Eighty wrote: > I suggest a new extension of the list comprehension syntax: > > [x for x in xs while cond(x)] > > which would be equivalent to > > list(itertools.takewhile(cond, xs)) > > + Since Python favors list comprehensions over map, filter, and reduce, > this would be the preferred way to do this > + "Takewhile operations" occur often, at least for me > + I don't think it would break any existing syntax > > An analogous syntax for dropwhile would be nice, but I can't think of > one. > > This is not a PEP because it's a very simple idea and probably not just > anyone (read: me) can write and submit one. If there has been a PEP for > this, I've missed it; if not, it would be nice if someone wrote one. > > Discuss.
So does no one have a comment on this? The one objection I can come up with is that this would change the set builder notation semantics too much, but since the iteration order in a list comprehension is already well defined, I don't think that would be the case. However, for this reason, it wouldn't fit in a dict comprehension, if that would ever be made, perhaps making the syntax inconsistent? -- http://mail.python.org/mailman/listinfo/python-list
