I think that breaking the common idiom...
for e in something[:]: something.remove(e)
is a no-no...
The patch doesn't change existing behaviour - anything which is already sliceable (e.g. lists) goes through the existing __getitem__ or __getslice__ code paths.
All the patch adds is two additional checks (the first for an iterator, the second for an iterable) before PyObject_GetItem fails with the traditional "TypeError: unsubscriptable object".
Defining __getitem__ also allows any given iterator or iterable type to override the default slicing behaviour if they so choose.
Regards, Nick.
--
Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia
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http://boredomandlaziness.skystorm.net
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