type2test())
            self.assertEqual(self.type2test(c for c in "123"), self.type2test("123"))
            self.assertRaises(TypeError, self.type2test, IterNextOnly(s))
            self.assertRaises(TypeError, self.type2test, IterNoNext(s))
            self.assertRaises(ZeroDivisionError, self.type2test, IterGenExc(s))

        # Issue #23757
        self.assertEqual(self.type2test(LyingTuple((2,))), self.type2test((1,)))
        self.assertEqual(self.type2test(LyingList([2])), self.type2test([1]))

    def test_truth(self):
        self.assertFalse(self.type2test())
        self.assertTrue(self.type2test([42]))

    def test_getitem(self):
        u = self.type2test([0, 1, 2, 3, 4])
        for i in range(len(u)):
            self.assertEqual(u[i], i)
            self.assertEqual(u[int(i)], i)
        for i in range(-len(u), -1):
            self.assertEqual(u[i], len(u)+i)
            self.assertEqual(u[int(i)], len(u)+i)
        self.assertRaises(IndexError, u.__getitem__, -len(u)-1)
        self.assertRaises(IndexError, u.__getitem__, len(u))
        self.assertRaises(ValueError, u.__getitem__, slice(0,10,0))

        u = self.type2test()
        self.assertRaises(IndexError, u.__getitem__, 0)
        self.assertRaises(IndexError, u.__getitem__, -1)

        self.assertRaises(TypeError, u.__getitem__)

        a = self.type2test([10, 11])
        self.assertEqual(a[0], 10)
        self.assertEqual(a[1], 11)
        self.assertEqual(a[-2], 10)
        self.assertEqual(a[-1], 11)
        self.assertRaises(IndexError, a.__getitem__, -3)
        self.assertRaises(IndexError, a.__getitem__, 3)

    def test_getslice(self):
        l = [0, 1, 2, 3, 4]
        u = self.type2test(l)

        self.assertEqual(u[0:0], self.type2test())
        self.assertEqual(u[1:2], self.type2test([1]))
        self.assertEqual(u[-2:-1], self.type2test([3]))
        self.assertEqual(u[-1000:1000], u)
        self.assertEqual(u[1000:-1000], self.type2test([]))
        self.assertEqual(u[:], u)
        self.assertEqual(u[1:None], self.type2test([1, 2, 3, 4]))
        self.assertEqual(u[None:3], self.type2test([0, 1, 2]))

        # Extended slices
        self.assertEqual(u[::], u)
        self.assertEqual(u[::2], self.type2test([0, 2, 4]))
        self.assertEqual(u[1::2], self.type2test([1, 3]))
        self.assertEqual(u[::-1], self.type2test([4, 3, 2, 1, 0]))
        self.assertEqual(u[::-2], self.type2test([4, 2, 0]))
        self.assertEqual(u[3::-2], self.type2test([3, 1]))
        self.assertEqual(u[3:3:-2], self.type2test([]))
        self.assertEqual(u[3:2:-2], self.type2test([3]))
        self.assertEqual(u[3:1:-2], self.type2test([3]))
        self.assertEqual(u[3:0:-2], self.type2test([3, 1]))
        self.assertEqual(u[::-100], self.type2test([4]))
        self.assertEqual(u[100:-100:], self.type2test([]))
        self.assertEqual(u[-100:100:], u)
        self.assertEqual(u[100:-100:-1], u[::-1])
        self.assertEqual(u[-100:100:-1], self.type2test([]))
        self.assertEqual(u[-100:100:2], self.type2test([0, 2, 4]))

        # Test extreme cases with long ints
        a = self.type2test([0,1,2,3,4])
        self.assertEqual(a[ -pow(2,128): 3 ], self.type2test([0,1,2]))
        self.assertEqual(a[ 3: pow(2,145) ], self.type2test([3,4]))

    def test_contains(self):
        u = self.type2test([0, 1, 2])
        for i in u:
            self.assertIn(i, u)
        for i in min(u)-1, max(u)+1:
            self.assertNotIn(i, u)

        self.assertRaises(TypeError, u.__contains__)

    def test_contains_fake(self):
        class AllEq:
            # Sequences must use rich comparison against each item
            # (unless "is" is true, or an earlier item answered)
            # So instances of AllEq must be found in all non-empty sequences.
            def __eq__(self, other):
                return True
            __hash__ = None # Can't meet hash invariant requirements
        self.assertNotIn(AllEq(), self.type2test([]))
        self.assertIn(AllEq(), self.type2test([1]))

    def test_contains_order(self):
        # Sequences must test in-order.  If a rich comparison has side
        # effects, these will be visible to tests against later members.
        # In this test, the "side effect" is a short-circuiting raise.
        class DoNotTestEq(Exception):
            pass
        class StopCompares:
            def __eq__(self, other):
                raise DoNotTestEq

        checkfirst = self.type2test([1, StopCompares()])
        self.assertIn(1, checkfirst)
        checklast = self.type2test([StopCompares(), 1])
        self.assertRaises(DoNotTestEq, checklast.__contains__, 1)

    def test_len(self):
        self.assertEqual(len(self.type2test()), 0)
        self.assertEqual(len(self.type2test([])), 0)
        self.assertEqual(len(self.type2test([0])), 1)
        self.assertEqual(len(self.type2test([0, 1, 2])), 3)

    def test_minmax(self):
        u = self.type2test([0, 1, 2])
        self.assertEqual(min(u), 0)
        self.assertEqual(max(u), 2)

    def test_addmul(self):
        u1 = self.type2test([0])
        u2 = self.type2test([0, 1])
        self.assertEqual(u1, u1 + self.type2test())
        self.assertEqual(u1, self.type2test() + u1)
        self.assertEqual(u1 + self.type2test([1]), u2)
        self.assertEqual(self.type2test([-1]) + u1, self.type2test([-1, 0]))
        self.assertEqual(self.type2test(), u2*0)
        self.assertEqual(self.type2test(), 0*u2)
        self.assertEqual(self.type2test(), u2*0)
        self.assertEqual(self.type2test(), 0*u2)
        self.assertEqual(u2, u2*1)
        self.assertEqual(u2, 1*u2)
        self.assertEqual(u2, u2*1)
        self.assertEqual(u2, 1*u2)
        self.assertEqual(u2+u2, u2*2)
        self.assertEqual(u2+u2, 2*u2)
        self.assertEqual(u2+u2, u2*2)
        self.assertEqual(u2+u2, 2*u2)
        self.assertEqual(u2+u2+u2, u2*3)
        self.assertEqual(u2+u2+u2, 3*u2)

        class subclass(self.type2test):
            pass
        u3 = subclass([0, 1])
        self.assertEqual(u3, u3*1)
        self.assertIsNot(u3, u3*1)

    def test_iadd(self):
        u = self.type2test([0, 1])
        u += self.type2test()
        self.assertEqual(u, self.type2test([0, 1]))
        u += self.type2test([2, 3])
        self.assertEqual(u, self.type2test([0, 1, 2, 3]))
        u += self.type2test([4, 5])
        self.assertEqual(u, self.type2test([0, 1, 2, 3, 4, 5]))

        u = self.type2test("spam")
        u += self.type2test("eggs")
        self.assertEqual(u, self.type2test("spameggs"))

    def test_imul(self):
        u = self.type2test([0, 1])
        u *= 3
        self.assertEqual(u, self.type2test([0, 1, 0, 1, 0, 1]))

    def test_getitemoverwriteiter(self):
        # Verify that __getitem__ overrides are not recognized by __iter__
        class T(self.type2test):
            def __getitem__(self, key):
                return str(key) + '!!!'
        self.assertEqual(next(iter(T((1,2)))), 1)

    def test_repeat(self):
        for m in range(4):
            s = tuple(range(m))
            for n in range(-3, 5):
                self.assertEqual(self.type2test(s*n), self.type2test(s)*n)
            self.assertEqual(self.type2test(s)*(-4), self.type2test([]))
            self.assertEqual(id(s), id(s*1))

    def test_bigrepeat(self):
        if sys.maxsize <= 2147483647:
            x = self.type2test([0])
            x *= 2**16
            self.assertRaises(MemoryError, x.__mul__, 2**16)
            if hasattr(x, '__imul__'):
                self.assertRaises(MemoryError, x.__imul__, 2**16)

    def test_subscript(self):
        a = self.type2test([10, 11])
        self.assertEqual(a.__getitem__(0), 10)
        self.assertEqual(a.__getitem__(1), 11)
        self.assertEqual(a.__getitem__(-2), 10)
        self.assertEqual(a.__getitem__(-1), 11)
        self.assertRaises(IndexError, a.__getitem__, -3)
        self.assertRaises(IndexError, a.__getitem__, 3)
        self.assertEqual(a.__getitem__(slice(0,1)), self.type2test([10]))
        self.assertEqual(a.__getitem__(slice(1,2)), self.type2test([11]))
        self.assertEqual(a.__getitem__(slice(0,2)), self.type2test([10, 11]))
        self.assertEqual(a.__getitem__(slice(0,3)), self.type2test([10, 11]))
        self.assertEqual(a.__getitem__(slice(3,5)), self.type2test([]))
        self.assertRaises(ValueError, a.__getitem__, slice(0, 10, 0))
        self.assertRaises(TypeError, a.__getitem__, 'x')

    def test_count(self):
        a = self.type2test([0, 1, 2])*3
        self.assertEqual(a.count(0), 3)
        self.assertEqual(a.count(1), 3)
        self.assertEqual(a.count(3), 0)

        self.assertRaises(TypeError, a.count)

        class BadExc(Exception):
            pass

        class BadCmp:
            def __eq__(self, other):
                if other == 2:
                    raise BadExc()
                return False

        self.assertRaises(BadExc, a.count, BadCmp())

    def test_index(self):
        u = self.type2test([0, 1])
        self.assertEqual(u.index(0), 0)
        self.assertEqual(u.index(1), 1)
        self.assertRaises(ValueError, u.index, 2)

        u = self.type2test([-2, -1, 0, 0, 1, 2])
        self.assertEqual(u.count(0), 2)
        self.assertEqual(u.index(0), 2)
        self.assertEqual(u.index(0, 2), 2)
        self.assertEqual(u.index(-2, -10), 0)
        self.assertEqual(u.index(0, 3), 3)
        self.assertEqual(u.index(0, 3, 4), 3)
        self.assertRaises(ValueError, u.index, 2, 0, -10)

        self.assertRaises(TypeError, u.index)

        class BadExc(Exception):
            pass

        class BadCmp:
            def __eq__(self, other):
                if other == 2:
                    raise BadExc()
                return False

        a = self.type2test([0, 1, 2, 3])
        self.assertRaises(BadExc, a.index, BadCmp())

        a = self.type2test([-2, -1, 0, 0, 1, 2])
        self.assertEqual(a.index(0), 2)
        self.assertEqual(a.index(0, 2), 2)
        self.assertEqual(a.index(0, -4), 2)
        self.assertEqual(a.index(-2, -10), 0)
        self.assertEqual(a.index(0, 3), 3)
        self.assertEqual(a.index(0, -3), 3)
        self.assertEqual(a.index(0, 3, 4), 3)
        self.assertEqual(a.index(0, -3, -2), 3)
        self.assertEqual(a.index(0, -4*sys.maxsize, 4*sys.maxsize), 2)
        self.assertRaises(ValueError, a.index, 0, 4*sys.maxsize,-4*sys.maxsize)
        self.assertRaises(ValueError, a.index, 2, 0, -10)

    def test_pickle(self):
        lst = self.type2test([4, 5, 6, 7])
        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
            lst2 = pickle.loads(pickle.dumps(lst, proto))
            self.assertEqual(lst2, lst)
            self.assertNotEqual(id(lst2), id(lst))

    def test_free_after_iterating(self):
        support.check_free_after_iterating(self, iter, self.type2test)
        support.check_free_after_iterating(self, reversed, self.type2test)