Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_string.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 4feb10457c13
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
28009
fe10ece8ba68 Port all string tests to PyUnit and share as much tests
Walter Dörwald <walter@livinglogic.de>
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diff changeset
1 import unittest, string
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Benjamin Peterson <benjamin@python.org>
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2 from test import support
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3
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03440272028c SF Patch #1007087: Return new string for single subclass joins (Bug #1001011)
Raymond Hettinger <python@rcn.com>
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4
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5 class ModuleTest(unittest.TestCase):
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6
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7 def test_attrs(self):
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8 string.whitespace
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9 string.ascii_lowercase
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10 string.ascii_uppercase
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11 string.ascii_letters
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12 string.digits
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13 string.hexdigits
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14 string.octdigits
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15 string.punctuation
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16 string.printable
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17
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18 def test_capwords(self):
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19 self.assertEqual(string.capwords('abc def ghi'), 'Abc Def Ghi')
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20 self.assertEqual(string.capwords('abc\tdef\nghi'), 'Abc Def Ghi')
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21 self.assertEqual(string.capwords('abc\t def \nghi'), 'Abc Def Ghi')
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22 self.assertEqual(string.capwords('ABC DEF GHI'), 'Abc Def Ghi')
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23 self.assertEqual(string.capwords('ABC-DEF-GHI', '-'), 'Abc-Def-Ghi')
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24 self.assertEqual(string.capwords('ABC-def DEF-ghi GHI'), 'Abc-def Def-ghi Ghi')
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25 self.assertEqual(string.capwords(' aBc DeF '), 'Abc Def')
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26 self.assertEqual(string.capwords('\taBc\tDeF\t'), 'Abc Def')
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27 self.assertEqual(string.capwords('\taBc\tDeF\t', '\t'), '\tAbc\tDef\t')
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28
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29 def test_basic_formatter(self):
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30 fmt = string.Formatter()
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31 self.assertEqual(fmt.format("foo"), "foo")
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32 self.assertEqual(fmt.format("foo{0}", "bar"), "foobar")
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33 self.assertEqual(fmt.format("foo{1}{0}-{1}", "bar", 6), "foo6bar-6")
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34
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35 def test_conversion_specifiers(self):
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36 fmt = string.Formatter()
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37 self.assertEqual(fmt.format("-{arg!r}-", arg='test'), "-'test'-")
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38 self.assertEqual(fmt.format("{0!s}", 'test'), 'test')
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39 self.assertRaises(ValueError, fmt.format, "{0!h}", 'test')
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40 # issue13579
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41 self.assertEqual(fmt.format("{0!a}", 42), '42')
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42 self.assertEqual(fmt.format("{0!a}", string.ascii_letters),
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43 "'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'")
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44 self.assertEqual(fmt.format("{0!a}", chr(255)), "'\\xff'")
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45 self.assertEqual(fmt.format("{0!a}", chr(256)), "'\\u0100'")
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46
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47 def test_name_lookup(self):
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48 fmt = string.Formatter()
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49 class AnyAttr:
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50 def __getattr__(self, attr):
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51 return attr
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52 x = AnyAttr()
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53 self.assertEqual(fmt.format("{0.lumber}{0.jack}", x), 'lumberjack')
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54 with self.assertRaises(AttributeError):
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55 fmt.format("{0.lumber}{0.jack}", '')
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56
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57 def test_index_lookup(self):
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58 fmt = string.Formatter()
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59 lookup = ["eggs", "and", "spam"]
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60 self.assertEqual(fmt.format("{0[2]}{0[0]}", lookup), 'spameggs')
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61 with self.assertRaises(IndexError):
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62 fmt.format("{0[2]}{0[0]}", [])
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63 with self.assertRaises(KeyError):
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64 fmt.format("{0[2]}{0[0]}", {})
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65
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66 def test_override_get_value(self):
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67 class NamespaceFormatter(string.Formatter):
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68 def __init__(self, namespace={}):
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69 string.Formatter.__init__(self)
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70 self.namespace = namespace
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71
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72 def get_value(self, key, args, kwds):
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73 if isinstance(key, str):
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74 try:
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75 # Check explicitly passed arguments first
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76 return kwds[key]
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77 except KeyError:
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78 return self.namespace[key]
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79 else:
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80 string.Formatter.get_value(key, args, kwds)
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81
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82 fmt = NamespaceFormatter({'greeting':'hello'})
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83 self.assertEqual(fmt.format("{greeting}, world!"), 'hello, world!')
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84
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85
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86 def test_override_format_field(self):
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87 class CallFormatter(string.Formatter):
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88 def format_field(self, value, format_spec):
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89 return format(value(), format_spec)
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90
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91 fmt = CallFormatter()
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92 self.assertEqual(fmt.format('*{0}*', lambda : 'result'), '*result*')
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93
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94
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95 def test_override_convert_field(self):
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96 class XFormatter(string.Formatter):
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97 def convert_field(self, value, conversion):
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98 if conversion == 'x':
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99 return None
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100 return super().convert_field(value, conversion)
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101
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102 fmt = XFormatter()
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103 self.assertEqual(fmt.format("{0!r}:{0!x}", 'foo', 'foo'), "'foo':None")
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104
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105
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106 def test_override_parse(self):
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107 class BarFormatter(string.Formatter):
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108 # returns an iterable that contains tuples of the form:
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109 # (literal_text, field_name, format_spec, conversion)
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110 def parse(self, format_string):
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111 for field in format_string.split('|'):
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112 if field[0] == '+':
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113 # it's markup
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114 field_name, _, format_spec = field[1:].partition(':')
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115 yield '', field_name, format_spec, None
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116 else:
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117 yield field, None, None, None
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118
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119 fmt = BarFormatter()
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120 self.assertEqual(fmt.format('*|+0:^10s|*', 'foo'), '* foo *')
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121
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122 def test_check_unused_args(self):
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123 class CheckAllUsedFormatter(string.Formatter):
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124 def check_unused_args(self, used_args, args, kwargs):
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125 # Track which arguments actually got used
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126 unused_args = set(kwargs.keys())
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127 unused_args.update(range(0, len(args)))
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128
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129 for arg in used_args:
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130 unused_args.remove(arg)
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131
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132 if unused_args:
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133 raise ValueError("unused arguments")
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134
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135 fmt = CheckAllUsedFormatter()
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136 self.assertEqual(fmt.format("{0}", 10), "10")
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137 self.assertEqual(fmt.format("{0}{i}", 10, i=100), "10100")
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138 self.assertEqual(fmt.format("{0}{i}{1}", 10, 20, i=100), "1010020")
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139 self.assertRaises(ValueError, fmt.format, "{0}{i}{1}", 10, 20, i=100, j=0)
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140 self.assertRaises(ValueError, fmt.format, "{0}", 10, 20)
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141 self.assertRaises(ValueError, fmt.format, "{0}", 10, 20, i=100)
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142 self.assertRaises(ValueError, fmt.format, "{i}", 10, 20, i=100)
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143
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144 def test_vformat_recursion_limit(self):
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145 fmt = string.Formatter()
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146 args = ()
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147 kwargs = dict(i=100)
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148 with self.assertRaises(ValueError) as err:
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149 fmt._vformat("{i}", args, kwargs, set(), -1)
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150 self.assertIn("recursion", str(err.exception))
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151
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152
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153 def test_main():
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154 support.run_unittest(ModuleTest)
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155
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156 if __name__ == "__main__":
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157 test_main()