两数相加 python

class Solution:
    def addTwonumbers(self,l1:ListNode,l2:ListNode) -> ListNode:
        tempsum=0
        root =cur =ListNode(0)
        while l1 or l2 or tempsum:
            if l1: tempsum+= l1.val; l1= l1.next
            if l2: tempsum+= l2.val; l2=l2.next
            cur.next =cur = ListNode(tempsum%10)
            tempsum //=10
        return root.next

class Solution:
    def addTwonumbers(self,l1:ListNode,l2:ListNode) ->ListNode
        tempsum=0
        root =cur =ListNode(0)
        while l1 or l2 or tempsum:
            if l1: tempsum +=l1.val; l1=l1.next
            if l2: tempsum += l2.val; l2=l2.next
            cur.next =cur =ListNode(tempsum%10)
            tempsum//=10
        return root.next