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建立链表函数，并且赋值，链接到下一个位置的示例代码
class Node(object):
“”“单链表的结点”""
def __init__(self, item):
# item存放数据元素
self.val = item
# next是下一个节点的标识
self.next = None
node1 = Node(9)
node2 = Node(9)
node3 = Node(9)
node4 = Node(9)
node5 = Node(9)
node6 = Node(9)
node7 = Node(9)
将结点添加到链表
l1 = node1
将第一个结点的next指针指向下一结点
node1.next = node2
node2.next = node3
node3.next = node4
node4.next = node5
node5.next = node6
node6.next = node7