On Thu, 10 Mar 2005 13:12:31 -0800, James Stroud <[EMAIL PROTECTED]> wrote:
>Hello, > >Its not obvious to me how to do this. I would like to iterate using a tuple as >an index. Say I have two equivalently sized arrays, what I do now seems >inelegant: > >for index, list1_item in enumerate(firstlist): > do_something(list1_item, secondlist[index]) > >I would like something more like this: > >for list1_item, list2_item in (some_kind_of_expression): > do_something(list1_item, list2_item) > >Practically, I'm not so sure B is better than A, but the second would be a >little more aesthetic, to me, at least. > >Any thoughts on what "some_kind_of_expression" would be? > zip? >>> firstlist = [1,2,3] >>> secondlist = 'a b c'.split() >>> firstlist, secondlist ([1, 2, 3], ['a', 'b', 'c']) >>> for list1_item, list2_item in zip(firstlist, secondlist): ... print list1_item, list2_item ... 1 a 2 b 3 c Or if your lists are very long, you could use an iterator from itertools, e.g., >>> import itertools >>> for list1_item, list2_item in itertools.izip(firstlist, secondlist): ... print list1_item, list2_item ... 1 a 2 b 3 c Regards, Bengt Richter -- http://mail.python.org/mailman/listinfo/python-list
