STINNER Victor <victor.stin...@haypocalc.com> added the comment:

> (b"A"*1000).find(b"A")    : -70%

This one is a performance regression introduced by #12170. Attached patch 
checks object type before trying a conversion to size_t instead of catching an 
exception.

----------
keywords: +patch
Added file: http://bugs.python.org/file24010/bytes_find.patch

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<http://bugs.python.org/issue13623>
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