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Thu Apr 5 22:15:08 CEST 2012 · https://mail.python.org/pipermail/python-dev/2012-April/118531.html

On Thu, Apr 05, 2012 at 11:56:00AM -0700, Ethan Furman wrote:
> It's only an error if it's documented that way and, more
> importantly, thought of that way.  The re module is a good example:
> if it can't find what you're looking for it returns None -- it does
> *not* raise a NotFound exception.

   But open() raises IOError. ''.find('a') returns -1 but ''.index('a')
raises ValueError.
   So we can argue in circles both ways, there are too many arguments
pro and contra. Python is just too inconsistent to be consistently
argued over. ;-)

Oleg.
-- 
     Oleg Broytman            http://phdru.name/            phd at phdru.name
           Programmers don't die, they just GOSUB without RETURN.

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[Python-Dev] an alternative to embedding policy in PEP 418 (was: PEP 418: Add monotonic clock)