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[Python-Dev] Please comment on PEP 357 -- adding nb_index slot to PyNumberMethods

Bernhard Herzog bh at intevation.de
Thu Feb 16 20:59:10 CET 2006 
"Travis E. Oliphant" <oliphant.travis at ieee.org> writes:

>     2) The __index__ special method will have the signature
>
>        def __index__(self):
>            return obj
>        
>        Where obj must be either an int or a long or another object
>        that has the __index__ special method (but not self).

So int objects will not have an __index__ method (assuming that ints
won't return a different but equal int object).  However:

>     4) A new operator.index(obj) function will be added that calls
>        equivalent of obj.__index__() and raises an error if obj does not
>        implement the special method.

So operator.index(1) will raise an exception.  I would expect
operator.index to be implemented using PyNumber_index.

   Bernhard

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