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Wed Oct 16 14:09:16 CEST 2013 · https://mail.python.org/pipermail/python-dev/2013-October/129627.html

Le Wed, 16 Oct 2013 14:01:37 +0200,
Victor Stinner <victor.stinner at gmail.com> a écrit :
> 2013/10/16 Antoine Pitrou <solipsis at pitrou.net>:
> >> By the way, what are the performances of contextlib.ignore()?
> >> Exceptions can be slow in some cases. Adding something even slower
> >> would not be a good idea.
> >
> > A "try" block which succeeds is fast.
> 
> Ah yes, I never reminder this fact. I try to not care too much of
> micro-optimizations :-)

It's not so much a micro-optimization than the fact that pushing a
block on the stack is very cheap.
IIRC, what is expensive is:
- creating the exception object with the associated traceback
- matching the exception in the "exception SomeException" clause

I don't have numbers, though :-)

Regards

Antoine.

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Showing content from https://mail.python.org/pipermail/python-dev/2013-October/129627.html below:

[Python-Dev] cpython: Rename contextlib.ignored() to contextlib.ignore().