Tkinter windows not responding when using update() in a while loop - user-interface

Question

I am a beginner in programming. I do this as hobby and to improve my productivity at work.
I am writing a program to automatically paste the clipboard to a Tkinter entry whenever a user copy a line of text.
I use a while loop to detect if there is a change in the current clipboard, then paste the newly copied clipboard text to the Tkinter entry.
The GUI update perfectly when I copy a new line of text.
However the GUI is not responding and I can't click the TK entry to type something that I want.
FYI I am using Python 3.5 software.
Thanks in advance.
My code:
from tkinter import *
import pyperclip
#initial placeholder
#----------------------
old_clipboard = ' '
new_clipboard = ' '
#The GUI
#--------
root = Tk()
textvar = StringVar()
label1 = Label(root, text='Clipboard')
entry1 = Entry(root, textvariable=textvar)
label1.grid(row=0, sticky=E)
entry1.grid(row=0, column=1)
#while loop
#-----------
while(True): #first while loop: keep monitoring for new clipboard
while(old_clipboard == new_clipboard): #second while loop: check if old_clipboard is equal to the new_clipboard
new_clipboard = pyperclip.paste() #get the current clipboard
print('\nold clipboard pre copy: ' + old_clipboard)
old_clipboard = new_clipboard #assign new_clipboard to old_clipboard
print('current clipboard post copy: ' + old_clipboard)
print('\ncontinuing the loop...')
textvar.set(old_clipboard) #set the current clipboard to GUI entry
root.update() #update the GUI
root.mainloop()

Answer 1

You need to put your while loop in a def, then start it in a new thread, that way your gui won´t freeze.
eg:
import threading
def clipboardcheck():
#Your while loop stuff
class clipboardthread(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
def run(self):
clipboardcheck()
clipboardthread.daemon=True #Otherwise you will have issues closing your program
clipboardthread().start()