python如何实现单链表的反转

# coding=utf-8
class Node:
  def __init__(self, data=None, next=None):
    self.data = data
    self.next = next


def Reserver(link):
  pre = link
  cur = link.next
  pre.next = None
  while cur:
    tmp = cur.next
    cur.next = pre
    pre = cur
    cur = tmp
  return pre


if __name__ == "__main__":
  node = Node(1, Node(2, Node(3, Node(4, Node(5, Node(6, Node(7, Node(8, Node(9)))))))))
  root = Reserver(node)

  while root:
    print root.data,
    root = root.next