Re: [Python-Dev] [Python-3000] Iterators for dict keys , values, and items == annoying :)

[Taro Ogawa]

Taro Ogawa  gmail.com> writes: 
> Nick Coghlan  gmail.com> writes:
> > There are three big use cases:
> > ...
> 
> ...
Apologies - this was posted via gmane and the post I responded to appeared in
the gmane.comp.python.devel.3000 tree...  I'll repost there (and check gmane a
little more carefully in future).

-T.

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Re: [Python-Dev] [Python-3000] Iterators for dict keys, values, and items == annoying :)

[Taro Ogawa]

Nick Coghlan  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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