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
|
from test.test_support import verbose
import random
nerrors = 0
def check(tag, expected, raw, compare=None):
global nerrors
if verbose:
print " checking", tag
orig = raw[:] # save input in case of error
if compare:
raw.sort(compare)
else:
raw.sort()
if len(expected) != len(raw):
print "error in", tag
print "length mismatch;", len(expected), len(raw)
print expected
print orig
print raw
nerrors += 1
return
for i, good in enumerate(expected):
maybe = raw[i]
if good is not maybe:
print "error in", tag
print "out of order at index", i, good, maybe
print expected
print orig
print raw
nerrors += 1
return
# Try a variety of sizes at and around powers of 2, and at powers of 10.
sizes = [0]
for power in range(1, 10):
n = 2 ** power
sizes.extend(range(n-1, n+2))
sizes.extend([10, 100, 1000])
class Complains(object):
maybe_complain = True
def __init__(self, i):
self.i = i
def __lt__(self, other):
if Complains.maybe_complain and random.random() < 0.001:
if verbose:
print " complaining at", self, other
raise RuntimeError
return self.i < other.i
def __repr__(self):
return "Complains(%d)" % self.i
class Stable(object):
def __init__(self, key, i):
self.key = key
self.index = i
def __cmp__(self, other):
return cmp(self.key, other.key)
def __repr__(self):
return "Stable(%d, %d)" % (self.key, self.index)
for n in sizes:
x = range(n)
if verbose:
print "Testing size", n
s = x[:]
check("identity", x, s)
s = x[:]
s.reverse()
check("reversed", x, s)
s = x[:]
random.shuffle(s)
check("random permutation", x, s)
y = x[:]
y.reverse()
s = x[:]
check("reversed via function", y, s, lambda a, b: cmp(b, a))
if verbose:
print " Checking against an insane comparison function."
print " If the implementation isn't careful, this may segfault."
s = x[:]
s.sort(lambda a, b: int(random.random() * 3) - 1)
check("an insane function left some permutation", x, s)
x = [Complains(i) for i in x]
s = x[:]
random.shuffle(s)
Complains.maybe_complain = True
it_complained = False
try:
s.sort()
except RuntimeError:
it_complained = True
if it_complained:
Complains.maybe_complain = False
check("exception during sort left some permutation", x, s)
s = [Stable(random.randrange(10), i) for i in xrange(n)]
augmented = [(e, e.index) for e in s]
augmented.sort() # forced stable because ties broken by index
x = [e for e, i in augmented] # a stable sort of s
check("stability", x, s)
import unittest
from test import test_support
import sys
#==============================================================================
class TestBugs(unittest.TestCase):
def test_bug453523(self):
# bug 453523 -- list.sort() crasher.
# If this fails, the most likely outcome is a core dump.
# Mutations during a list sort should raise a ValueError.
class C:
def __lt__(self, other):
if L and random.random() < 0.75:
L.pop()
else:
L.append(3)
return random.random() < 0.5
L = [C() for i in range(50)]
self.assertRaises(ValueError, L.sort)
def test_cmpNone(self):
# Testing None as a comparison function.
L = range(50)
random.shuffle(L)
L.sort(None)
self.assertEqual(L, range(50))
#==============================================================================
class TestDecorateSortUndecorate(unittest.TestCase):
def test_decorated(self):
data = 'The quick Brown fox Jumped over The lazy Dog'.split()
copy = data[:]
random.shuffle(data)
data.sort(key=str.lower)
copy.sort(cmp=lambda x,y: cmp(x.lower(), y.lower()))
def test_baddecorator(self):
data = 'The quick Brown fox Jumped over The lazy Dog'.split()
self.assertRaises(TypeError, data.sort, None, lambda x,y: 0)
def test_stability(self):
data = [(random.randrange(100), i) for i in xrange(200)]
copy = data[:]
data.sort(key=lambda (x,y): x) # sort on the random first field
copy.sort() # sort using both fields
self.assertEqual(data, copy) # should get the same result
def test_cmp_and_key_combination(self):
# Verify that the wrapper has been removed
def compare(x, y):
self.assertEqual(type(x), str)
self.assertEqual(type(x), str)
return cmp(x, y)
data = 'The quick Brown fox Jumped over The lazy Dog'.split()
data.sort(cmp=compare, key=str.lower)
def test_badcmp_with_key(self):
# Verify that the wrapper has been removed
data = 'The quick Brown fox Jumped over The lazy Dog'.split()
self.assertRaises(TypeError, data.sort, "bad", str.lower)
def test_reverse(self):
data = range(100)
random.shuffle(data)
data.sort(reverse=True)
self.assertEqual(data, range(99,-1,-1))
def test_reverse_stability(self):
data = [(random.randrange(100), i) for i in xrange(200)]
copy1 = data[:]
copy2 = data[:]
data.sort(cmp=lambda x,y: cmp(x[0],y[0]), reverse=True)
copy1.sort(cmp=lambda x,y: cmp(y[0],x[0]))
self.assertEqual(data, copy1)
copy2.sort(key=lambda x: x[0], reverse=True)
self.assertEqual(data, copy2)
#==============================================================================
def test_main(verbose=None):
test_classes = (
TestDecorateSortUndecorate,
TestBugs,
)
test_support.run_unittest(*test_classes)
# verify reference counting
if verbose and hasattr(sys, "gettotalrefcount"):
import gc
counts = [None] * 5
for i in xrange(len(counts)):
test_support.run_unittest(*test_classes)
gc.collect()
counts[i] = sys.gettotalrefcount()
print counts
if __name__ == "__main__":
test_main(verbose=True)
|
