심심해서 만들어본 예상 투자수익 계산기

import sys

def do(money, years, profit, add_money):
    print("inputed money :", money, end=", ")
    print("inputed years :", years, end=", ")
    print("inputed profit :", profit)
    result = money

    for year in range(1, int(years)+1):
        result += result * profit
        print(f"After {year} year: {result}")
        result += add_money

    return result - add_money

if __name__ == "__main__":
    param = {
        'm': 0,     # money
        'y': 0,     # years
        'p': 0.0,   # profit
        'a': 0,  # add_money
    }

    is_called_help = False
    for arg in sys.argv[1:]:
        if arg == 'help':
            print("usage : python3 calculator.py m={invest cost} y={invest period} p={profit per year} a={add_money_per_year")
            is_called_help = True
            break

        if '=' in arg:
            key, value = arg.split('=')
            param[key] = value

    if not is_called_help:
        print("total : ", do(money=int(param['m']), years=int(param['y']),
                             profit=float(param['p']), add_money=int(param['a']))
              )