/usr/lib/python3.7/test/test_contains.py is in libpython3.7-testsuite 3.7.0~b3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | from collections import deque
import unittest
class base_set:
def __init__(self, el):
self.el = el
class myset(base_set):
def __contains__(self, el):
return self.el == el
class seq(base_set):
def __getitem__(self, n):
return [self.el][n]
class TestContains(unittest.TestCase):
def test_common_tests(self):
a = base_set(1)
b = myset(1)
c = seq(1)
self.assertIn(1, b)
self.assertNotIn(0, b)
self.assertIn(1, c)
self.assertNotIn(0, c)
self.assertRaises(TypeError, lambda: 1 in a)
self.assertRaises(TypeError, lambda: 1 not in a)
# test char in string
self.assertIn('c', 'abc')
self.assertNotIn('d', 'abc')
self.assertIn('', '')
self.assertIn('', 'abc')
self.assertRaises(TypeError, lambda: None in 'abc')
def test_builtin_sequence_types(self):
# a collection of tests on builtin sequence types
a = range(10)
for i in a:
self.assertIn(i, a)
self.assertNotIn(16, a)
self.assertNotIn(a, a)
a = tuple(a)
for i in a:
self.assertIn(i, a)
self.assertNotIn(16, a)
self.assertNotIn(a, a)
class Deviant1:
"""Behaves strangely when compared
This class is designed to make sure that the contains code
works when the list is modified during the check.
"""
aList = list(range(15))
def __eq__(self, other):
if other == 12:
self.aList.remove(12)
self.aList.remove(13)
self.aList.remove(14)
return 0
self.assertNotIn(Deviant1(), Deviant1.aList)
def test_nonreflexive(self):
# containment and equality tests involving elements that are
# not necessarily equal to themselves
class MyNonReflexive(object):
def __eq__(self, other):
return False
def __hash__(self):
return 28
values = float('nan'), 1, None, 'abc', MyNonReflexive()
constructors = list, tuple, dict.fromkeys, set, frozenset, deque
for constructor in constructors:
container = constructor(values)
for elem in container:
self.assertIn(elem, container)
self.assertTrue(container == constructor(values))
self.assertTrue(container == container)
def test_block_fallback(self):
# blocking fallback with __contains__ = None
class ByContains(object):
def __contains__(self, other):
return False
c = ByContains()
class BlockContains(ByContains):
"""Is not a container
This class is a perfectly good iterable (as tested by
list(bc)), as well as inheriting from a perfectly good
container, but __contains__ = None prevents the usual
fallback to iteration in the container protocol. That
is, normally, 0 in bc would fall back to the equivalent
of any(x==0 for x in bc), but here it's blocked from
doing so.
"""
def __iter__(self):
while False:
yield None
__contains__ = None
bc = BlockContains()
self.assertFalse(0 in c)
self.assertFalse(0 in list(bc))
self.assertRaises(TypeError, lambda: 0 in bc)
if __name__ == '__main__':
unittest.main()
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