zip_longest1.py

from itertools import zip_longest

iter1 = [1, 2, 3, 4, 5, 6]
iter2 = [1, 4, 9, 16, 25]
iter3 = [1, 8, 27, 64, 125]

for i in zip_longest(iter1, iter2, iter3, fillvalue = 0):
    print(i)
# OUTPUT
"""
(1, 1, 1)
(2, 4, 8)
(3, 9, 27)
(4, 16, 64)
(5, 25, 125)
(6, 0, 0)
"""