how can i create a list from lager list and only 3 number position in to new list in Python

how can i create a list from lager list and only 3 number position in to new list in Python

list = (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21)

Can it be like this?

list = (1,5,9,12,15,18,21)

>Solution :

First time contributing here but this will do it:

my_list = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21]

new_list = []

for i in range(0, len(my_list) + 1, 3):
    new_list.append(i)

print(new_list)