romanToInt.py

def romanToInt(str):
    table = [ ['M', 1000], ['D', 500], ['C', 100], ['L', 50], ['X', 10], ['V', 5], ['I', 1] ]
    sum = 0
    previous = 999999
    chars = str.split()
    for c in chars:
        for pair in table:
            if (pair[0] == c):
                val = pair[1]
                sum = sum + val
                if (previous < val):
                    sum = (sum - (2 * previous))
                previous = val
        
    print str, " = ", sum
    
romanToInt("VII")
romanToInt("MMIX")
romanToInt("CCXXXIX")