Generator or list?

Question

Python

Hello!
There is a task to calculate the sum of digits in a string. The number is passed as an argument. The question is this. As it is preferable to do - by converting a string of numbers into a generator or a list:

import sys

print(sum((int(x) for x in sys.argv[1])))  # генератор

или

print(sum([int(x) for x in sys.argv[1]]))  # список

I would choose the first option.

Answer 1

In almost any case, it is better to use generators, as they allow you not to store or calculate unnecessary data. Lists need to be formed only when one pass is not enough.