Nested List Weight Sum

class Solution:
    def depthSum(self, nestedList: List[NestedInteger]) -> int:
        return self.helper(nestedList)

    def helper(self, nestedList, depth=1):
        depthSum = 0
        for element in nestedList:
            if element.isInteger():
                depthSum += depth*element.getInteger()
            else:
                depthSum += self.helper(element.getList(), depth+1)
        return depthSum