how to iterate through two lists?

Question

In my python code, I have two iterable list.

num = [1, 2, 3 ,4 ,5 ,6 ,]

alpa = ['a', 'b', 'c', 'd']

for (a, b) in itertools.izip_longest(num, alpa):

   print a, b

the output:

1 a
2 b
3 c
4 d
5 None
6 None

my expected output:

1 a
2 b
3 c
4 d
5 a
6 b

How do I make it happen?

Dulicate of https://stackoverflow.com/questions/19686533/how-to-zip-two-differently-sized-lists — Barmar, Dec 21 '18 at 23:33
@Barmar: you have a python gold badge. Why can't your vote close this as a duplicate? — Sheldore, Dec 21 '18 at 23:50

score 4 · Accepted Answer · answered Dec 21 '18 at 23:34

4

You can use itertools.cycle. Here is some Python 3 code. Note that zip is used rather than izip_longest since cycle creates an infinite iterator and you want to stop when the one list is finished.

import itertools

num = [1, 2, 3, 4, 5, 6] 

alpa = ['a', 'b', 'c', 'd'] 

for (a, b) in zip(num, itertools.cycle(alpa)):

   print(a, b)

answered Dec 21 '18 at 23:34

Rory Daulton

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nice, thank you :) – Rahadian Wiratama Dec 21 '18 at 23:40

how to iterate through two lists?

1 Answers1