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Generate list from other 2 lists by repeating – looking for a built-in function

May 27, 2022

Given:

date_range = ['2022-05-27','2022-05-28']
hour_range = [0,2,4,6]

I want to generate:

[
    ('2022-05-27',0),
    ('2022-05-27',2),
    ('2022-05-27',4),
    ('2022-05-27',6),
    ('2022-05-28',0),
    ('2022-05-28',2),
    ('2022-05-28',4),
    ('2022-05-28',6),
]

I tried zip(), map(), etc. which doesnt exactly get the expected output. What built-in function can I use to avoid writing multiple loops?

>Solution :

You want itertools.product():

from itertools import product
list(product(date_range, hour_range))

This outputs:

[
 ('2022-05-27', 0), ('2022-05-27', 2), ('2022-05-27', 4), ('2022-05-27', 6), 
 ('2022-05-28', 0), ('2022-05-28', 2), ('2022-05-28', 4), ('2022-05-28', 6)
]