iterating "by twos"

kj socyl at
Tue Jul 29 19:36:11 CEST 2008

Is there a special pythonic idiom for iterating over a list (or
tuple) two elements at a time?

I mean, other than

for i in range(0, len(a), 2):
    frobnicate(a[i], a[i+1])


I think I once saw something like

for (x, y) in forgotten_expression_using(a):
    frobnicate(x, y)

Or maybe I just dreamt it!  :)

NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.

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