Python TKInter destroy not working

Do this:

button['command'] = root_window.destroy # give it the function# when the button is pressed the call () is done

Do not do this:

button.bind('<Button-1>', root_window.destroy()) # () makes the call

because

root_window.destroy()

destroys the window before button.bind is called.

This is also wrong: but does not destroy the root window:

button.bind('<Button-1>', root_window.destroy)

because

the button can not be triggered with the keyboard
root_window.destroy(event) is called but root.destroy() only takes one argument.

This does also work:

button.bind('<Button-1>', lambda event: root_window.destroy())

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