[Patches] [ python-Patches-941881 ] PEP309 Partial implementation

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Patches item #941881, was opened at 2004-04-25 19:05
Message generated for change (Comment added) made by pmoore
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Category: Library (Lib)
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Hye-Shik Chang (perky)
Assigned to: Nobody/Anonymous (nobody)
Summary: PEP309 Partial implementation

Initial Comment:
This patch implements functional module which is
introduced by PEP309. It has only 'partial' function as
its member in this stage.

Unittest code is copied and modified slightly from
Patch #931010 by Peter Harris.

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Comment By: Paul Moore (pmoore)
Date: 2004-04-26 20:30

Message:
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Why implement this in C? I can't imagine that the
performance improvement will be that significant. A pure
Python module in the standard library seems to me to be a
far better idea. As the PEP says, "the case for a built-in
coded in C is not very strong". And a Python module is good
self-documentation.

I prefer the function version suggested in the PEP (credited
to Carl Banks) over the class-based one. You need to take a
little care to avoid capturing argument names:

    def partial(*args, **kwds):
        def callit(*moreargs, **morekwds):
            kw = kwds.copy()
            kw.update(morekwds)
            return args[0](*(args[1:]+moreargs), **kw)
        return callit

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