leetcode 682. Baseball Game

class Solution:
    def calPoints(self, ops: List[str]) -> int:
        record=[]
        for i in ops :
            if i.isnumeric() : record.append(int(i))
            if i[0]=='-' : record.append(int(i[1:])*-1)
            if i == 'C': record.pop()
            if i == 'D': record.append(record[-1]*2)
            if i == '+': record.append(record[-1]+record[-2])
        return (sum(record))