[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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