tk5_radiobutton.py

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import tkinter as tk

window = tk.Tk()
window.title('my window')
window.geometry('200x200')

var = tk.StringVar()
l = tk.Label(window, bg='yellow', width=20, text='empty')
l.pack()

def print_selection():
    l.config(text='you have selected ' + var.get())

r1 = tk.Radiobutton(window, text='Option A',
                    variable=var, value='A',
                    command=print_selection)
r1.pack()
r2 = tk.Radiobutton(window, text='Option B',
                    variable=var, value='B',
                    command=print_selection)
r2.pack()
r3 = tk.Radiobutton(window, text='Option C',
                    variable=var, value='C',
                    command=print_selection)
r3.pack()


window.mainloop()