Aahz <[EMAIL PROTECTED]> wrote: > In article <[EMAIL PROTECTED]>, > Alex Martelli <[EMAIL PROTECTED]> wrote: > > > >list(iterimage(etc etc)) > > > >is surely a better way to express identical semantics. More generally, > >[x for x in whatever] (whether x is a single name or gets peculiarly > >unpacked and repacked like here) is a good example of inappropriate LC, > >to get back to the question in the subject: list(whatever) is the "one > >obvious way" to perform the same task. > > Except of course, when it's > > [x for x in whatever if x] > > I'm exceedingly fond of replacing filter() with listcomps. They're so > much more readable and often faster.
Sure, if there are other clauses in the LC (be they for or if ones) you can't just call list(...) -- and I do entirely agree that filter can be put out to pasture. Similarly, you need the LC if you're performing some processing on the items -- for example, if you have an iterator yielding pairs, [(y,x) for x,y in whatever] you do need the unpacking and repacking to achieve this swapping of items within each pair -- what I was pointing out was re the simpler and most common case: [(x,y) for x,y in whatever] no processing needed, no if clauses, etc, and thus better expressed as list(whatever) Alex -- http://mail.python.org/mailman/listinfo/python-list
