Hi Alan G, thanks for your quick answer. The copy of my code below, sent on 18/09/15 16:41 is for some reasons incomplete. It should read
>>> import string, itertools >>> s = ['ab','ac','bc','ad','ae','de'] >>> count = 0 >>> for startlist in itertools.combinations(s, 3): >>> count = count + 1 >>> stl = list(startlist) >>> print count, stl >>> for pair in s: >>> x = stl.count(pair) >>> print x, pair My task is to have lists containing 3 tuples, each tuple ocurring only once. In my code above I started off with 6 tuples ( = s) of which 20 lists (count) are produced containing each of the 6 tuples multiple times. Therefore, I try to write additional code for eliminating all lists which contain tuples occuring more than once. If I use all 325 tuples I would first get many thousand lists. Your code proposal uses dictionaries. If I used dictionaries with all the 325 possible tuples I would have to do a lot of typing and not getting lists with 3 tuples in it. So, I am stuck somehow and hope to have made my tasks clear. Thanks for further help, Marcus. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ -----Ursprüngliche Nachricht----- Von: Tutor [mailto:tutor-bounces+marcus.luetolf=bluewin...@python.org] Im Auftrag von Alan Gauld Gesendet: Freitag, 18. September 2015 18:58 An: tutor@python.org Betreff: Re: [Tutor] Creating lists with 3 (later4) items occuring only once On 18/09/15 16:41, marcus lütolf wrote: >>>> s = ['ab','ac','bc','ad','ae','de'] for startlist in >>>> itertools.combinations(s, 3): > How can I concatenate the 20 lists in oder to get one count for each of the > items in s , for example 10 for 'ab'? If I understand you correctly, something like this: >>> counts = {'ab':0,'ac':0,'bc':0,'ad':0,'ae':0,'de':0} >>> for combo in it.combinations(counts.keys(),3): ... for pair in combo: ... counts[pair] += 1 ... >>> counts {'ac': 10, 'ab': 10, 'ae': 10, 'ad': 10, 'bc': 10, 'de': 10} Is that what you want? -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor --- Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. https://www.avast.com/antivirus _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
