mirror of https://github.com/python/cpython
113 lines
3.5 KiB
Python
113 lines
3.5 KiB
Python
from collections import deque
|
|
import unittest
|
|
from test.support import NEVER_EQ
|
|
|
|
|
|
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)
|
|
msg = "argument of type 'base_set' is not a container or iterable"
|
|
with self.assertRaisesRegex(TypeError, msg):
|
|
1 in a
|
|
with self.assertRaisesRegex(TypeError, msg):
|
|
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
|
|
|
|
values = float('nan'), 1, None, 'abc', NEVER_EQ
|
|
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()
|