[Python-Dev] [Python-3000] Iterators for dict keys, values, and items == annoying :) (original) (raw)
Taro Ogawa taroso at gmail.com
Fri Mar 31 06:23:43 CEST 2006
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Nick Coghlan <ncoghlan gmail.com> writes:
There are three big use cases: dict.keys dict.values dict.items Currently these all return lists, which may be expensive in terms of copying. They all have iter* variants which while memory efficient, are far less convenient to work with. Is there any reason why they can't be view objects - a dictionary has keys, has values, has items - rather than methods returning view objects: for k in mydict.keys: ... for v in mydict.values: ... for k, v in mydict.items: ... For backward compatibility with Py2.x, calling them would raise a DeprecationWarning and return a list. This could even be introduced in 2.x (with a PendingDeprecationWarning instead?).
Cheers, -T.
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