new_contents: # Definition for singly-linked list.
  # class ListNode:
  #     def __init__(self, x):
  #         self.val = x
  #         self.next = None
  
  class Solution:
      # @param {ListNode} l1
      # @param {ListNode} l2
      # @return {ListNode}
      def mergeTwoLists(self, l1, l2):
          
          dumpy = ListNode(0)
          p1 = l1
          p2 = l2
          p = dumpy
          
          if p1 == None:
              return p2
          if p2 == None:
              return p1
          while p1 != None and p2 != None:
              if p1.val < p2.val:
                  p.next = p1
                  p1 = p1.next
              else:
                  p.next = p2
                  p2 = p2.next
              p = p.next
          if p1 == None:
              p.next = p2
          else:
              p.next = p1
          
          return dumpy.next
  
subject: Create Merge2SortedLs_001.py