Ezio Melotti <ezio.melo...@gmail.com> added the comment: It would also be nice to have a __len__ method on both permutations and combinations.
len(permutations(sequence)) could return the number of permutations using the formulas (e.g. n! for permutations) without generating all the possible permutations (as opposed to something like len(list(permutations(sequence)))). Also, is there a way to calculate combinations with repetitions[1]? Maybe we could add an optional argument repetitions=True/False. [1]: http://en.wikipedia.org/wiki/Combinations#Number_of_combinations_with_repetition ---------- nosy: +ezio.melotti _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue5048> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
