# -*- coding: utf-8 -*-

# author: zhonghua

# filename: search_binarytree.py

# create: 2016/3/29

# version: 1.0

# 二叉樹查找

# 1.生成二叉樹

# 2.遍歷查找

class Node:

def __init__(self, data, left, right):

self._data = data

self._left = left

self._right = right

class BinaryTree:

def __init__(self):

self._root = None

def make_tree(self, node):

self._root = node

def insert(self, node):

def insert_node(tree_node, node):

if tree_node._data >= node._data:

if tree_node._left is None:

tree_node._left = node

else:

insert_node(tree_node._left, node)

else:

if tree_node._right is None:

tree_node._right = node

else:

insert_node(tree_node._right, node)

insert_node(self._root, node)

def search(self, data):

def search_node(tree_node, data):

if tree_node._data == data:

print 'success.'

return

elif tree_node._data >= data:

if tree_node._left is None:

return

else:

search_node(tree_node._left, data)

else:

if tree_node._right is None:

return

else:

search_node(tree_node._right, data)

search_node(self._root, data)

def pre_order(self):

lst = []

def order(node):

# print node._data

lst.append(node._data)

if node._left is not None:

order(node._left)

if node._right is not None:

order(node._right)

order(self._root)

print lst

def in_order(self):

lst = []

def order(node):

if node._left is not None:

order(node._left)

# print node._data

lst.append(node._data)

if node._right is not None:

order(node._right)

order(self._root)

print lst

def post_order(self):

lst = []

def order(node):

if node._left is not None:

order(node._left)

if node._right is not None:

order(node._right)

# print node._data

lst.append(node._data)

order(self._root)

print lst

if __name__ == '__main__':

lst = [12, 9, 7, 19, 3, 8, 52, 106, 70, 29, 20, 16, 8, 50, 22, 19]

tree = BinaryTree()

# 生成二叉樹

for (i, j) in enumerate(lst):

node = Node(j, None, None)

if i == 0:

tree.make_tree(node)

else:

tree.insert(node)

# 二叉樹查找

tree.search(70)

# 二叉樹遍歷，前序、中序、后序

tree.pre_order()

tree.in_order()

tree.post_order()

總結

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