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? Similarly, "list(d)" is
a simple, fast way to spell the Python 2 semantics of "d.keys()" that
works in both versions (but I doubt it is much needed -- usually the actual
code follows up with sorting, so you should use sorted(d)).
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>
If there is a measurable slowdown in the latter I would be totally okay
with some kind of one-element cache for the most recent lookup.
I get the social aspect of the PEP, but I think it's too high a price to
pay.
--
--Guido van Rossum (python.org/~guido)
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