[python] non-blocking Tkinter thats uses .update_idletasks()

non-blockingTkinter.py

#
# non blocking Tkinter code -> uses of .update_idletasks()
#

import time
from tkinter import *

# Function: with timeout
def mySleep():
    text.insert(INSERT, "start sleep\n")
    root.update_idletasks() # updates the Tkinter form
    time.sleep(2)
    text.insert(INSERT, "end sleep\n")

root = Tk()
# Button
b1 = Button(root, text = "call mySleep", command = mySleep)
b1.grid(row=0,column=0)
# Textfield
text = Text(root, width=20)
text.grid(row=5,column=1)

root.mainloop()