using class inheritance on tkinter python

Question

please help, I am trying to create a button on a tkinter window with the use of python class inheritance but it does not show the button. I am new to inheritance in python and not sure how do this. please see my code. thanks in advance

from tkinter import *

class A:
    def __init__(self):
        self.root = Tk()
        self.root.mainloop()
class B(A):
    def __init__(self):
        super().__init__()
        self.my_button = Button(self.root,text="test")
        self.my_button.pack()

d = B()

The code you posted will not produce the error you referring to. Please provide a minimal reproducible example. — Thingamabobs
– Thingamabobs, Commented Nov 29, 2022 at 4:11
It is not recommended to call mainloop() inside __init__(). For your case, super().__init__() inside class B will return only after you close the main window, then you try to create button which raises the exception. — acw1668
– acw1668, Commented Nov 29, 2022 at 4:22

acw1668 · Accepted Answer · 2022-11-29 04:52:54Z

1

It is not recommended (or should not) call tkinter mainloop() inside __init__() as mainloop() is a blocking function. Therefore super().__init__() will not return until the root window is closed. Since the button is created after super().__init__(), so the root window is blank.

Remove self.root.mainloop() inside A.__init__() and call tkinter mainloop() after you created instance of B():

from tkinter import *

class A:
    def __init__(self):
        self.root = Tk()
        # don't call mainloop() here

class B(A):
    def __init__(self):
        super().__init__()
        self.my_button = Button(self.root,text="test")
        self.my_button.pack()

d = B()
d.root.mainloop() # call mainloop() here

answered Nov 29, 2022 at 4:52

acw1668

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