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[Python-Dev] PEP 469: Restoring the iterkeys/values/items() methods

Benjamin Peterson benjamin at python.org
Sat Apr 19 18:33:27 CEST 2014 
On Sat, Apr 19, 2014, at 9:30, Stephen J. Turnbull wrote:
> Guido van Rossum writes:
> 
>  > Does everyone involved know that "for x in d.iterkeys()" is
>  > equivalent to "for x in d" and works the same in Python 2 and 3? 
> [...]
> 
>  > This doesn't solve itervalues() and iteritems() but I expect those
>  > are less common, and "for x, y in d.iteritems(): <blah>" is
>  > rewritten nicely as
>  >
>  >   for x in d:
>  >     y = d[x]
>  >    <blah>
> 
> I suppose there's no way to get the compiler to both make "for x in d"
> work as above, and make "for k, v in d" be equivalent to Python 2's
> "for k, v in d.iteritems()"?  It seems totally analogous to getting
> both "for x in list" and "for x, y in list_of_couples" to DTRT.  (To
> me, anyway.)

That doesn't make sense. What if your keys are tuples?
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