Window and buttons

from tkinter import *
window = Tk()

def button1_func():
    print("Hello World!")

def button2_func():
    print("Goodbye World!")

button1 = Button(window, text="Click", command=button1_func)
button2 = Button(window, text="Click2", command=button2_func)

#Add the button to the window.
button1.pack()
button2.pack()