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Raymond Hettinger 2005-06-28 08:46:39 +00:00
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pep-0323.txt
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@ -7,7 +7,7 @@ Status: Draft
Type: Standards Track
Content-Type: text/plain
Created: 25-Oct-2003
Python-Version: 2.4
Python-Version: 2.5
Post-History: 29-Oct-2003
@ -19,6 +19,18 @@ Abstract
might exploit such a __copy__ method when present.
Update and Comments
Support for __copy__ was included in Py2.4's itertools.tee().
Adding __copy__ methods to existing iterators will change the
behavior under tee(). Currently, the copied iterators remain
tied to the original iterator. If the original advances, then
so do all of the copies. Good practice is to overwrite the
original so that anamolies don't result: a,b=tee(a).
Code that doesn't follow that practice may observe a semantic
change if a __copy__ method is added to an iterator.
Motivation
In Python up to 2.3, most built-in iterator types don't let the user