MISO coding-test-1

test1.py

# Test 1
# yonguk.choe@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.
#
# Expected result:
# $ python3.6 test1.py 123123111242342342003004400442255523 225244004004004234234234412312399999
# 123123111242342342003004400442255523 + 225244004004004234234234412312399999 = 348367115246346576237238812754655522


import sys

def print_usage_and_exit():
    print("Usage:")
    print("{} [non-negative integer] [non-negative integer]".format(sys.argv[0]))
    sys.exit(1)

def conv_str_to_non_negative_int(arg_str):
    s = arg_str.strip()
    if '.' in s in ',' or '-' in s:
        print_usage_and_exit()

    int_value = 0
    digit_count = 0
    for n in s[::-1]:
        base10 = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'].index(n)
        int_value += (base10 * (10 ** digit_count))
        digit_count += 1

    return int_value

if __name__ == '__main__':
    # two numbers as arguments test
    if len(sys.argv) != 3:
        print_usage_and_exit()

    # integer test
    int_1 = conv_str_to_non_negative_int(sys.argv[1])
    int_2 = conv_str_to_non_negative_int(sys.argv[2])

    print('{} + {} = {}'.format(int_1, int_2, (int_1 + int_2)))