Ezio Melotti <ezio.melo...@gmail.com> added the comment:

What it's trying to say is that in case the operation in the "try" block 
succeeds there's almost no overhead, so it's very efficient.  On the other 
hand, raising and then catching the error is expensive.

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nosy: +ezio.melotti

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14306>
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