Connected to the back: the inverse number sequence into a list, for example, 1234 => [4,3,2,1]. Required to achieve with recursion.
Str not allowed and the map, and then to do directly with the modulo division:
lst = []
def int_to_list(tmp:int):
division_number = tmp / 10
demo_number = tmp % 10
tmp3 = division_number - demo_number / 10
if tmp3:
int_to_list(int(tmp3))
lst.append(demo_number)
return lst
print(int_to_list(12345)[::-1])