[issue4424] Add support for a cmp, or key argument to heapq functions.

[Alex]

Alex <alex.gaynor at gmail.com> added the comment:

Apologies, searching didn't yield that.  That's not necessarily always
easy, for example I'd like to use heapq to merge iterators coming from
the database.

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<http://bugs.python.org/issue4424>
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