Add support for copy, deepcopy, and pickle.
diff --git a/Lib/rational.py b/Lib/rational.py
index 0d3ea2f..031ee0f 100755
--- a/Lib/rational.py
+++ b/Lib/rational.py
@@ -490,3 +490,18 @@
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)