Guido van Rossum <gu...@python.org> added the comment:

As I wrote in python-dev:

I agree with Raymond that this should be treated as a feature request and not 
"fixed" in 2.7 / 3.2. (However the mention of 'find' in the error message for 
'index' is a bug and should be fixed.)

As for the feature request, I think that allowing None in more places is more 
regular and consistent across interfaces. I note that the slice() object also 
represents "missing" or "default" values as None, so it is not just a carryover 
from the old string.py.

So, +1 on the feature for 3.3; -1 on the "fix" in 3.2 or 2.7.

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nosy: +gvanrossum

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<http://bugs.python.org/issue11828>
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