[Python-Dev] PEP for adding an sq_index slot so that any object, a or b, can be used in X[a:b] notation

[Travis E. Oliphant]

Attached is an updated PEP for 357.  I think the index concept is better 
situated in the PyNumberMethods structure.  That way an object doesn't 
have to define the Sequence protocol just to be treated like an index.

-Travis
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