How to do it...

The following application shows how to create Checkbutton, which must be connected to an IntVar variable to be able to inspect the button state:

import tkinter as tk

class SwitchApp(tk.Tk):
    def __init__(self):
        super().__init__() 
        self.var = tk.IntVar() 
        self.cb = tk.Checkbutton(self, text="Active?",  
                                 variable=self.var, 
                                 command=self.print_value) 
        self.cb.pack() 
 
    def print_value(self): 
        print(self.var.get()) 
 
if __name__ == "__main__": 
    app = SwitchApp() 
    app.mainloop() 

In the preceding code, we simply printed the value of the widget each time it is clicked: