In article <[EMAIL PROTECTED]>, "Gal Diskin" <[EMAIL PROTECTED]> wrote:
> Hi, > I am writing a code that needs to iterate over 3 lists at the same > time, i.e something like this: > > for x1 in l1: > for x2 in l2: > for x3 in l3: > print "do something with", x1, x2, x3 > > What I need to do is go over all n-tuples where the first argument is > from the first list, the second from the second list, and so on... Take a look at http://mail.python.org/pipermail/python-list/2001-September/104983.html or http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/159975 There's nothing magic about either -- fundamentally, you're still doing an N^3 operation and it's going to be slow. You might want to stop and think if there's some better algorithm than an exhaustive search of the entire domain space for whatever it is that you're trying to do. -- http://mail.python.org/mailman/listinfo/python-list
