Method romanToInt

leetcode/13. Roman to Integer.py:10–19

(self, s)

class Solution(object):
    def romanToInt(self, s):
        romanDict = {'M':1000, 'D':500, 'C':100, 'L':50, 'X':10, 'V':5, 'I':1}
        res, p = 0, 'I'
        for ch in s[::-1]:
            if romanDict[ch] < romanDict[p]:
                res = res - romanDict[ch]
            else:
                res = res + romanDict[ch]
            p = ch
        return res

s = Solution()
print((s.romanToInt("IX")))