["python","list","iterator"]
Iterate over all pairs of consecutive items in a list

Given a list l = [1, 7, 3, 5] I want to iterate over all pairs of consecutive list items (1,7), (7,3), (3,5), i.e. for i in xrange(len(l) - 1): x = l[i] y = l[i + 1] # do something I would like to do this in a more compact way, like for x, y in someiterator(l): ... Is there a way to do do this using builtin Python iterators? I'm sure the itertools module should have a solution, but I just can't figure it out.
Just use zip >>> l = [1, 7, 3, 5] >>> for first, second in zip(l, l[1:]): ... print(first, second) ... 1 7 7 3 3 5 If you use Python 2 (not suggested) you might consider using the izip function in itertools for very long lists where you don't want to create a new list. import itertools for first, second in itertools.izip(l, l[1:]): ...