new_contents: # Definition for singly-linked list.
  # class ListNode(object):
  #     def __init__(self, x):
  #         self.val = x
  #         self.next = None
  
  class Solution(object):
      def deleteNode(self, node):
          """
          :type node: ListNode
          :rtype: void Do not return anything, modify node in-place instead.
          """
          node.val = node.next.val
          node.next = node.next.next
  
subject: add delete-node-in-a-linked-list.py