How to Leave the Python Tkinter Button Input Function

What can I do if I want to remove the function that I am updating canvas by entering it from the button?

def update():
   canvas.after(10, update)

to a function similar to the one shown in

 if (button press or key input):
    return

The goal is to add .
I would appreciate it if you could let me know if there are any functions to determine whether or not the button has been clicked.