Iterating through multiple sequences
Jørgen Cederberg
jorgencederberg at hotmail.com
Thu Oct 31 05:50:42 EST 2002
"Mark Charsley" <mark.charsley at REMOVE_THIS.radioscape.com> wrote in message news:memo.20021031104532.116B at a.radioscape.com...
> In several cases recently I've wanted to iterate through two sequences at
> the same time. The way I've been doing it so far is
>
> assert(len(myList1) == len(myList2))
> for i in range(len(myList1)):
> doSomethingWith(myList1[i],myList2[i])
>
> which is a little ugly. Is there some clever idiom I'm missing that would
> simplify things? Something like
>
> for elem1,elem2 in myList1,myList2:
> doSomethingWith(elem1,elem2)
>
Instead you can use the function zip:
for elem1, elem2 in zip(mylist1, mylist2):
doSomethingWith(elem1, elem2)
zip merges the list into tuples.
/Jorgen
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