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

2014年2月22日 15:54:07 -0800

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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