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Make Fraction(-1).__hash__() return -2 rather than -1 (see issue 10356).

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This commit is contained in:
Mark Dickinson 2010-11-13 10:27:38 +00:00
parent 24854cac99
commit fec6620dfb
3 changed files with 9 additions and 6 deletions
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9
Lib/fractions.py
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@ -528,12 +528,8 @@ class Fraction(numbers.Rational):
return Fraction(round(self / shift) * shift)
def __hash__(self):
"""hash(self)
"""hash(self)"""
Tricky because values that are exactly representable as a
float must have the same hash as that float.
"""
# XXX since this method is expensive, consider caching the result
# In order to make sure that the hash of a Fraction agrees
@ -550,7 +546,8 @@ class Fraction(numbers.Rational):
hash_ = _PyHASH_INF
else:
hash_ = abs(self._numerator) * dinv % _PyHASH_MODULUS
return hash_ if self >= 0 else -hash_
result = hash_ if self >= 0 else -hash_
return -2 if result == -1 else result
def __eq__(a, b):
"""a == b"""