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https://leetcode-cn.com/problems/roman-to-integer/submissions/

class Solution:
    def romanToInt(self, s: str) -> int:
        s_ = ['M','CM','D','CD','C','XC','L','XL','X','IX','V','IV','I']
        v_ = [1000,900,500,400,100,90,50,40,10,9,5,4,1]
        ret = 0
        while s != '':
            for i in s_:
                if s[0:len(i)] == i:
                    ret += v_[s_.index(i)]
                    s = s[len(i):]
                    break
        return ret