Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_dynamic.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents aa632943b8bd
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
59654
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1 # Test the most dynamic corner cases of Python's runtime semantics.
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2
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3 import builtins
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4 import contextlib
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5 import unittest
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6
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7 from test.support import run_unittest, swap_item, swap_attr
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8
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9
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10 class RebindBuiltinsTests(unittest.TestCase):
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11
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12 """Test all the ways that we can change/shadow globals/builtins."""
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13
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14 def configure_func(self, func, *args):
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15 """Perform TestCase-specific configuration on a function before testing.
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16
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17 By default, this does nothing. Example usage: spinning a function so
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18 that a JIT will optimize it. Subclasses should override this as needed.
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19
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20 Args:
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21 func: function to configure.
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22 *args: any arguments that should be passed to func, if calling it.
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23
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24 Returns:
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25 Nothing. Work will be performed on func in-place.
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26 """
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27 pass
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28
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29 def test_globals_shadow_builtins(self):
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30 # Modify globals() to shadow an entry in builtins.
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31 def foo():
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32 return len([1, 2, 3])
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33 self.configure_func(foo)
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34
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35 self.assertEqual(foo(), 3)
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36 with swap_item(globals(), "len", lambda x: 7):
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37 self.assertEqual(foo(), 7)
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38
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39 def test_modify_builtins(self):
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40 # Modify the builtins module directly.
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41 def foo():
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42 return len([1, 2, 3])
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43 self.configure_func(foo)
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44
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45 self.assertEqual(foo(), 3)
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46 with swap_attr(builtins, "len", lambda x: 7):
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47 self.assertEqual(foo(), 7)
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48
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49 def test_modify_builtins_while_generator_active(self):
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50 # Modify the builtins out from under a live generator.
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51 def foo():
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52 x = range(3)
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53 yield len(x)
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54 yield len(x)
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55 self.configure_func(foo)
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56
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57 g = foo()
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58 self.assertEqual(next(g), 3)
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59 with swap_attr(builtins, "len", lambda x: 7):
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60 self.assertEqual(next(g), 7)
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61
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62 def test_modify_builtins_from_leaf_function(self):
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63 # Verify that modifications made by leaf functions percolate up the
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64 # callstack.
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65 with swap_attr(builtins, "len", len):
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66 def bar():
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67 builtins.len = lambda x: 4
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68
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69 def foo(modifier):
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70 l = []
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71 l.append(len(range(7)))
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72 modifier()
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73 l.append(len(range(7)))
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74 return l
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75 self.configure_func(foo, lambda: None)
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76
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77 self.assertEqual(foo(bar), [7, 4])
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78
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79 def test_cannot_change_globals_or_builtins_with_eval(self):
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80 def foo():
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81 return len([1, 2, 3])
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82 self.configure_func(foo)
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83
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84 # Note that this *doesn't* change the definition of len() seen by foo().
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85 builtins_dict = {"len": lambda x: 7}
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86 globals_dict = {"foo": foo, "__builtins__": builtins_dict,
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87 "len": lambda x: 8}
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88 self.assertEqual(eval("foo()", globals_dict), 3)
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89
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90 self.assertEqual(eval("foo()", {"foo": foo}), 3)
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91
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92 def test_cannot_change_globals_or_builtins_with_exec(self):
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93 def foo():
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94 return len([1, 2, 3])
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95 self.configure_func(foo)
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96
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97 globals_dict = {"foo": foo}
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98 exec("x = foo()", globals_dict)
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99 self.assertEqual(globals_dict["x"], 3)
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100
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101 # Note that this *doesn't* change the definition of len() seen by foo().
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102 builtins_dict = {"len": lambda x: 7}
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103 globals_dict = {"foo": foo, "__builtins__": builtins_dict,
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104 "len": lambda x: 8}
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105
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106 exec("x = foo()", globals_dict)
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107 self.assertEqual(globals_dict["x"], 3)
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108
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109 def test_cannot_replace_builtins_dict_while_active(self):
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110 def foo():
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111 x = range(3)
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112 yield len(x)
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113 yield len(x)
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114 self.configure_func(foo)
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115
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116 g = foo()
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117 self.assertEqual(next(g), 3)
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118 with swap_item(globals(), "__builtins__", {"len": lambda x: 7}):
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119 self.assertEqual(next(g), 3)
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120
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121 def test_cannot_replace_builtins_dict_between_calls(self):
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122 def foo():
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123 return len([1, 2, 3])
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124 self.configure_func(foo)
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125
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126 self.assertEqual(foo(), 3)
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127 with swap_item(globals(), "__builtins__", {"len": lambda x: 7}):
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128 self.assertEqual(foo(), 3)
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129
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130 def test_eval_gives_lambda_custom_globals(self):
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131 globals_dict = {"len": lambda x: 7}
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132 foo = eval("lambda: len([])", globals_dict)
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133 self.configure_func(foo)
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134
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135 self.assertEqual(foo(), 7)
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136
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137
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138 def test_main():
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139 run_unittest(RebindBuiltinsTests)
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140
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141
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142 if __name__ == "__main__":
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143 test_main()