[Python-Dev] Allowing slicing of iterators (original) (raw)
Nick Coghlan ncoghlan at iinet.net.au
Tue Jan 25 14:41:32 CET 2005
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Batista, Facundo wrote:
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 | ncoghlan at email.com | Brisbane, Australia
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