[Python] Tkinter Radiobutton executes a command while already selected

In my Tkinter app, I want to execute on_choice function when selecting Radiobutton by using command=on_choice. When pressing on a radiobutton when it's already selected, the function should not be executed again. It should only be executed once after switching from another radiobutton, so the user could not repeatedly execute a function by pressing on the same radiobutton. Is there a way to prevent an execution of a command when Radiobutton is already selected?

The code:

import tkinter as tk

def on_choice():
print('Function executed')

root = tk.Tk()
root.geometry('300x150')

radiobutton_variable = tk.StringVar()
radiobutton_variable.set(1)
button_1 = tk.Radiobutton(root, text='Button 1', variable=radiobutton_variable, value=1, command=on_choice)
button_2 = tk.Radiobutton(root, text='Button 2', variable=radiobutton_variable, value=2, command=on_choice)

button_1.pack()
button_2.pack()

root.mainloop()

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