Python iterate over two lists simultaneously [duplicate]

Question

Is there a way in python to forloop over two or more lists simultaneously?

Something like

a = [1,2,3]
b = [4,5,6]
for x,y in a,b:
    print x,y

to output

1 4
2 5
3 6

I know that I can do it with tuples like

l = [(1,4), (2,5), (3,6)]
for x,y in l:
    print x,y

Martijn Pieters · Accepted Answer · 2021-05-23 13:34:30Z

70

You can use the zip() function to pair up lists:

for x, y in zip(a, b):

Demo:

>>> a = [1,2,3]
>>> b = [4,5,6]
>>> for x, y in zip(a, b):
...     print x, y
... 
1 4
2 5
3 6

edited May 23, 2021 at 13:34

answered Jan 13, 2014 at 18:12

Martijn Pieters

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2 Comments

Martijn Pieters Over a year ago

@ilamengl: if you are going to alter answers from Python 2 to Python 3 syntax or documentation references, then do so for the question as well. Since this question is tagged, explicitly, with the python-2.7 tag I'm reverting your edit, as it is not applicable here.

Martijn Pieters Over a year ago

Python 2 support has ended, yes, but that doesn't mean that there is no one still using it. Always check the tags when reading answers, please do not change tags.

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