The itertools module (http://docs.python.org/library/itertools.html) has both permutations and combinations functionality.
Chris On Mon, Sep 20, 2010 at 1:54 PM, Seth Leija <fazzit...@gmail.com> wrote: > I need to know how to generate a list of combinations/permutations > (can't remember which it is). Say I have a list of variables: > > [a,b,c,d,...,x,y,z] > > I am curious if there is an optimized way to generate this: > > [[a,b],[a,c],[a,d],...,[x,z],[y,z]] > > I currently have an iteration that does this: > > #list.py > > from math import * > > list1=['a','b','c','d','e'] > list2=[] > length=len(list1) > > for it1 in range(0 ,length): > for it2 in range(it1+1, length): > list2.append([list1[it1],list1[it2]]) > > print list2 > > However, this is one of the slowest parts of my function (beaten only > by variable instantiation). I posted this on another forum looking to > see if there was a different method completely. They said that my > method was about as simple as it could get, but I might be able to > find out how to optimize my code here. > > Thanks in advance. > -- > http://mail.python.org/mailman/listinfo/python-list >
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