[Python] How to bind Raspberry's GPIO events to invoke TTK buttons?

Here is the code that works with keyboard events. I'd like to do the same with gpio State changes instead of key_press events. Thks :

from tkinter import *
from tkinter import ttk
import keyboard

root = Tk()

def p():
print('hello')

BUT_Quitter = ttk.Button ( root , text = "Quitter" , command = root.destroy )
BUT_Quitter.pack ( )
BUT_display = ttk.Button ( root , text = "Hello" , command = p )
BUT_display.pack ( )

def key_press(event):
key = event.char
if key=='q':
BUT_display.invoke()

root.bind('<Key>', key_press)

root.mainloop ( )


PS : without threading

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