Test #1

test1.py

#!/usr/bin/env python3.8
#
# Test #1
# smuminov@gmail.com
# 
# Write a command-line program that prints out the sum of two non-negative integers as input arguments. 
# You must not use any built-in BigInteger library or convert the inputs to integer directly.
import sys


def calc_sum(num1: str, num2: str) -> str:
    result = ""
    if len(num1) > len(num2):
        num1, num2 = num2, num1

    diff = len(num2) - len(num1)
    num1 = "0" * diff + num1

    carry = 0
    for i, j in zip(num1[::-1], num2[::-1]):
        cur = ord(i) + ord(j) - 2 * ord("0") + carry
        carry = cur // 10
        result = str(cur % 10) + result
    return "1" + result if carry else result


def main():
    if len(sys.argv) == 3:
        n1 = sys.argv[1]
        n2 = sys.argv[2]
        if n1 and n2:
            print(calc_sum(n1, n2))


if __name__ == "__main__":
    main()