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.
          """
          while node.next != None:
              node.next.val, node.val = node.val, node.next.val
              
              if node.next.next == None:
                  node.next = None
              else:
                  node = node.next
  
subject: Create solution.py