Method addTwoNumbers

leetcode/2. Add Two Numbers.py:12–26

(self, l1, l2)

class Solution(object):
    def addTwoNumbers(self, l1, l2):
        pNode = ListNode(0)
        pHead = pNode
        val = 0
        while l1 or l2 or val:
            if l1:
                val += l1.val
                l1 = l1.next
            if l2:
                val += l2.val
                l2 = l2.next
            pNode.next = ListNode(val % 10)
            val /= 10
            pNode = pNode.next
        return pHead.next