human
Solve the following python programming problem given the following code:
# 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
        """
        dummy = ListNode(0)
        p = dummy
        carry = 0
        while True:
            if l1 is not None:
                carry += l1.val
                l1 = l1.next
            if l2 is not None:
                carry += l2.val
                l2 = l2.next
            p.val = carry % 10
            carry /= 10
            if l1 is not None or l2 is not None or carry != 0:
                temp = ListNode(0)
                p.next = temp
                p = p.next
            else:
                break
        
        return dummy
Given the above code, generate some markdown instructions for it.
assistant
#Here is the Python code you requested.

Add Two Numbers
http://www.lintcode.com/en/problem/add-two-numbers/
https://leetcode.com/problems/add-two-numbers/description/