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Issue #10042: Fixed the total_ordering decorator to handle cross-type

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comparisons that could lead to infinite recursion.
This commit is contained in:
Raymond Hettinger 2011-01-08 07:01:56 +00:00
parent 06ec45e2f8
commit 23f9fc3448
4 changed files with 36 additions and 8 deletions
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24
Lib/test/test_functools.py
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@ -457,6 +457,8 @@ class TestTotalOrdering(unittest.TestCase):
self.value = value
def __lt__(self, other):
return self.value < other.value
def __eq__(self, other):
return self.value == other.value
self.assertTrue(A(1) < A(2))
self.assertTrue(A(2) > A(1))
self.assertTrue(A(1) <= A(2))
@ -471,6 +473,8 @@ class TestTotalOrdering(unittest.TestCase):
self.value = value
def __le__(self, other):
return self.value <= other.value
def __eq__(self, other):
return self.value == other.value
self.assertTrue(A(1) < A(2))
self.assertTrue(A(2) > A(1))
self.assertTrue(A(1) <= A(2))
@ -485,6 +489,8 @@ class TestTotalOrdering(unittest.TestCase):
self.value = value
def __gt__(self, other):
return self.value > other.value
def __eq__(self, other):
return self.value == other.value
self.assertTrue(A(1) < A(2))
self.assertTrue(A(2) > A(1))
self.assertTrue(A(1) <= A(2))
@ -499,6 +505,8 @@ class TestTotalOrdering(unittest.TestCase):
self.value = value
def __ge__(self, other):
return self.value >= other.value
def __eq__(self, other):
return self.value == other.value
self.assertTrue(A(1) < A(2))
self.assertTrue(A(2) > A(1))
self.assertTrue(A(1) <= A(2))
@ -524,6 +532,22 @@ class TestTotalOrdering(unittest.TestCase):
class A:
pass
def test_bug_10042(self):
@functools.total_ordering
class TestTO:
def __init__(self, value):
self.value = value
def __eq__(self, other):
if isinstance(other, TestTO):
return self.value == other.value
return False
def __lt__(self, other):
if isinstance(other, TestTO):
return self.value < other.value
raise TypeError
with self.assertRaises(TypeError):
TestTO(8) <= ()
class TestLRU(unittest.TestCase):
def test_lru(self):