Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_dbm_gnu.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 c2f1bb56760d
children
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rev   line source
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7347d916f13a Allow skipping of regression tests not supported on windows. This reduces noise in the regression test suite for py3k on Windows.
Kristján Valur Jónsson <kristjan@ccpgames.com>
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1 from test import support
7347d916f13a Allow skipping of regression tests not supported on windows. This reduces noise in the regression test suite for py3k on Windows.
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2 gdbm = support.import_module("dbm.gnu") #skip if not supported
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3 import unittest
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4 import os
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5 from test.support import verbose, TESTFN, unlink
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7
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8 filename = TESTFN
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10 class TestGdbm(unittest.TestCase):
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11 def setUp(self):
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12 self.g = None
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14 def tearDown(self):
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15 if self.g is not None:
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16 self.g.close()
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17 unlink(filename)
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18
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19 def test_key_methods(self):
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20 self.g = gdbm.open(filename, 'c')
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21 self.assertEqual(self.g.keys(), [])
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22 self.g['a'] = 'b'
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23 self.g['12345678910'] = '019237410982340912840198242'
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24 self.g[b'bytes'] = b'data'
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25 key_set = set(self.g.keys())
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26 self.assertEqual(key_set, set([b'a', b'bytes', b'12345678910']))
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27 self.assertIn('a', self.g)
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28 self.assertIn(b'a', self.g)
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29 self.assertEqual(self.g[b'bytes'], b'data')
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30 key = self.g.firstkey()
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31 while key:
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32 self.assertIn(key, key_set)
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33 key_set.remove(key)
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34 key = self.g.nextkey(key)
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35 self.assertRaises(KeyError, lambda: self.g['xxx'])
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36 # get() and setdefault() work as in the dict interface
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37 self.assertEqual(self.g.get(b'xxx', b'foo'), b'foo')
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38 self.assertEqual(self.g.setdefault(b'xxx', b'foo'), b'foo')
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39 self.assertEqual(self.g[b'xxx'], b'foo')
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40
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41 def test_error_conditions(self):
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42 # Try to open a non-existent database.
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43 unlink(filename)
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44 self.assertRaises(gdbm.error, gdbm.open, filename, 'r')
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45 # Try to access a closed database.
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46 self.g = gdbm.open(filename, 'c')
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47 self.g.close()
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48 self.assertRaises(gdbm.error, lambda: self.g['a'])
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49 # try pass an invalid open flag
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50 self.assertRaises(gdbm.error, lambda: gdbm.open(filename, 'rx').close())
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51
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52 def test_flags(self):
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53 # Test the flag parameter open() by trying all supported flag modes.
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54 all = set(gdbm.open_flags)
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55 # Test standard flags (presumably "crwn").
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56 modes = all - set('fsu')
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57 for mode in sorted(modes): # put "c" mode first
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58 self.g = gdbm.open(filename, mode)
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59 self.g.close()
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60
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61 # Test additional flags (presumably "fsu").
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62 flags = all - set('crwn')
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63 for mode in modes:
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64 for flag in flags:
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65 self.g = gdbm.open(filename, mode + flag)
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66 self.g.close()
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67
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68 def test_reorganize(self):
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69 self.g = gdbm.open(filename, 'c')
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70 size0 = os.path.getsize(filename)
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71
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72 self.g['x'] = 'x' * 10000
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73 size1 = os.path.getsize(filename)
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74 self.assertTrue(size0 < size1)
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75
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76 del self.g['x']
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77 # 'size' is supposed to be the same even after deleting an entry.
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78 self.assertEqual(os.path.getsize(filename), size1)
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79
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80 self.g.reorganize()
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81 size2 = os.path.getsize(filename)
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82 self.assertTrue(size1 > size2 >= size0)
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83
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84 def test_context_manager(self):
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85 with gdbm.open(filename, 'c') as db:
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86 db["gdbm context manager"] = "context manager"
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87
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88 with gdbm.open(filename, 'r') as db:
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89 self.assertEqual(list(db.keys()), [b"gdbm context manager"])
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90
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91 with self.assertRaises(gdbm.error) as cm:
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92 db.keys()
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93 self.assertEqual(str(cm.exception),
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94 "GDBM object has already been closed")
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95
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96 if __name__ == '__main__':
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97 unittest.main()