[Python-Dev] [Python-3000] Iterators for dict keys, values, and items == annoying :)
taroso at gmail.com
Fri Mar 31 06:23:43 CEST 2006
Nick Coghlan <ncoghlan <at> gmail.com> writes:
> There are three big use cases:
> 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?).
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