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119 lines
3.7 KiB
119 lines
3.7 KiB
2 years ago
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import unittest
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from test.support import ALWAYS_EQ
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class Empty:
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def __repr__(self):
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return '<Empty>'
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class Cmp:
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def __init__(self,arg):
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self.arg = arg
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def __repr__(self):
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return '<Cmp %s>' % self.arg
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def __eq__(self, other):
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return self.arg == other
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class ComparisonTest(unittest.TestCase):
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set1 = [2, 2.0, 2, 2+0j, Cmp(2.0)]
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set2 = [[1], (3,), None, Empty()]
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candidates = set1 + set2
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def test_comparisons(self):
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for a in self.candidates:
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for b in self.candidates:
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if ((a in self.set1) and (b in self.set1)) or a is b:
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self.assertEqual(a, b)
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else:
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self.assertNotEqual(a, b)
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def test_id_comparisons(self):
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# Ensure default comparison compares id() of args
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L = []
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for i in range(10):
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L.insert(len(L)//2, Empty())
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for a in L:
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for b in L:
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self.assertEqual(a == b, id(a) == id(b),
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'a=%r, b=%r' % (a, b))
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def test_ne_defaults_to_not_eq(self):
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a = Cmp(1)
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b = Cmp(1)
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c = Cmp(2)
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self.assertIs(a == b, True)
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self.assertIs(a != b, False)
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self.assertIs(a != c, True)
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def test_ne_high_priority(self):
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"""object.__ne__() should allow reflected __ne__() to be tried"""
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calls = []
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class Left:
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# Inherits object.__ne__()
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def __eq__(*args):
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calls.append('Left.__eq__')
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return NotImplemented
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class Right:
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def __eq__(*args):
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calls.append('Right.__eq__')
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return NotImplemented
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def __ne__(*args):
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calls.append('Right.__ne__')
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return NotImplemented
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Left() != Right()
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self.assertSequenceEqual(calls, ['Left.__eq__', 'Right.__ne__'])
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def test_ne_low_priority(self):
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"""object.__ne__() should not invoke reflected __eq__()"""
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calls = []
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class Base:
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# Inherits object.__ne__()
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def __eq__(*args):
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calls.append('Base.__eq__')
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return NotImplemented
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class Derived(Base): # Subclassing forces higher priority
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def __eq__(*args):
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calls.append('Derived.__eq__')
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return NotImplemented
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def __ne__(*args):
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calls.append('Derived.__ne__')
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return NotImplemented
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Base() != Derived()
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self.assertSequenceEqual(calls, ['Derived.__ne__', 'Base.__eq__'])
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def test_other_delegation(self):
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"""No default delegation between operations except __ne__()"""
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ops = (
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('__eq__', lambda a, b: a == b),
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('__lt__', lambda a, b: a < b),
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('__le__', lambda a, b: a <= b),
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('__gt__', lambda a, b: a > b),
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('__ge__', lambda a, b: a >= b),
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)
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for name, func in ops:
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with self.subTest(name):
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def unexpected(*args):
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self.fail('Unexpected operator method called')
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class C:
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__ne__ = unexpected
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for other, _ in ops:
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if other != name:
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setattr(C, other, unexpected)
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if name == '__eq__':
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self.assertIs(func(C(), object()), False)
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else:
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self.assertRaises(TypeError, func, C(), object())
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def test_issue_1393(self):
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x = lambda: None
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self.assertEqual(x, ALWAYS_EQ)
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self.assertEqual(ALWAYS_EQ, x)
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y = object()
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self.assertEqual(y, ALWAYS_EQ)
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self.assertEqual(ALWAYS_EQ, y)
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if __name__ == '__main__':
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unittest.main()
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