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Thu May 13 18:48:15 CEST 2010 · https://mail.python.org/pipermail/python-dev/2010-May/100087.html

On Thu, May 13, 2010 at 13:30, Steven D'Aprano <steve at pearwood.info> wrote:
> I'd support an immutable dict. partial objects already impose a
> significant (~ 30%) performance penalty:
>
>>>> from timeit import Timer
>>>> min(Timer('f(5)', 'f = lambda x: x').repeat())
> 0.93580079078674316
>>>> min(Timer('p(5)', 'from functools import partial; p = partial(lambda
> x: x)').repeat())
> 1.2715129852294922
>
> No need to make that worse if that can be avoided.

I've made a new patch, in which the keywords attribute is a read-only
proxy of the dictionary. I've used your benchmark, and I haven't found
any significant difference in execution times.
The patch is in the tracker (http://bugs.python.org/issue8699) and
Rietveld (http://codereview.appspot.com/1179044).

Daniel Urban

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[Python-Dev] Possible patch for functools partial