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Newsgroups: comp.lang.python
From: Ramchandra Apte <maniandra...@gmail.com>
Date: Sat, 6 Oct 2012 21:17:33 -0700 (PDT)
Local: Sun, Oct 7 2012 12:17 am
Subject: Re: try/except KeyError vs "if name in ..."
On Sunday, 7 October 2012 01:12:56 UTC+5:30, Terry Reedy wrote:
I use try and except when I need to raise exceptions e.g.:
> On 10/6/2012 7:36 AM, Dave Angel wrote: > > The distinction in performance between the success and failure modes of
> > the try/catch isn't nearly as large as one of the other responses might
> > lead you to believe. For example, a for loop generally terminates with
> > a raise (of StopIteration exception), and that doesn't convince us to
> > replace it with a while loop.
> For statement generally loop many times, up to millions of times, > without an exception being raised, whereas while statements test the > condition each time around the loop. So the rule 'if failure is rare > (less than 10-20%) use try', applies here. For if/them versus > try/except, I don't worry too much about it.
> -- > Terry Jan Reedy
try:
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