Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_hash.py @ 54294:dba767bc3155 legacy-trunk

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remove mention of old ctypes version
author Benjamin Peterson <benjamin@python.org>
date Sat, 23 May 2009 20:59:09 +0000
parents 5f6d225e3c1d
children 6768b2350c57
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # test the invariant that
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2 # iff a==b then hash(a)==hash(b)
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3 #
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4 # Also test that hash implementations are inherited as expected
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5
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6 import unittest
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7 from test import test_support
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8 from collections import Hashable
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11 class HashEqualityTestCase(unittest.TestCase):
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12
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13 def same_hash(self, *objlist):
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14 # Hash each object given and fail if
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15 # the hash values are not all the same.
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16 hashed = map(hash, objlist)
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17 for h in hashed[1:]:
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18 if h != hashed[0]:
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19 self.fail("hashed values differ: %r" % (objlist,))
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20
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21 def test_numeric_literals(self):
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22 self.same_hash(1, 1L, 1.0, 1.0+0.0j)
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23 self.same_hash(0, 0L, 0.0, 0.0+0.0j)
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24 self.same_hash(-1, -1L, -1.0, -1.0+0.0j)
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25 self.same_hash(-2, -2L, -2.0, -2.0+0.0j)
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26
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27 def test_coerced_integers(self):
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28 self.same_hash(int(1), long(1), float(1), complex(1),
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29 int('1'), float('1.0'))
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30 self.same_hash(int(-2**31), long(-2**31), float(-2**31))
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31 self.same_hash(int(1-2**31), long(1-2**31), float(1-2**31))
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32 self.same_hash(int(2**31-1), long(2**31-1), float(2**31-1))
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33 # for 64-bit platforms
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34 self.same_hash(int(2**31), long(2**31), float(2**31))
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35 self.same_hash(int(-2**63), long(-2**63), float(-2**63))
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36 self.same_hash(int(1-2**63), long(1-2**63))
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37 self.same_hash(int(2**63-1), long(2**63-1))
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38 self.same_hash(long(2**63), float(2**63))
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39
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40 def test_coerced_floats(self):
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41 self.same_hash(long(1.23e300), float(1.23e300))
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42 self.same_hash(float(0.5), complex(0.5, 0.0))
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44
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45 _default_hash = object.__hash__
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46 class DefaultHash(object): pass
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47
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48 _FIXED_HASH_VALUE = 42
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49 class FixedHash(object):
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50 def __hash__(self):
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51 return _FIXED_HASH_VALUE
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52
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53 class OnlyEquality(object):
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54 def __eq__(self, other):
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55 return self is other
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56 # Trick to suppress Py3k warning in 2.x
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57 __hash__ = None
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58 del OnlyEquality.__hash__
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59
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60 class OnlyInequality(object):
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61 def __ne__(self, other):
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62 return self is not other
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63
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64 class OnlyCmp(object):
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65 def __cmp__(self, other):
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66 return cmp(id(self), id(other))
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67 # Trick to suppress Py3k warning in 2.x
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68 __hash__ = None
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69 del OnlyCmp.__hash__
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71 class InheritedHashWithEquality(FixedHash, OnlyEquality): pass
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72 class InheritedHashWithInequality(FixedHash, OnlyInequality): pass
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73 class InheritedHashWithCmp(FixedHash, OnlyCmp): pass
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75 class NoHash(object):
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76 __hash__ = None
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78 class HashInheritanceTestCase(unittest.TestCase):
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79 default_expected = [object(),
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80 DefaultHash(),
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81 OnlyEquality(),
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82 OnlyInequality(),
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83 OnlyCmp(),
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84 ]
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85 fixed_expected = [FixedHash(),
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86 InheritedHashWithEquality(),
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87 InheritedHashWithInequality(),
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88 InheritedHashWithCmp(),
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89 ]
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90 error_expected = [NoHash()]
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92 def test_default_hash(self):
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93 for obj in self.default_expected:
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94 self.assertEqual(hash(obj), _default_hash(obj))
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96 def test_fixed_hash(self):
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97 for obj in self.fixed_expected:
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98 self.assertEqual(hash(obj), _FIXED_HASH_VALUE)
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100 def test_error_hash(self):
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101 for obj in self.error_expected:
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102 self.assertRaises(TypeError, hash, obj)
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103
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104 def test_hashable(self):
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105 objects = (self.default_expected +
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106 self.fixed_expected)
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107 for obj in objects:
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108 self.assert_(isinstance(obj, Hashable), repr(obj))
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109
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110 def test_not_hashable(self):
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111 for obj in self.error_expected:
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112 self.assertFalse(isinstance(obj, Hashable), repr(obj))
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113
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114
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115 # Issue #4701: Check that some builtin types are correctly hashable
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116 # (This test only used to fail in Python 3.0, but has been included
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117 # in 2.x along with the lazy call to PyType_Ready in PyObject_Hash)
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118 class DefaultIterSeq(object):
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119 seq = range(10)
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120 def __len__(self):
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121 return len(self.seq)
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122 def __getitem__(self, index):
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123 return self.seq[index]
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124
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125 class HashBuiltinsTestCase(unittest.TestCase):
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126 hashes_to_check = [xrange(10),
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127 enumerate(xrange(10)),
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128 iter(DefaultIterSeq()),
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129 iter(lambda: 0, 0),
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130 ]
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131
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132 def test_hashes(self):
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133 _default_hash = object.__hash__
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134 for obj in self.hashes_to_check:
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135 self.assertEqual(hash(obj), _default_hash(obj))
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136
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137 def test_main():
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138 test_support.run_unittest(HashEqualityTestCase,
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139 HashInheritanceTestCase,
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140 HashBuiltinsTestCase)
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141
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142
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143 if __name__ == "__main__":
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144 test_main()