Hi, if you "needs to iterate over 3 lists at the same" and according your example
> for (x1,x2,x3) in (l1,l2,l3): > print "do something with", x1, x2, x3 i has guessed that you need this (may be i was wrong): a = (1,2,3, 1) b = (4,5,6) c = (7,8,9, 2, 3) for x, y, z in zip(a, b, c): print x, y, z or this for x, y, z in map(None, a, b, c): print x,y,z Try both examples with tuples that have various length, they have difference Gal Diskin 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... > > > I was wondering if one could write this more easily in some manner > using only 1 for loop. > What I mean is something like this: > > for (x1,x2,x3) in (l1,l2,l3): > print "do something with", x1, x2, x3 > > Or maybe like this: > > for x1 in l1, x2 in l2, x3 in l3: > print "do something with", x1, x2, x3 > > However, this code obviously doesn't work... > > > I'd be very happy to receive ideas about how to do this in one loop and > with minimal initialization (if at all required). > > Thanks in advance, > Gal > -- Maksim Kasimov -- http://mail.python.org/mailman/listinfo/python-list