CODEWITHSUNDEEP
pythontkinter
katek1094
katek1094

Reputation: 92

Tkinter object has no attribute, sometimes work, sometimes no?

I have code like below (simplified), I can not run refresh method of Root widget, but I have the same system in a different program and it works. I wrote it 3 times in different files and sometimes it works, and sometimes does not. Maybe I am doing something wrong about creating this attr self.a, so please tell me how to do it so it would work always.

Error:

AttributeError: '_tkinter.tkapp' object has no attribute 'a'

from tkinter import *

class Window(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent)
        Label(self, text="some text").pack()
        self.master.refresh()

class Root(Tk):
    def __init__(self):
        Tk.__init__(self)

        self.a = Window(self)
        self.a.pack()
        self.mainloop()

    def refresh(self):
        self.a.destroy()
        self.a = Window(self)
        self.a.pack()

Root()

Upvotes: 1

Views: 569

Answers (1)

Thingamabobs
Thingamabobs

Reputation: 8042

Your code works, just your structure do not. Hope you can deal with a button.

from tkinter import *

class Window(Frame):
    def __init__(self, master):
        Frame.__init__(self, master)
        Label(self, text="some text").pack()
        b = Button(self, text='refresh', command =lambda:self.master.refresh())
        b.pack()


class Root(Tk):
    def __init__(self):
        Tk.__init__(self)

        self.a = Window(self)
        self.a.pack()
        self.mainloop()

    def refresh(self):
        self.a.destroy()
        self.a = Window(self)
        self.a.pack()

Root()

edit

from tkinter import *
#this is the tricky version, lambda will not show any error if a error occurs

class Root(Tk):
    def __init__(self):
        Tk.__init__(self)

        self.a = Window(self)
        self.a.pack()
        self.mainloop()

    def refresh(self):
        self.a.destroy()
        self.a = Window(self)
        self.a.pack()

def function():
    print('I am the executing function')
class Window(Frame):
    def __init__(self, master):
        Frame.__init__(self, master)
        Label(self, text="some text").pack()
        b = Button(self, text='refresh', command =lambda:[self.master.refresh(),self.func(), function()])        
        b.pack()
    def func(self):
        print('I am the executing func')


Root()

from tkinter import *
#this is the safer exampel, cause if a error occurs you will notice.

class Root(Tk):
    def __init__(self):
        Tk.__init__(self)

        self.a = Window(self)
        self.a.pack()
        self.mainloop()

    def refresh(self):
        self.a.destroy()
        self.a = Window(self)
        self.a.pack()

class Window(Frame):
    def __init__(self, master):
        Frame.__init__(self, master)
        Label(self, text="some text").pack()
        b = Button(self, text='refresh', command =self.func)
        b.pack()
    def func(self):
        self.master.refresh()

Root()

Upvotes: 2

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