Question

How to loop through two lists in parallel till the longest list ends with Python

Answer 1

import itertools

list1 = [1, 2, 3, 4, 5, 10, 20]
list2 = [7, 8, 9, 0, 6]

for a, b in itertools.zip_longest(list1, list2):
    print(a, b)






'''
run:

1 7
2 8
3 9
4 0
5 6
10 None
20 None

'''

 

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Answer 2

import itertools

list1 = [1, 2, 3, 4, 5]
list2 = [7, 8, 9, 12, 6, 10, 20, 30]

for a, b in itertools.zip_longest(list1, list2, fillvalue = 0):
    print(a, b)






'''
run:

1 7
2 8
3 9
4 12
5 6
0 10
0 20
0 30

'''

 

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