Add Strings LeetCode solution in Python

1
class Solution:
2
    def addStrings(self, num1: str, num2: str) -> str:
3
        def func(n):
4
            value = {
5
                "0": 0,
6
                "1": 1,
7
                "2": 2,
8
                "3": 3,
9
                "4": 4,
10
                "5": 5,
11
                "6": 6,
12
                "7": 7,
13
                "8": 8,
14
                "9": 9,
15
            }
16
            result = 0
17
            for digit in n:
18
                result = 10 * result + value[digit]
19

20
            return result
21

22
        ans = func(num1) + func(num2)
23
        return str(ans)