Serhiy Storchaka added the comment:
It would be better discuss such ideas on python-ideas mailing list
(http://mail.python.org/mailman/listinfo/python-ideas).
Option 3 breaks existing code such as
for k, v in d.items():
if pred(k, v):
d[k] = newvalue
break
Option 1 is memory inefficient. It requires a list of iterators in every dict
(well, in almost every dict). And it doesn't look more time efficient than
option 2.
Implementation of option 2 was provided and rejected in issue19332.
----------
nosy: +rhettinger, serhiy.storchaka
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