Emmmmm，我也不知道说啥，感觉没啥说的，就当回顾吧.
# Definition for singly-linked list.
# class ListNode(object):
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution(object):
def addTwoNumbers(self, l1, l2):
"""
:type l1: ListNode
:type l2: ListNode
:rtype: ListNode
"""
result = ListNode(0)
carry = 0
p = result
while l1 and l2:
p.next = ListNode((l1.val + l2.val + carry) % 10)
carry = (l1.val + l2.val + carry) // 10
l1 = l1.next
l2 = l2.next
p = p.next
if l1:
while l1:
p.next = ListNode((l1.val + carry) % 10)
carry = (l1.val + carry) // 10
l1 = l1.next
p = p.next
if l2:
while l2:
p.next = ListNode((l2.val + carry) % 10)
carry = (l2.val + carry) // 10
l2 = l2.next
p = p.next
if carry:
p.next = ListNode(carry)
return result.next
