cpython/Lib/test/test_compare.py
Guido van Rossum e27dc72308 By default, != returns the opposite of ==, unless the latter returns
NotImplemented.

(Is this worth backporting to 2.6?  It seems so useful...!)
2007-03-27 22:37:34 +00:00

53 lines
1.3 KiB
Python

import sys
import unittest
from test import test_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 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)
self.assertTrue(a == b)
self.assertFalse(a != b)
def test_main():
test_support.run_unittest(ComparisonTest)
if __name__ == '__main__':
test_main()