numeralconverter.py

def is_number(s):
    try:
        float(s)
        try:
            test = int(s)
            return True
        except ValueError:
            return False
    except ValueError:
        return False

# https://github.com/Walkman100/NumeralConverter/blob/17fe334fb34088fbd7c7c25ef31fba5df8961512/Python27/numeralconverter.py#L68
def checkAndReturnRomanNumeral(input):
    if is_number(input):
        if len(input) < 6:
            return(returnRomanNumeral(int(input)))
        else:
            return("no.")
    else:
        return("\"" + input + "\" is not an Arabic number!")

def returnRomanNumeral(number):
    returnString = ""
    if number >= 1000:
        for i in range(1, (number // 1000) +1):
            returnString = returnString + "M"
        number -= (number // 1000) * 1000
    while number >= 900:
        number -= 900
        returnString = returnString + "CM"
    
    while number >= 500:
        number -= 500
        returnString = returnString + "D"
    while number >= 400:
        number -= 400
        returnString = returnString + "CD"
    
    while number >= 100:
        number -= 100
        returnString = returnString + "C"
    while number >= 90:
        number -= 90
        returnString = returnString + "XC"
    
    while number >= 50:
        number -= 50
        returnString = returnString + "L"
    while number >= 40:
        number -= 40
        returnString = returnString + "XL"
    
    while number >= 10:
        number -= 10
        returnString = returnString + "X"
    while number >= 9:
        number -= 9
        returnString = returnString + "IX"
    
    while number >= 5:
        number -= 5
        returnString = returnString + "V"
    while number >= 4:
        number -= 4
        returnString = returnString + "IV"
    
    while number >= 1:
        number -= 1
        returnString = returnString + "I"
    return("`" + returnString + "`")

def returnArabicNumber(RomanNumber):
    RomanNumber = RomanNumber.upper()
    for i in range(0, len(RomanNumber)):
        # https://stackoverflow.com/a/1228327/2999220
        if RomanNumber[i] == "I":   RomanNumber = RomanNumber[:i] + "1" + RomanNumber[i + 1:]
        elif RomanNumber[i] == "V": RomanNumber = RomanNumber[:i] + "2" + RomanNumber[i + 1:]
        elif RomanNumber[i] == "X": RomanNumber = RomanNumber[:i] + "3" + RomanNumber[i + 1:]
        elif RomanNumber[i] == "L": RomanNumber = RomanNumber[:i] + "4" + RomanNumber[i + 1:]
        elif RomanNumber[i] == "C": RomanNumber = RomanNumber[:i] + "5" + RomanNumber[i + 1:]
        elif RomanNumber[i] == "D": RomanNumber = RomanNumber[:i] + "6" + RomanNumber[i + 1:]
        elif RomanNumber[i] == "M": RomanNumber = RomanNumber[:i] + "7" + RomanNumber[i + 1:]
        else:
            return("\"" + RomanNumber[i] + "\" is not a valid Roman Numeral character!")
    # Now we have the roman number in arabic numbers (so we can use < and >), we just add it all
    ArabicNumber = 0
    RomanNumber = RomanNumber + "0" # Because loops, length calculation and next letter calculation
    for i in range(0, len(RomanNumber)):
        if i < len(RomanNumber) - 1 and RomanNumber[i] >= RomanNumber[i + 1]:
            if RomanNumber[i] == "1":   ArabicNumber += 1
            elif RomanNumber[i] == "2": ArabicNumber += 5
            elif RomanNumber[i] == "3": ArabicNumber += 10
            elif RomanNumber[i] == "4": ArabicNumber += 50
            elif RomanNumber[i] == "5": ArabicNumber += 100
            elif RomanNumber[i] == "6": ArabicNumber += 500
            elif RomanNumber[i] == "7": ArabicNumber += 1000
        elif i < len(RomanNumber) - 1:
            if RomanNumber[i] == "1":   ArabicNumber -= 1
            elif RomanNumber[i] == "2": ArabicNumber -= 5
            elif RomanNumber[i] == "3": ArabicNumber -= 10
            elif RomanNumber[i] == "4": ArabicNumber -= 50
            elif RomanNumber[i] == "5": ArabicNumber -= 100
            elif RomanNumber[i] == "6": ArabicNumber -= 500
            elif RomanNumber[i] == "7": ArabicNumber -= 1000
    return("`" + str(ArabicNumber) + "`")