From: Raymond Hettinger <python@rcn.com>
Date: Fri, 25 Jan 2008 00:21:54 +0000 (+0000)
Subject: Add support for copy, deepcopy, and pickle.
X-Git-Tag: v2.6a1~418
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a6216749fb88fb508cd469839d77d4264a881bd4;p=python

Add support for copy, deepcopy, and pickle.
---

diff --git a/Lib/rational.py b/Lib/rational.py
index 0d3ea2f04f..031ee0f20e 100755
--- a/Lib/rational.py
+++ b/Lib/rational.py
@@ -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)
diff --git a/Lib/test/test_rational.py b/Lib/test/test_rational.py
index 3242e43886..20abce26df 100644
--- a/Lib/test/test_rational.py
+++ b/Lib/test/test_rational.py
@@ -6,6 +6,8 @@ import math
 import operator
 import rational
 import unittest
+from copy import copy, deepcopy
+from cPickle import dumps, loads
 R = rational.Rational
 
 def _components(r):
@@ -359,6 +361,12 @@ class RationalTest(unittest.TestCase):
             s += num / fact * sign
         self.assertAlmostEquals(math.cos(1), s)
 
+    def test_copy_deepcopy_pickle(self):
+        r = R(13, 7)
+        self.assertEqual(r, loads(dumps(r)))
+        self.assertEqual(id(r), id(copy(r)))
+        self.assertEqual(id(r), id(deepcopy(r)))
+
 def test_main():
     run_unittest(RationalTest)