【逃兵】【python】罗马数字转阿拉伯数字

逃兵

def romanToInt(s):
    f = 0
    number_dict={'I':1,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000}
    temp = s
    lst = [number_dict[i] for i in temp]+[0]
    for i in range(len(lst)-1):
        if lst[i] < lst[i+1]:
            f-=lst[i]
        else:
            f+=lst[i]

    return f