pyRomanNumeralsToInteger

# Convert Roman Numerals To Integer
# Mike Kerry - December 2020 - acclivity2@gmail.com


def convert_roman_to_int(s):
    roman = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}
    result, prev = 0, 0
    for x in range(len(s)):
        if roman[s[x]] > prev:
            result -= 2*prev        # e.g. IX we had already added 1 but should have deducted 1
        result += roman[s[x]]
        prev = roman[s[x]]
    return result


tests = ["MMDCXL", "MCCCLXIX", "CDXXXVIII"]

for t in tests:
    ps = convert_roman_to_int(t)
    print(t, " = ", ps)


# Results:-
# MMDCXL  =  2640
# MCCCLXIX  =  1369
# CDXXXVIII  =  438