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Add support for copy, deepcopy, and pickle.

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Raymond Hettinger 2008-01-25 00:21:54 +00:00
parent 909e334e8a
commit a6216749fb
2 changed files with 23 additions and 0 deletions
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15
Lib/rational.py
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@ -490,3 +490,18 @@ class Rational(RationalAbc):
def __nonzero__(a):
"""a != 0"""
return a.numerator != 0
# support for pickling, copy, and deepcopy
def __reduce__(self):
return (self.__class__, (str(self),))
def __copy__(self):
if type(self) == Rational:
return self # I'm immutable; therefore I am my own clone
return self.__class__(self.numerator, self.denominator)
def __deepcopy__(self, memo):
if type(self) == Rational:
return self # My components are also immutable
return self.__class__(self.numerator, self.denominator)