答案 内容：
模板调用标记：
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深度遍历改变顺序就OK了
#coding:utf-8
#二叉树的遍历
#简单的二叉树节点类
class Node(object):
def __init__(self,value,left,right):
self.value = value
self.left = left
self.right = right
#中序遍历:遍历左子树,访问当前节点,遍历右子树
def mid_travelsal(root):
if root.left is not None:
mid_travelsal(root.left)
#访问当前节点
print(root.value)
if root.right is not None:
mid_travelsal(root.right)
#前序遍历:访问当前节点,遍历左子树,遍历右子树
def pre_travelsal(root):
print (root.value)
if root.left is not None:
pre_travelsal(root.left)
if root.right is not None:
pre_travelsal(root.right)
#后续遍历:遍历左子树,遍历右子树,访问当前节点
def post_trvelsal(root):
if root.left is not None:
post_trvelsal(root.left)
if root.right is not None:
post_trvelsal(root.right)
print (root.value)
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