二叉树的实现

# _*_ coding :utf-8 -*_
import os
class Node(object):
def __init__(self,v = None,left = None,right = None,parent = None):
self.value = v
self.left =left
self.right = right
self.parent = parent

class BTree(object):
def __init__(self):
self.root = None
self.size = 0

def insert(self,node):
n = self.root
if n == None:
self.root = node
return
while True:
if node.value <= n.value:
if n.left == None:
node.parent = n
n.left = node
break
else:
n = n.left

if node.value > n.value:
if n.right == None:
n.parent = n
n.right = node
break
else:
n = n.right

def find (self,v):
n = self.root
while True :
if n == None:
return None
if v == n.value:
return n
if v < n.value:
n = n.left
continue
if v > n.value:
n = n.right

def find_suceess (node):
assert node != None and node.right != None
n = node.right
while m.left != None:
n = n.left
return n

def delete(self,v):
n = self.find(v)
print "delete :",n.value
del_parent = n.parent
if del_parent == None:
self.root = None;
return
if n != None:
if n.left != None and n.right != None :
succ_node = find_success(n)
parent = succ_node.parent
if succ_node == parent.left :
parent.left = None
if succ_node == parent.right:
parent.right = None
if del_parent.left == n :
del_parent.left = succ_node
if del_parent.right == n:
del_parent.right = succ_node
succ_node.parent = n.parent
succ_node.left = n.left
succ_node.right = n.right

del n
elif n.left != None or n.right != None:
if n.left != None:
node = n.left
else:
node = n.right
node.parent = n.parent

if del_parent.left == n:
del_parent.left = node
if del_parent.right == n:
del_parent.right = node
del n
else:
if del_parent.left == n :
del_parent.left = None
if del_parent.right == n:
del_parent.right = None

def tranverse(self):
def pnode(node):
if node == None:
return
if node.left != None:
pnode(node.left)
print node.value

if node.right != None:
pnode(node.right)

pnode(self.root)

def getopts():
import optparse,locale
parser = optparse.OptionParser()
parser .add_option("-i","--input",dest = 'input',help = u"help name",metaver = "INPUT")
(options,args) = parser.parse_args()

return (options.input)

if __name__ == '__main__':
a1 = [23,45,67,12,78,90,11,33,55,66,89,76,85,51,70]
bt = BTree()
for x in a1:
bt.insert(Node(x))
bt.delete(12)
bt.tranverse()
n = bt.find(12)
if n != None :
print "find value:" ,n.value

运行结果：

>>>
delete : 12
11
23
33
45
51
55
66
67
70
76
78
85
89
90
>>>