On Thu, Apr 26, 2012 at 11:02 AM, Roy Smith <r...@panix.com> wrote: > I'm not seriously suggesting this as a language addition, just an interesting > idea to simplify some code I'm writing now: > > x = [a for a in iterable while a] > > which equates to: > > x = [] > for a in iterable: > if not a: > break > x.append(a) > > It does has a few things going for it. It doesn't add any new keywords, nor > does it change the meaning of any currently valid program. Whether it's > sufficiently useful in general is another question :-) In the specific case > I'm looking at now, I've got this annoying lump of code: > > valid_answers = [] > for p in pairs: > if not all(p): > break > valid_answers.append(p) > > which could be rewritten as: > > valid_answers = [p for p in pairs while all(p)] > > pairs is a list of tuples. I need the leading portion of the list where all > elements of the tuple are string non-zero-length strings. Obviously, you'd > do the corresponding generator expression as well.
valid_answers = list(itertools.takewhile(all, pairs)) -- http://mail.python.org/mailman/listinfo/python-list
