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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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16
Lib/functools.py
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@ -68,17 +68,17 @@ def wraps(wrapped,
def total_ordering(cls):
"""Class decorator that fills in missing ordering methods"""
convert = {
'__lt__': [('__gt__', lambda self, other: other < self),
('__le__', lambda self, other: not other < self),
'__lt__': [('__gt__', lambda self, other: not (self < other or self == other)),
('__le__', lambda self, other: self < other or self == other),
('__ge__', lambda self, other: not self < other)],
'__le__': [('__ge__', lambda self, other: other <= self),
('__lt__', lambda self, other: not other <= self),
'__le__': [('__ge__', lambda self, other: not self <= other or self == other),
('__lt__', lambda self, other: self <= other and not self == other),
('__gt__', lambda self, other: not self <= other)],
'__gt__': [('__lt__', lambda self, other: other > self),
('__ge__', lambda self, other: not other > self),
'__gt__': [('__lt__', lambda self, other: not (self > other or self == other)),
('__ge__', lambda self, other: self > other or self == other),
('__le__', lambda self, other: not self > other)],
'__ge__': [('__le__', lambda self, other: other >= self),
('__gt__', lambda self, other: not other >= self),
'__ge__': [('__le__', lambda self, other: (not self >= other) or self == other),
('__gt__', lambda self, other: self >= other and not self == other),
('__lt__', lambda self, other: not self >= other)]
}
# Find user-defined comparisons (not those inherited from object).