Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_tuple.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 6270946115d0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 from test import test_support, seq_tests
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2
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3 import gc
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4
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5 class TupleTest(seq_tests.CommonTest):
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6 type2test = tuple
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7
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8 def test_constructors(self):
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9 super(TupleTest, self).test_constructors()
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10 # calling built-in types without argument must return empty
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11 self.assertEqual(tuple(), ())
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12 t0_3 = (0, 1, 2, 3)
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13 t0_3_bis = tuple(t0_3)
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14 self.assertTrue(t0_3 is t0_3_bis)
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15 self.assertEqual(tuple([]), ())
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16 self.assertEqual(tuple([0, 1, 2, 3]), (0, 1, 2, 3))
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17 self.assertEqual(tuple(''), ())
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18 self.assertEqual(tuple('spam'), ('s', 'p', 'a', 'm'))
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19
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20 def test_truth(self):
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21 super(TupleTest, self).test_truth()
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22 self.assertTrue(not ())
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23 self.assertTrue((42, ))
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24
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25 def test_len(self):
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26 super(TupleTest, self).test_len()
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27 self.assertEqual(len(()), 0)
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28 self.assertEqual(len((0,)), 1)
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29 self.assertEqual(len((0, 1, 2)), 3)
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30
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31 def test_iadd(self):
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32 super(TupleTest, self).test_iadd()
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33 u = (0, 1)
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34 u2 = u
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35 u += (2, 3)
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36 self.assertTrue(u is not u2)
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37
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38 def test_imul(self):
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39 super(TupleTest, self).test_imul()
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40 u = (0, 1)
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41 u2 = u
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42 u *= 3
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43 self.assertTrue(u is not u2)
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44
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45 def test_tupleresizebug(self):
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46 # Check that a specific bug in _PyTuple_Resize() is squashed.
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47 def f():
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48 for i in range(1000):
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49 yield i
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50 self.assertEqual(list(tuple(f())), range(1000))
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51
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52 def test_hash(self):
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53 # See SF bug 942952: Weakness in tuple hash
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54 # The hash should:
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55 # be non-commutative
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56 # should spread-out closely spaced values
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57 # should not exhibit cancellation in tuples like (x,(x,y))
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58 # should be distinct from element hashes: hash(x)!=hash((x,))
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59 # This test exercises those cases.
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60 # For a pure random hash and N=50, the expected number of occupied
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61 # buckets when tossing 252,600 balls into 2**32 buckets
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62 # is 252,592.6, or about 7.4 expected collisions. The
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63 # standard deviation is 2.73. On a box with 64-bit hash
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64 # codes, no collisions are expected. Here we accept no
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65 # more than 15 collisions. Any worse and the hash function
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66 # is sorely suspect.
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67
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68 N=50
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69 base = range(N)
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70 xp = [(i, j) for i in base for j in base]
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71 inps = base + [(i, j) for i in base for j in xp] + \
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72 [(i, j) for i in xp for j in base] + xp + zip(base)
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73 collisions = len(inps) - len(set(map(hash, inps)))
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74 self.assertTrue(collisions <= 15)
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75
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76 def test_repr(self):
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77 l0 = tuple()
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78 l2 = (0, 1, 2)
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79 a0 = self.type2test(l0)
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80 a2 = self.type2test(l2)
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81
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82 self.assertEqual(str(a0), repr(l0))
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83 self.assertEqual(str(a2), repr(l2))
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84 self.assertEqual(repr(a0), "()")
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85 self.assertEqual(repr(a2), "(0, 1, 2)")
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86
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87 def _not_tracked(self, t):
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88 # Nested tuples can take several collections to untrack
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89 gc.collect()
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90 gc.collect()
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91 self.assertFalse(gc.is_tracked(t), t)
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92
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93 def _tracked(self, t):
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94 self.assertTrue(gc.is_tracked(t), t)
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95 gc.collect()
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96 gc.collect()
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97 self.assertTrue(gc.is_tracked(t), t)
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98
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99 @test_support.cpython_only
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100 def test_track_literals(self):
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101 # Test GC-optimization of tuple literals
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102 x, y, z = 1.5, "a", []
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103
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104 self._not_tracked(())
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105 self._not_tracked((1,))
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106 self._not_tracked((1, 2))
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107 self._not_tracked((1, 2, "a"))
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108 self._not_tracked((1, 2, (None, True, False, ()), int))
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109 self._not_tracked((object(),))
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110 self._not_tracked(((1, x), y, (2, 3)))
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111
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112 # Tuples with mutable elements are always tracked, even if those
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113 # elements are not tracked right now.
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114 self._tracked(([],))
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115 self._tracked(([1],))
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116 self._tracked(({},))
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117 self._tracked((set(),))
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118 self._tracked((x, y, z))
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119
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120 def check_track_dynamic(self, tp, always_track):
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121 x, y, z = 1.5, "a", []
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122
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123 check = self._tracked if always_track else self._not_tracked
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124 check(tp())
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125 check(tp([]))
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126 check(tp(set()))
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127 check(tp([1, x, y]))
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128 check(tp(obj for obj in [1, x, y]))
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129 check(tp(set([1, x, y])))
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130 check(tp(tuple([obj]) for obj in [1, x, y]))
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131 check(tuple(tp([obj]) for obj in [1, x, y]))
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132
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133 self._tracked(tp([z]))
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134 self._tracked(tp([[x, y]]))
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135 self._tracked(tp([{x: y}]))
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136 self._tracked(tp(obj for obj in [x, y, z]))
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137 self._tracked(tp(tuple([obj]) for obj in [x, y, z]))
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138 self._tracked(tuple(tp([obj]) for obj in [x, y, z]))
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139
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140 @test_support.cpython_only
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141 def test_track_dynamic(self):
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142 # Test GC-optimization of dynamically constructed tuples.
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143 self.check_track_dynamic(tuple, False)
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144
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145 @test_support.cpython_only
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146 def test_track_subtypes(self):
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147 # Tuple subtypes must always be tracked
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148 class MyTuple(tuple):
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149 pass
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150 self.check_track_dynamic(MyTuple, True)
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151
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152 @test_support.cpython_only
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153 def test_bug7466(self):
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154 # Trying to untrack an unfinished tuple could crash Python
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155 self._not_tracked(tuple(gc.collect() for i in range(101)))
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156
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157 def test_main():
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158 test_support.run_unittest(TupleTest)
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159
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160 if __name__=="__main__":
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161 test_main()