leetcode 237 Delete Node in a Linked List python

题目：

Write a function to delete a node (except the tail) in a singly linked list, given only access to that node.

Supposed the linked list is 1 -> 2 -> 3 -> 4 and you are given the third node with value 3, the linked list should become 1 -> 2 -> 4 after calling your function.

 class Solution(object):
     def deleteNode(self, node):
         if node == None: return
         node.val = node.next.val
         node.next = node.next.next