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.
1 class Solution(object): 2 def deleteNode(self, node): 3 if node == None: return 4 node.val = node.next.val 5 node.next = node.next.next