[Python-Dev] Please comment on PEP 357 -- adding nb_index slot to PyNumberMethods
Georg Brandl
g.brandl at gmx.net
Fri Feb 17 11:00:26 CET 2006
Bernhard Herzog wrote:
> "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.
I'd expect that __index__ won't be called on an int in the first place.
Georg
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