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| author | Mark Dickinson <dickinsm@gmail.com> | 2010-11-13 10:27:38 (GMT) |
|---|---|---|
| committer | Mark Dickinson <dickinsm@gmail.com> | 2010-11-13 10:27:38 (GMT) |
| commit | fec6620dfb9b7e99b68c07b623235f87f5fd1a60 (patch) | |
| tree | 36c6d0c627256a1dd1efb9d866e232271336d77b /Lib/fractions.py | |
| parent | 24854cac996ebe2f534cbe58b141fe51fd2d8d0e (diff) | |
| download | cpython-fec6620dfb9b7e99b68c07b623235f87f5fd1a60.zip cpython-fec6620dfb9b7e99b68c07b623235f87f5fd1a60.tar.gz cpython-fec6620dfb9b7e99b68c07b623235f87f5fd1a60.tar.bz2 | |
Make Fraction(-1).__hash__() return -2 rather than -1 (see issue 10356).
Diffstat (limited to 'Lib/fractions.py')
| -rw-r--r-- | Lib/fractions.py | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/Lib/fractions.py b/Lib/fractions.py index 51e67e2..8be52d2 100644 --- a/Lib/fractions.py +++ b/Lib/fractions.py @@ -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""" |