写链表好费时间... class Node(object): def __init__(self, data, next=None): self.data = data self.next = next class LinkedList(object): def __init__(self, head = None): self.head = Node(head) def __len__(self): #功能:输入头节点,返回链表长度 curr = self.head counter = 1 while curr.next is not None: counter += 1 curr = cu...