How to make tkinter's window not show "not responding" when click at window

Question

While my code is running after click run button in tkinter's window,it will show "not responding" when i click it . How to make it not respond when click and show loading progress? This is loading code that i use.

from tkinter import *
from tkinter.ttk import *
import time
window = Tk()
window.geometry("400x200")
percent = StringVar()
text = StringVar()
def start():
    def task():
        bar['value']=0
        GB = 100
        download = 0
        speed = 1
        while(download<GB):
            time.sleep(0.05)
            bar['value']+=(speed/GB)*100
            download+=speed
            percent.set(str(int((download/GB)*100))+"%")
            text.set(str(download)+"/"+str(GB)+" GB completed")
            window.after(2000, None)
            window.update_idletasks()
        window.after(1, task)
    window.after(100, task)

bar = Progressbar(window,orient=HORIZONTAL,length=300)
bar.pack(pady=10)
percentLabel = Label(window,textvariable=percent).pack()
taskLabel = Label(window,textvariable=text).pack()
button = Button(window,text="download",command=start).pack()
window.mainloop()    

Answer 1

Try this:

import tkinter as tk
from tkinter import ttk

window = tk.Tk()
window.geometry("400x200")
percent = tk.StringVar(master=window)
text = tk.StringVar(master=window)

def start():
    download = 0
    def task(download):
        bar["value"] = download
        GB = 100
        speed = 1
        if download <= GB:
            bar["value"] += (speed/GB)*100
            percent.set(str(int((download/GB)*100))+"%")
            text.set(str(download)+"/"+str(GB)+" GB completed")
        window.after(1000, task, download+1)
    window.after(1000, task, 0)

bar = ttk.Progressbar(window,orient="horizontal", length=300)
bar.pack(pady=10)
percentLabel = tk.Label(window, textvariable=percent)
percentLabel.pack()
taskLabel = tk.Label(window, textvariable=text)
taskLabel.pack()
button = tk.Button(window, text="download", command=start)
button.pack()
window.mainloop()  

Answer 2

I've taken function task out of start and implemented a Button disable in order to prevent multiple button presses.

Also made the update percent and download output code for version 2.x and 3.x

try:
    import tkinter as tk
    from tkinter import ttk
except ImportError:
    # Can't test it but according to this: https://stackoverflow.com/a/23984633/11106801
    import Tkinter as tk
    import ttk

window = tk.Tk()
window.geometry("400x200")
percent = tk.StringVar(master=window)
text = tk.StringVar(master=window)

def task(download):
    bar['value'] = download
    GB = 100
    speed = 1
    if GB >= download:
        bar['value'] += speed/GB*100
        percent.set("{} %".format(int(download/GB*100)))
        text.set("{} / {}  GB completed".format(download, GB))
    window.after(100, task, download+1)

def start():
    button.config(state="disabled")
    task(0)

bar = ttk.Progressbar(window, orient="horizontal", length=300)
bar.pack(pady=10)

percentLabel = tk.Label(window, textvariable=percent)
percentLabel.pack()

taskLabel = tk.Label(window, textvariable=text)
taskLabel.pack()

button = tk.Button(window, text="download", command=start)
button.pack()

window.mainloop()