At 11:55 AM 9/28/2006, Kent Johnson wrote: >Dick Moores wrote: > > I'm very interested in the data type, set. > > > > Python 2.5: > > >>> lst = [9,23,45,9,45,78,23,78] > > >>> set(lst) > > set([9, 45, 78, 23]) > > >>> s = "etywtqyertwytqywetrtwyetrqywetry" > > >>> set(s) > > set(['e', 'q', 'r', 't', 'w', 'y']) > > >>> > > > > I'm wondering if there isn't a way to get at what seems to be the > > list of unique elements set() seems to produce. For example, I would > > think it might be useful if the "list" of set([9, 45, 78, 23]) could > > be extracted, for sorting, taking the mean, etc. > >You just have to ask:
(as usual, I'm glad I did :) ) >In [1]: lst = [9,23,45,9,45,78,23,78] > >In [2]: set(lst) >Out[2]: set([9, 45, 78, 23]) > >In [3]: list(set(lst)) >Out[3]: [9, 45, 78, 23] > > > And it might be nice > > if the "list" of set(['e', 'q', 'r', 't', 'w', 'y']) could be > > converted into the sorted string, "eqrtwy". > >In [4]: s = "etywtqyertwytqywetrtwyetrqywetry" > >In [5]: ''.join(sorted(set(s))) >Out[5]: 'eqrtwy' > >The key concept is that a set is iterable - it's not a list, but in >contexts that accept an iterable it will work the same as a list. Got it. Thanks much, Kent. Dick _______________________________________________ Tutor maillist - [email protected] http://mail.python.org/mailman/listinfo/tutor
