StyleInCode

""" to_roman.py """

# usage: python3 to_roman.py 1979

import sys


def roman(value):
    """ value as a roman numeral """

    subs = [('IIII', 'IV'), ('IVI', 'V'), ('VIV', 'IX'), ('IXI', 'X'),
            ('XXXX', 'XL'), ('XLX', 'L'), ('LXL', 'XC'), ('XCX', 'C'),
            ('CCCC', 'CD'), ('CDC', 'D'), ('DCD', 'CM'), ('CMC', 'M')]

    output = ''
    i = value
    while i > 0:
        output += 'I'
        for x, y in subs:
            if output.endswith(x):
                output = output[:-len(x)] + y
        i -= 1
    return output


if __name__ == '__main__':
    num = int(sys.argv[1])
    print(roman(num))

""" from_roman.py """

# usage: python3 from_roman.py MCMLXXIX

import sys


def arabic(value):
    """ value as an arabic numeral """

    subs = {'$': 0, 'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'M': 1000}

    output = 0
    v = value + '$'
    for i, c in enumerate(v[:-1]):
        sign = -1 if subs[c] < subs[v[i + 1]] else 1
        output += sign * subs[c]

    return output


if __name__ == '__main__':
    num = sys.argv[1]
    print(arabic(num))