ขั้นตอนการเขียนโค้ด · เลขโรมันรูปแบบมาตรฐาน

def roman_numeral(n):
    if type(n) is not int or not 1 <= n <= 3999:
        raise ValueError("roman.range")
    values = [(1000,"M"),(900,"CM"),(500,"D"),(400,"CD"),
              (100,"C"),(90,"XC"),(50,"L"),(40,"XL"),
              (10,"X"),(9,"IX"),(5,"V"),(4,"IV"),(1,"I")]
    parts = []
    for value, symbol in values:
        count, n = divmod(n, value)
        parts.append(symbol * count)
    return "".join(parts)