"Gal Diskin" wrote:
> 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
how about
for x1, x2, x3 in func(l1, l2, l3):
print x1, x2, x3
where func is defined as, say,
def func(l1, l2, l3):
return ((x1, x2, x3) for x1 in l1 for x2 in l2 for x3 in l3)
or if you prefer
def helper(l1, l2, l3):
for x1 in l1:
for x2 in l2:
for x3 in l3:
yield x1, x2, x3
</F>
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