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