Перевести строку в список

my_string = '[7, 1, 12, 72, 3, 15, 8, 13]'
my_list = []
 
temp = ''
for i in range(len(my_string)):
  if my_string[i] != ',' or my_string[i] != ' ' or my_string[i] != '[' or my_string[i] != ']':
    temp += my_string[i]
  elif temp != '':
    my_list.append(temp)
    temp = ''
 
print(my_list)

my_string = '[7, 1, 12, 72, 3, 15, 8, 13]'
print(my_string.strip())
mylist = list()
for i in my_string:
    if i.isdigit():
        i = int(i)
        mylist.append(i)
print(mylist)

>>> import ast
>>> my_string = '[7, 1, 12, 72, 3, 15, 8, 13]'
>>> lst = ast.literal_eval(my_string)
>>> lst
[7, 1, 12, 72, 3, 15, 8, 13]
>>> type(lst), type(lst[0])
(<class 'list'>, <class 'int'>)

>>> my_string = '[7, 1, 12, 72, 3, 15, 8, 13]'
>>> [int(i) for i in my_string[1:-1].split(", ")]
[7, 1, 12, 72, 3, 15, 8, 13]
>>> 
>>>

>>> my_string = '[7, 1, 12, 72, 3, 15, 8, 13]'
>>> lst = list(map(int, my_string[1:-1].split(',')))
>>> lst
[7, 1, 12, 72, 3, 15, 8, 13]

for i in range(len(my_string)):
    if my_string[i] not in  [',', ' ', '[' , ']']:  #или так:  (',', ' ', '[' , ']')
        temp += my_string[i]
    elif temp != '':
        my_list.append(temp)
        temp = ''

import re
my_string = '[7, 1, 12, 72, 3, 15, 8, 13]'
res = re.findall(r'\d+', my_string)
for i in res: 
      print(i)

import re
my_string = '[7, 1, 12, 72, 3, 15, 8, 13]'
res = re.findall(r'\d+', my_string)
for i in res: 
      print(i)

my_string = '[7, 1, 12, 72, 3, 15, 8, 13]'
eval(my_string)