From d9c9151a53b1f0e65370da7ed08d216a5cda8062 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Wed, 21 Aug 2002 13:20:51 +0000
Subject: Now that __init__ transforms set elements, we know that all of the
 elements are hashable, so we can use dict.update() or dict.copy() for a C
 speed Set.copy().

---
 Lib/sets.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Lib/sets.py b/Lib/sets.py
index bb44280..eeef0e8 100644
--- a/Lib/sets.py
+++ b/Lib/sets.py
@@ -133,7 +133,9 @@ class BaseSet(object):
 
     def copy(self):
         """Return a shallow copy of a set."""
-        return self.__class__(self)
+        result = self.__class__([])
+        result._data.update(self._data)
+        return result
 
     __copy__ = copy # For the copy module
 
-- 
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