[英]Why is the following code throwing an error?
So, I am trying to define a function which would invert a binary tree, and when I run the below code, and then execute a_node.binInversion()
, I get the error which says, "NameError: name 'binInversion' is not defined".所以,我试图定义一个 function 来反转二叉树,当我运行下面的代码,然后执行a_node.binInversion()
时,我收到错误消息,“NameError: name 'binInversion' is not defined ”。 Why is that error happening?为什么会发生这种错误?
The code I'm executing is as below:我正在执行的代码如下:
class BinaryTree:
def __init__(self, value):
self.value = value
self.left = None
self.right = None
def insert_left(self, value):
if self.left == None:
self.left = BinaryTree(value)
else:
new_node = BinaryTree(value)
new_node.left = self.left
self.left = new_node
def insert_right(self, value):
if self.right == None:
self.right = BinaryTree(value)
else:
new_node = BinaryTree(value)
new_node.right = self.right
self.right = new_node
def binInversion(self):
if self.left is None and self.right is None:
return 0
else:
binInversion(self.left)
binInversion(self.right)
self.left, self.right = self.right, self.left
a_node = BinaryTree('a')
a_node.insert_left('b')
a_node.insert_right('c')
b_node = a_node.left
b_node.insert_right('d')
c_node = a_node.right
c_node.insert_left('e')
c_node.insert_right('f')
d_node = b_node.right
e_node = c_node.left
f_node = c_node.right
a_node.binInversion()
Also, I know that there are high chances of binInversion()
function not working as expected.另外,我知道binInversion()
function 很有可能无法按预期工作。 Please DO NOT disclose the solution for inverting a binary tree, as I want to give it a shot on my own before looking at the solution.请不要透露反转二叉树的解决方案,因为我想在查看解决方案之前自己试一试。
a few bugs here:这里有一些错误:
self.binInversion()
instead of binInversion()
binInversion 不是 function,它是 class 方法,记得调用self.binInversion()
而不是binInversion()
def binInversion(self, node)
to pass in another argument or node.您的 binInversion 方法不需要 arguments,尝试使用def binInversion(self, node)
之类的方法传入另一个参数或节点。
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