Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_sort.py @ 79691:05c8928362ee

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Merge __next__ method link fixes with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 12 Oct 2012 13:46:37 +0300
parents fefb7d355361
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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9c930a32cebb #2621 rename test.test_support to test.support
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1 from test import support
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2 import random
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3 import sys
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4 import unittest
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5 from functools import cmp_to_key
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6
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7 verbose = support.verbose
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8 nerrors = 0
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9
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10
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11 def check(tag, expected, raw, compare=None):
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12 global nerrors
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13
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14 if verbose:
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15 print(" checking", tag)
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16
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17 orig = raw[:] # save input in case of error
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18 if compare:
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19 raw.sort(key=cmp_to_key(compare))
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20 else:
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21 raw.sort()
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22
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23 if len(expected) != len(raw):
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24 print("error in", tag)
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25 print("length mismatch;", len(expected), len(raw))
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26 print(expected)
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27 print(orig)
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28 print(raw)
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29 nerrors += 1
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30 return
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31
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32 for i, good in enumerate(expected):
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33 maybe = raw[i]
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34 if good is not maybe:
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35 print("error in", tag)
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36 print("out of order at index", i, good, maybe)
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37 print(expected)
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38 print(orig)
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39 print(raw)
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40 nerrors += 1
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41 return
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42
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43 class TestBase(unittest.TestCase):
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44 def testStressfully(self):
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45 # Try a variety of sizes at and around powers of 2, and at powers of 10.
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46 sizes = [0]
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47 for power in range(1, 10):
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48 n = 2 ** power
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49 sizes.extend(range(n-1, n+2))
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50 sizes.extend([10, 100, 1000])
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51
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52 class Complains(object):
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53 maybe_complain = True
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54
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55 def __init__(self, i):
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56 self.i = i
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57
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58 def __lt__(self, other):
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59 if Complains.maybe_complain and random.random() < 0.001:
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60 if verbose:
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61 print(" complaining at", self, other)
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62 raise RuntimeError
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63 return self.i < other.i
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64
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65 def __repr__(self):
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66 return "Complains(%d)" % self.i
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67
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68 class Stable(object):
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69 def __init__(self, key, i):
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70 self.key = key
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71 self.index = i
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72
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73 def __lt__(self, other):
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74 return self.key < other.key
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75
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76 def __repr__(self):
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77 return "Stable(%d, %d)" % (self.key, self.index)
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78
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79 for n in sizes:
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80 x = list(range(n))
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81 if verbose:
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82 print("Testing size", n)
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83
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84 s = x[:]
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85 check("identity", x, s)
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86
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87 s = x[:]
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88 s.reverse()
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89 check("reversed", x, s)
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90
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91 s = x[:]
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92 random.shuffle(s)
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93 check("random permutation", x, s)
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94
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95 y = x[:]
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96 y.reverse()
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97 s = x[:]
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98 check("reversed via function", y, s, lambda a, b: (b>a)-(b<a))
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99
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100 if verbose:
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101 print(" Checking against an insane comparison function.")
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102 print(" If the implementation isn't careful, this may segfault.")
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103 s = x[:]
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104 s.sort(key=cmp_to_key(lambda a, b: int(random.random() * 3) - 1))
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105 check("an insane function left some permutation", x, s)
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106
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107 if len(x) >= 2:
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108 def bad_key(x):
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109 raise RuntimeError
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110 s = x[:]
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111 self.assertRaises(RuntimeError, s.sort, key=bad_key)
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112
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113 x = [Complains(i) for i in x]
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114 s = x[:]
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115 random.shuffle(s)
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116 Complains.maybe_complain = True
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117 it_complained = False
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118 try:
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119 s.sort()
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120 except RuntimeError:
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121 it_complained = True
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122 if it_complained:
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123 Complains.maybe_complain = False
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124 check("exception during sort left some permutation", x, s)
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125
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126 s = [Stable(random.randrange(10), i) for i in range(n)]
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127 augmented = [(e, e.index) for e in s]
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128 augmented.sort() # forced stable because ties broken by index
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129 x = [e for e, i in augmented] # a stable sort of s
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130 check("stability", x, s)
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131
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132 #==============================================================================
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133
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134 class TestBugs(unittest.TestCase):
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135
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136 def test_bug453523(self):
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137 # bug 453523 -- list.sort() crasher.
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138 # If this fails, the most likely outcome is a core dump.
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139 # Mutations during a list sort should raise a ValueError.
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140
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141 class C:
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142 def __lt__(self, other):
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143 if L and random.random() < 0.75:
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144 L.pop()
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145 else:
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146 L.append(3)
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147 return random.random() < 0.5
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148
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149 L = [C() for i in range(50)]
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150 self.assertRaises(ValueError, L.sort)
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151
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152 def test_undetected_mutation(self):
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153 # Python 2.4a1 did not always detect mutation
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154 memorywaster = []
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155 for i in range(20):
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156 def mutating_cmp(x, y):
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157 L.append(3)
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158 L.pop()
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159 return (x > y) - (x < y)
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160 L = [1,2]
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161 self.assertRaises(ValueError, L.sort, key=cmp_to_key(mutating_cmp))
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162 def mutating_cmp(x, y):
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163 L.append(3)
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164 del L[:]
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165 return (x > y) - (x < y)
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166 self.assertRaises(ValueError, L.sort, key=cmp_to_key(mutating_cmp))
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167 memorywaster = [memorywaster]
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168
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169 #==============================================================================
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170
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171 class TestDecorateSortUndecorate(unittest.TestCase):
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172
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173 def test_decorated(self):
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174 data = 'The quick Brown fox Jumped over The lazy Dog'.split()
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175 copy = data[:]
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176 random.shuffle(data)
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177 data.sort(key=str.lower)
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178 def my_cmp(x, y):
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179 xlower, ylower = x.lower(), y.lower()
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180 return (xlower > ylower) - (xlower < ylower)
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181 copy.sort(key=cmp_to_key(my_cmp))
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182
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183 def test_baddecorator(self):
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184 data = 'The quick Brown fox Jumped over The lazy Dog'.split()
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185 self.assertRaises(TypeError, data.sort, key=lambda x,y: 0)
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186
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187 def test_stability(self):
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188 data = [(random.randrange(100), i) for i in range(200)]
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189 copy = data[:]
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190 data.sort(key=lambda t: t[0]) # sort on the random first field
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191 copy.sort() # sort using both fields
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192 self.assertEqual(data, copy) # should get the same result
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193
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194 def test_key_with_exception(self):
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195 # Verify that the wrapper has been removed
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196 data = list(range(-2, 2))
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197 dup = data[:]
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198 self.assertRaises(ZeroDivisionError, data.sort, key=lambda x: 1/x)
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199 self.assertEqual(data, dup)
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200
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201 def test_key_with_mutation(self):
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202 data = list(range(10))
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203 def k(x):
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204 del data[:]
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205 data[:] = range(20)
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206 return x
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207 self.assertRaises(ValueError, data.sort, key=k)
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208
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209 def test_key_with_mutating_del(self):
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210 data = list(range(10))
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211 class SortKiller(object):
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212 def __init__(self, x):
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213 pass
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214 def __del__(self):
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215 del data[:]
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216 data[:] = range(20)
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217 def __lt__(self, other):
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218 return id(self) < id(other)
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219 self.assertRaises(ValueError, data.sort, key=SortKiller)
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220
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221 def test_key_with_mutating_del_and_exception(self):
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222 data = list(range(10))
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223 ## dup = data[:]
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224 class SortKiller(object):
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225 def __init__(self, x):
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226 if x > 2:
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227 raise RuntimeError
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228 def __del__(self):
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229 del data[:]
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230 data[:] = list(range(20))
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231 self.assertRaises(RuntimeError, data.sort, key=SortKiller)
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232 ## major honking subtlety: we *can't* do:
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233 ##
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234 ## self.assertEqual(data, dup)
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235 ##
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236 ## because there is a reference to a SortKiller in the
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237 ## traceback and by the time it dies we're outside the call to
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238 ## .sort() and so the list protection gimmicks are out of
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239 ## date (this cost some brain cells to figure out...).
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240
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241 def test_reverse(self):
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242 data = list(range(100))
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243 random.shuffle(data)
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244 data.sort(reverse=True)
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245 self.assertEqual(data, list(range(99,-1,-1)))
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246
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247 def test_reverse_stability(self):
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248 data = [(random.randrange(100), i) for i in range(200)]
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249 copy1 = data[:]
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250 copy2 = data[:]
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251 def my_cmp(x, y):
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252 x0, y0 = x[0], y[0]
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253 return (x0 > y0) - (x0 < y0)
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254 def my_cmp_reversed(x, y):
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255 x0, y0 = x[0], y[0]
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256 return (y0 > x0) - (y0 < x0)
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257 data.sort(key=cmp_to_key(my_cmp), reverse=True)
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258 copy1.sort(key=cmp_to_key(my_cmp_reversed))
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259 self.assertEqual(data, copy1)
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260 copy2.sort(key=lambda x: x[0], reverse=True)
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261 self.assertEqual(data, copy2)
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262
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263 #==============================================================================
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264
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265 def test_main(verbose=None):
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266 test_classes = (
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267 TestBase,
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268 TestDecorateSortUndecorate,
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269 TestBugs,
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270 )
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271
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272 support.run_unittest(*test_classes)
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273
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274 # verify reference counting
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275 if verbose and hasattr(sys, "gettotalrefcount"):
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276 import gc
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277 counts = [None] * 5
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278 for i in range(len(counts)):
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279 support.run_unittest(*test_classes)
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280 gc.collect()
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281 counts[i] = sys.gettotalrefcount()
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282 print(counts)
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283
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284 if __name__ == "__main__":
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285 test_main(verbose=True)