2.py

# Definition for singly-linked list.
# class ListNode:
#     def __init__(self, x):
#         self.val = x
#         self.next = None


class ListNode:
    def __init__(self, x):
        self.val = x
        self.next = None


    
class Solution:
    def addTwoNumbers(self, l1, l2):
        """
        :type l1: ListNode
        :type l2: ListNode
        :rtype: ListNode
        """
        list1 = None
        list2 = None
        while l1.next is not None:
            list1.append[l1.val]
            l1=l1.next

        while l2.next is not None:
            list2.appendp[l2.val]
            l2=l2.next

        
        print(list1)
        print(list2)