15-8. Radiobutton widget

Radiobutton widgets are generated using the Radiobutton class from the tkinter module. They operate as mutually exclusive options, meaning only one Radiobutton within a container can be selected at any particular moment.

The IntVar class is a component of the tkinter module that works in tandem with Radiobutton widgets. It facilitates the assignment of unique integers to each Radiobutton. When a Radiobutton is selected, its respective unique integer is stored within the IntVar object.

For example,

from tkinter import *
from tkinter import messagebox

class FirstGUI:
    def __init__(self):

self.main_window = Tk()
        self.main_window.geometry('400x200')

self.top_frame = Frame(self.main_window)
        self.bottom_frame = Frame(self.main_window)
        
        self.radio_var = IntVar()
        self.radio_var.set(1)

self.rb1 = Radiobutton(self.top_frame, text='Python',
                               variable=self.radio_var, value=1)
        self.rb2 = Radiobutton(self.top_frame, text='Java',
                               variable=self.radio_var, value=2)
        self.rb3 = Radiobutton(self.top_frame, text='C++',
                               variable=self.radio_var, value=3)

self.rb1.pack()
        self.rb2.pack()
        self.rb3.pack()

self.ok_button = Button(self.bottom_frame,text='OK',
                                command=self.display)
        self.quit_button = Button(self.bottom_frame, text='Quit',
                                command=self.main_window.destroy)

self.ok_button.pack(side='left')
        self.quit_button.pack(side='left')

self.top_frame.pack()
        self.bottom_frame.pack()
        
        mainloop()
    
    def display(self):
        messagebox.showinfo('Selected option', str(self.radio_var.get()) 
                            + ' is selected.')

if __name__ == '__main__':
    FirstGUI()

Output:

Radio buttons labeled “Python,” “Java,” and “C++” are displayed. On the next line, the “OK” and “Quit” buttons are shown. Python radio button is chosen. Pop up Window with 1 is selected is shown.

Last updated: April 22, 2025

Python Programming

15-8. Radiobutton widget