Python 属性错误:';非类型';对象没有属性';儿童';在uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

Python 属性错误:';非类型';对象没有属性';儿童';在uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu,python,tkinter,parent,children,attributeerror,Python,Tkinter,Parent,Children,Attributeerror,我刚从tkinter开始,就被一个我自己解决不了的问题绊倒了: 我想自己写一个小部件,我称之为pocket。在我的窗口中,哪一部分是有效的,可以滑动打开或隐藏 class pocket(tk.Frame): def __init__(self, parent, master=None, expand_Bool=True): tk.Frame.__init__(self, parent) self.master = master self.C

我刚从tkinter开始,就被一个我自己解决不了的问题绊倒了:
我想自己写一个小部件,我称之为pocket。在我的窗口中,哪一部分是有效的,可以滑动打开或隐藏

class pocket(tk.Frame):
    def __init__(self, parent, master=None, expand_Bool=True):
        tk.Frame.__init__(self, parent)
        self.master = master
        self.Content = tk.Frame(self)        
        self.Button_on = tk.Button(self,text='Open',command=lambda: self.expand())
        self.Button_hide = tk.Button(self,text='Hide',command=lambda: self.hide())
        self.Content.grid(row=1,column=0)
        self.Button_on.grid(row=0,column=0)
        self.Button_hide.grid(row=0,column=0)
        if expand_Bool:
            self.expand()
        else:
            self.hide()

    def expand(self):
        self.Button_on.grid_remove()
        self.Button_hide.grid()
        self.Content.grid()
    def hide(self):
        self.Button_on.grid()
        self.Button_hide.grid_remove()
        self.Content.grid_remove()
    def get_contentframe(self):
        return self.Content



if __name__=='__main__':
    root=tk.Tk()

    pocket1 =pocket(root)
    pocket1.grid(row=0,column=0)
    label1=tk.Label(pocket1.get_contentframe(),text='Text')
    label1.grid(row=1,column=1)
    root.mainloop()
“小部件”本身工作得很好。但当我试图关闭窗口时,会收到一条错误消息:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\...\tkinter\__init__.py", line 1699, in __call__
    return self.func(*args)
  File "C:\...\tkinter\__init__.py", line 2055, in destroy
    for c in list(self.children.values()): c.destroy()
  File "C:\...\tkinter\__init__.py", line 2300, in destroy
    if self._name in self.master.children:
AttributeError: 'NoneType' object has no attribute 'children'
我怎样才能避免那个错误呢?或者有更好的方法吗?
提前感谢。
问候语问题是

self.master = master
坦白说,当你执行

tk.Frame.__init__(self, parent)
然后它自动创建变量
self.master
,并分配
parent

self.master = parent
你不必这么做


在你的代码中,
master
None
,所以最后你得到了

self.master = None
因此,它失去了对
父项的访问权限,并且在尝试关闭子项时出现问题


完整代码

import tkinter as tk

class Pocket(tk.Frame):

    def __init__(self, master=None, expand_bool=True):
        tk.Frame.__init__(self, master)

        self.content = tk.Frame(self)        
        self.button_on = tk.Button(self, text='Open', command=self.expand)
        self.button_hide = tk.Button(self, text='Hide', command=self.hide)
        self.content.grid(row=1, column=0)
        self.button_on.grid(row=0, column=0)
        self.button_hide.grid(row=0, column=0)

        if expand_bool:
            self.expand()
        else:
            self.hide()

    def expand(self):
        self.button_on.grid_remove()
        self.button_hide.grid()
        self.content.grid()

    def hide(self):
        self.button_on.grid()
        self.button_hide.grid_remove()
        self.content.grid_remove()

    def get_contentframe(self):
        return self.content

if __name__=='__main__':
    root = tk.Tk()

    pocket1 = Pocket(root)
    pocket1.grid(row=0, column=0)

    label1 = tk.Label(pocket1.get_contentframe(), text='Text')
    label1.grid(row=1, column=1)

    root.mainloop()
问题是

self.master = master
坦白说,当你执行

tk.Frame.__init__(self, parent)
然后它自动创建变量
self.master
,并分配
parent

self.master = parent
你不必这么做


在你的代码中,
master
None
,所以最后你得到了

self.master = None
因此,它失去了对
父项的访问权限,并且在尝试关闭子项时出现问题


完整代码

import tkinter as tk

class Pocket(tk.Frame):

    def __init__(self, master=None, expand_bool=True):
        tk.Frame.__init__(self, master)

        self.content = tk.Frame(self)        
        self.button_on = tk.Button(self, text='Open', command=self.expand)
        self.button_hide = tk.Button(self, text='Hide', command=self.hide)
        self.content.grid(row=1, column=0)
        self.button_on.grid(row=0, column=0)
        self.button_hide.grid(row=0, column=0)

        if expand_bool:
            self.expand()
        else:
            self.hide()

    def expand(self):
        self.button_on.grid_remove()
        self.button_hide.grid()
        self.content.grid()

    def hide(self):
        self.button_on.grid()
        self.button_hide.grid_remove()
        self.content.grid_remove()

    def get_contentframe(self):
        return self.content

if __name__=='__main__':
    root = tk.Tk()

    pocket1 = Pocket(root)
    pocket1.grid(row=0, column=0)

    label1 = tk.Label(pocket1.get_contentframe(), text='Text')
    label1.grid(row=1, column=1)

    root.mainloop()

您是否使用
tkinter.after()
threads
?您可能必须在关闭程序之前停止它们。BWT:相反,
command=lambda:self.expand()
您可以执行
command=self.expand
(没有
lambda
()
)顺便说一句,
self.master
确实是
的,那么,为什么您希望它有一个名为
children
的属性呢?您是使用
tkinter.after()
还是
threads
?您可能必须在关闭程序之前停止它们。BWT:相反,
command=lambda:self.expand()
您可以执行
command=self.expand
(没有
lambda
()
)顺便说一句,
self.master
确实是
None
,那么您为什么希望它有一个名为
children的属性呢?