问题遇到的现象和发生背景

左右子树已经有插入但是没打印出来

用代码块功能插入代码，请勿粘贴截图

1.用pycharm自带的类
from pythonds.trees import BinaryTree
r = BinaryTree('a')
r.getRootVal()
print(r.getRootVal())

r.insertLeft('b')
print(r.getLeftChild())

r.insertRight('c')
r.insertRight('e')
print(r.getRightChild)
2.编写的类

# 面向对象编程：定义一个树类

class BinaryTree():

def init(self, rootobj):

self.key = rootobj

self.leftchild = None

self.rightchild = None

def insertleft(self, newnode):

if self.leftchild == None:

self.leftchild = BinaryTree(newnode) # ?

else:

t = BinaryTree(newnode)

t.leftchild = self.leftchild

self.leftchild = t

return r

def insertright(self, newnode):

if self.rightchild is None:

self.rightchild = BinaryTree(newnode)

else:

t = BinaryTree(newnode) # BinaryTree(newnode), self.rightchild = self.rightchild, BinaryTree(newnode)

t.rightchild = self.rightchild #错误的：需要创造BinaryTree()

self.rightchild = t

return r

# 二叉树的访问函数

def getrootval(self):

return self.key

def setrootval(self, obj):

self.key = obj

def getleftchild(self):

return self.leftchild

def getrightchild(self):

return self.rightchild

这两种都不能实现左右子树的扩增

运行结果及报错内容

Connected to pydev debugger (build 213.6777.50)
a

>

Process finished with exit code 0

我想要达到的结果

成功打印我的对左右子树的扩列