from gpiozero import Button
from signal import pause
import tkinter as tk
from tkinter import Label, ttk

def say_hello():
    print("Hello!")

button = Button(16)
                
guiDisplay = tk.Label(root, text=guiDisp, font=("None", 20))
guiDisplay.grid(column=0, row=1, padx=5, pady=5)

button.when_pressed = say_hello

pause()