Tkinter Checkbutton not working

Question

I know this will seem like a silly question, but I have read all the related/similar questions I could find, and I am pretty sure I am experiencing a different issue. See the end of this question for a list of similar problems which I have avoided.

I am trying to use a Tkinter Checkbutton. I have used the example code from the documentation (here) almost verbatim.

from tkinter import Tk, Checkbutton, IntVar
class MyGUI:
    def __init__(self, window):
        self.var = IntVar()
        self.c = Checkbutton(window, 
                             text="Enable Tab",
                             variable=self.var,
                             command=self.cb)
        self.c.pack()

    def cb(self):
        print("self.var is", self.var.get())

root = Tk()
gui = MyGUI(root)
root.mainloop()
root.destroy()

The only thing I changed was to remove the event argument from the cb method, because as far as I could tell it wasn't being used for anything, and the checkbutton doesn't pass any event to cb.

My problem is that the variable storing the checkbutton's value always reads 0, even when the checkbutton is checked:

I don't know what I am doing wrong. I know I have avoided the following pitfalls:

• Using the wrong variable -- I have used Tk's IntVar, not a python int
• Using daft colours
• Using the same attribute name for the button and its variable -- I have saved the button and the variable as separate attributes to my class.
• Chaining the Checkbox creation with the place method and accidentally storing None

Also, when I run code from a question with a similar issue, I get the same behaviour -- checkbox always returns False/0 -- even though that question is marked as resolved.

I am using Anaconda python with the following versions:

Python 3.5.4 |Anaconda custom (64-bit)| (default, Nov  8 2017, 14:34:30) 
[MSC v.1900 64 bit (AMD64)]
IPython 6.2.1 -- An enhanced Interactive Python.

Answer 1

In case anyone has the same problem and needs a quick fix, here's my hacky solution:

from tkinter import Tk, Checkbutton, IntVar
class MyGUI:
    def __init__(self, window):
        self.var = IntVar()
        self.c = Checkbutton(
            window, text="Enable Tab",
            command=lambda:self.toggle(self.var))
        self.c.pack()

    def toggle(self, var):
        var.set(not var.get())

root = Tk()
gui = MyGUI(root)
root.mainloop()

Answer 2

chkValue = BooleanVar(root) 
chkValue.set(True)

chk = Checkbutton(root, text=' Remember Password',var=chkValue) 
chk.grid(column=1,row=3,sticky=W)

use master

• BooleanVar(master)
• IntVar(master)
• StringVar(master)

Answer 3

Your code works for me.

Maybe try to import everything from Tkinter* and delete the last line. But I think your problem is an anaconda bug.

from tkinter import *
class MyGUI:
    def __init__(self, window):
        self.var = IntVar()
        self.c = Checkbutton(window, 
                             text="Enable Tab",
                             variable=self.var,
                             command=self.cb)
        self.c.pack()

    def cb(self):
        print("self.var is", self.var.get())

if __name__ == "__main__":
    root = Tk()
    gui = MyGUI(root)
    root.mainloop()

Answer 4

this is my solution i had to do it like this you had the same problem calling inside and importing from a main file and using the class

from tkinter import Tk, Checkbutton, IntVar
class MyGUI:
    def __init__(self, window):
        self.var = IntVar()
        self.c = Checkbutton(window, 
                             text="Enable Tab",
                             variable=self.var,
                             command=self.cb)
        self.c.pack()

    def cb(self):
        if self.var.get() == 0:
           self.var.set(1)
        else:
           self.var.set(0)
        print("self.var is", self.var.get())

root = Tk()
gui = MyGUI(root)
root.mainloop()