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Sun Feb 23 00:52:20 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-February/132690.html

Antoine Pitrou writes:

 > Sure, but complaining about inefficiencies without asserting their
 > significance is not very useful.

Since you completely missed the point of my post, I'll explain.  I was
in no way complaining about inefficiencies.

My point was precisely the opposite: to the extent that most 'get'
methods would be implemented in Python, even the minor inefficiency of
creating and suppressing a useless exception can't be avoided with the
LBYL of a get method, because haveattr itself is implemented by
generating and suppressing an exception.

I know that it's not a big deal[1], but it did help swing me to
positive on this PEP.

Footnotes: 
[1]  If it were, somebody would have reimplemented haveattr to avoid
generating an exception.

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Showing content from https://mail.python.org/pipermail/python-dev/2014-February/132690.html below:

[Python-Dev] PEP 463: Exception-catching expressions