Progressbar in sub-window

progressbar_in_sub-window.py

import ctypes
import time
import threading
import tkinter
from tkinter import ttk


class ProgressbarInSubwindow(tkinter.Toplevel):
    def __init__(self, root):
        super().__init__(
            root,
        )
        self.wm_overrideredirect(True)  #remove tile bar
        self.geometry("+330+430")

        #label on sub-window
        l = tkinter.Label(
            self,
            text="now loading..."
        )
        l.pack()

        #progressbar in sub-window
        self.pb = ttk.Progressbar(self, mode="indeterminate")
        self.pb.start(5)
        self.pb.pack()

        #thread
        thread = threading.Thread(target=self.timer, args=(3,))
        thread.start()

    def timer(self, seconds):   #timer
        i = 0
        while i < seconds:
            time.sleep(1)
            i += 1
        self.destroy()  #destroy sub-window


class ShowSubWindowButton(tkinter.Button):
    def __init__(self, root):
        super().__init__(
            root,
            text = "Start!",
            command = self.show_progressbar,
        )
        self.pack()

    def show_progressbar(self):
        sub = ProgressbarInSubwindow(self)  #show sub-window


if __name__ == "__main__":
    ctypes.windll.shcore.SetProcessDpiAwareness(1)
    root = tkinter.Tk()
    root.geometry("+300+300")
    
    #label
    l = tkinter.Label(
        root,
        text="sub-window progressbar"
    )
    l.pack()

    #button to show sub-window
    sub = ShowSubWindowButton(root)
    sub.pack()

    root.mainloop()