Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test___future__.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 3c9232a684ae
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #! /usr/bin/env python3
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2 import unittest
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3 from test import support
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4 import __future__
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5
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6 GOOD_SERIALS = ("alpha", "beta", "candidate", "final")
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7
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8 features = __future__.all_feature_names
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9
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10 class FutureTest(unittest.TestCase):
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11
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12 def test_names(self):
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13 # Verify that all_feature_names appears correct.
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14 given_feature_names = features[:]
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15 for name in dir(__future__):
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16 obj = getattr(__future__, name, None)
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17 if obj is not None and isinstance(obj, __future__._Feature):
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18 self.assertTrue(
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19 name in given_feature_names,
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20 "%r should have been in all_feature_names" % name
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21 )
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22 given_feature_names.remove(name)
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23 self.assertEqual(len(given_feature_names), 0,
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24 "all_feature_names has too much: %r" % given_feature_names)
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25
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26 def test_attributes(self):
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27 for feature in features:
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28 value = getattr(__future__, feature)
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29
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30 optional = value.getOptionalRelease()
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31 mandatory = value.getMandatoryRelease()
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32
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33 a = self.assertTrue
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34 e = self.assertEqual
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35 def check(t, name):
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36 a(isinstance(t, tuple), "%s isn't tuple" % name)
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37 e(len(t), 5, "%s isn't 5-tuple" % name)
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38 (major, minor, micro, level, serial) = t
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39 a(isinstance(major, int), "%s major isn't int" % name)
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40 a(isinstance(minor, int), "%s minor isn't int" % name)
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41 a(isinstance(micro, int), "%s micro isn't int" % name)
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42 a(isinstance(level, str),
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43 "%s level isn't string" % name)
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44 a(level in GOOD_SERIALS,
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45 "%s level string has unknown value" % name)
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46 a(isinstance(serial, int), "%s serial isn't int" % name)
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47
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48 check(optional, "optional")
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49 if mandatory is not None:
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50 check(mandatory, "mandatory")
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51 a(optional < mandatory,
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52 "optional not less than mandatory, and mandatory not None")
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53
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54 a(hasattr(value, "compiler_flag"),
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55 "feature is missing a .compiler_flag attr")
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56 # Make sure the compile accepts the flag.
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57 compile("", "<test>", "exec", value.compiler_flag)
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58 a(isinstance(getattr(value, "compiler_flag"), int),
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59 ".compiler_flag isn't int")
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60
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61
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62 def test_main():
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63 support.run_unittest(FutureTest)
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64
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65 if __name__ == "__main__":
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66 test_main()