本文实例讲述了Python实现树的先序、中序、后序排序算法。分享给大家供大家参考，具体如下：
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#encoding=utf-8
class Tree():
def __init__(self,leftjd=0,rightjd=0,data=0):
self.leftjd = leftjd
self.rightjd = rightjd
self.data = data
class Btree():
def __init__(self,base=0):
self.base = base
#前序遍历 根左右
def qout(self,jd):
if jd == 0:
return
print jd.data
self.qout(jd.leftjd)
self.qout(jd.rightjd)
#中序遍历 左根右
def mout(self,jd):
if jd == 0:
return
self.mout(jd.leftjd)
print jd.data
self.mout(jd.rightjd)
#后序遍历 左右根
def hout(self,jd):
if jd == 0:
return
self.hout(jd.leftjd)
self.hout(jd.rightjd)
print jd.data
jd1 = Tree(data=8)
jd2 = Tree(data=9)
base = Tree(jd1,jd2,7)
x = Btree(base)
x.qout(x.base)
print '\r\n'
x.mout(x.base)
print '\r\n'
x.hout(x.base)
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希望本文所述对大家Python程序设计有所帮助。