Le Thu, 8 Jan 2009 11:51:01 -0800 (PST), culpritNr1 <ig2ar-s...@yahoo.co.uk> a écrit :
> > Hi All, > > Say I have this nice list of lists: > > LoL = [['chrX', '160944034', '160944035', 'gnfX.145.788', '63.60'], > ['chrX', '161109992', '161109993', 'rs13484104', '63.60'], > ['chrX', '161414112', '161414113', 'rs13484105', '63.60'], > ['chrX', '161544071', '161544072', 'rs13484106', '63.60'], > ['chrX', '162030736', '162030737', 'gnfX.146.867', '67.05'], > ['chrX', '164171913', '164171914', 'gnfX.148.995', '70.45']] > > Now I want to cast the second and third "columns" from string to integer, > like this > > LoL = [['chrX', 160944034, 160944035, 'gnfX.145.788', '63.60'], > ['chrX', 161109992, 161109993, 'rs13484104', '63.60'], > ['chrX', 161414112, 161414113, 'rs13484105', '63.60'], > ['chrX', 161544071, 161544072, 'rs13484106', '63.60'], > ['chrX', 162030736, 162030737, 'gnfX.146.867', '67.05'], > ['chrX', 164171913, 164171914, 'gnfX.148.995', '70.45']] > > Is there any elegant way to do this? I can't assume that all lines will have > the same number of elements. In you do not need checking whether specific items are "castable" (i.e. you really know what's in the list) you may use such a pattern: lol = [[1,2,3],[4,5,6],[7,8,9]] new_lol = [[a,b**3,c] for [a,b,c] in lol] print lol print new_lol ==> [[1, 2, 3], [4, 5, 6], [7, 8, 9]] [[1, 8, 3], [4, 125, 6], [7, 512, 9]] denis > Thank you, > > Your Culprit > > ------ la vida e estranya _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
