Andrei wrote: >> "Smith, Jeff" <jsmith <at> medplus.com> wrote >> >>> In other words, applying somefun to the results of the iterator >>> return >>> duplicates but I want the constructed list to contain none. >>> l = [somefun(i) for i some-iterator if somefun(i) not in l] >>> >>> doesn't work (not that I expected it to). >> Why not use a Set? >> >> s = Set([somefun(i) for i in some-iterator]) >> > > Alternatively, you could put the results as keys in a dictionary, then request > mydict.keys() to get a list of unique outcomes.
While true, I wouldn't advocate that technique for any half-recent version of Python. Sets have been supported -- first as an external module, later as builtin -- since Python 2.3 (I think) with supported modules before that, which may or may not have been based on dicts. If you're *only* using a dict to remove the duplicates, better to use a set. Obviously, if you need other facilities a dict offers you, say to associate something else to your keys, then it's the best thing :) TJG _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
