Tkinter оставляет окно не отвечает после уничтожения

Question

Я написал следующий код для синхронизации c моего рабочего пространства с моим FTP-сервером:

import ftplib
import time
import tkinter as tk
import sys
import os, os.path
import argparse
import threading
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

class FTPFSHandler(FileSystemEventHandler):
    def __init__(self, ftp, args):
        self.ftp = ftp
        self.args = args
    def on_created(self, event):
        print(f'event type: {event.event_type}  path : {event.src_path}')
        print(f'\033[32;1mNew File will be written to: \033[34;1m{event.src_path}\033[0m')
        cur = self.ftp.pwd()
        print(cur)
        print(event.src_path)
        if not cur == '/' + os.path.dirname(event.src_path):
            self.ftp.cwd(os.path.dirname(event.src_path))
        try:
            self.ftp.storbinary('STOR %s' % (os.path.basename(event.src_path)), open(event.src_path, 'rb'))
        except IsADirectoryError:
            self.ftp.mkd('/' + event.src_path)
        self.ftp.cwd(cur)
    def on_deleted(self, event):
        print(f'event type: {event.event_type}  path : {event.src_path}')
        print(f'\033[31;1mFile will be deleted at: \033[34;1m{event.src_path}\033[0m')
        cur = self.ftp.pwd()
        print(cur)
        print(event.src_path)
        try:
            if not cur == '/' + os.path.dirname(event.src_path):
                self.ftp.cwd(os.path.dirname(event.src_path))
            self.ftp.delete(os.path.basename(event.src_path))
        except ftplib.error_perm:
            if not cur == '/' + '/'.join(event.src_path.split('/')[:(len(event.src_path.split('/')) - 1)]):
                self.ftp.cwd('/' + '/'.join(event.src_path.split('/')
                                            [:(len(event.src_path.split('/')) - 1)]))
            self.ftp.rmd(event.src_path.split(
                '/')[len(event.src_path.split('/'))-1])
        self.ftp.cwd(cur)
    def on_modified(self, event):
        time.sleep(1)
        print(f'event type: {event.event_type}  path : {event.src_path}')
        print(f'\033[32;1mFile will be updated at: \033[34;1m{event.src_path}\033[0m')
        cur = self.ftp.pwd()
        print(cur)
        print(event.src_path)
        try:
            if not cur == '/' + os.path.dirname(event.src_path):
                self.ftp.cwd(os.path.dirname(event.src_path))
            self.ftp.storbinary('STOR %s' % (os.path.basename(event.src_path)), open(event.src_path, 'rb'))
        except:
            pass


def is_file(filename):
    current = ftp.pwd()
    try:
        ftp.cwd(filename)
    except:
        ftp.cwd(current)
        return True
    ftp.cwd(current)
    return False

class Login():
    def __init__(self):
        self.root = tk.Tk()
        self.root.geometry("480x200+0+0")
        self.create_widgets()
        self.root.mainloop()

    def create_widgets(self):
        self.l = tk.Label(self.root, text="Log in", font=('Arial', 44))
        self.l.pack()
        self.l1 = tk.Label(self.root, text="FTP Username:")
        self.l1.pack()
        self.e = tk.Entry(self.root)
        self.e.pack()
        self.l2 = tk.Label(self.root, text="FTP Password:")
        self.l2.pack()
        self.p = tk.Entry(self.root, show="\u25CF")
        self.p.pack()
        self.b = tk.Button(self.root, text="Log In", command=self.logon)
        self.b.pack()

    def logon(self):
        self.password = self.p.get()
        self.uname = self.e.get()
        self.root.destroy()


x = Login()
try:                                #Ensure That a username and Password were entered
    print("Username: " + x.uname)
except:
    sys.exit(1)

def createfiles(ftp, b='.', ignore=[], bdir='..'):
    files = ftp.nlst()
    print(files)
    for f in files:
        rf = b + '/' + f
        if f.startswith('.') or rf in ignore:
            continue
        if is_file(f):
            if not os.path.isfile(rf):
                o = open(rf, 'wb')
                print('\033[32;1mWriting file in directory: \033[34;1m' + ftp.pwd() + '\033[0m')
                ftp.retrbinary('RETR %s' % f, o.write)
                o.close()
        else:
            if not os.path.isdir(rf):
                os.mkdir(rf)
                ftp.cwd(f)
                try:
                    createfiles(ftp, rf, '..')
                except:
                    pass
                try:
                    ftp.cwd(bdir)
                except:
                    pass

parser = argparse.ArgumentParser()
parser.add_argument('--base', '-b', help="the working directory on the server")
parser.add_argument('--ignore', '-i', nargs='+', help="do not download the listed directories")
parser.add_argument('--host', '-s', help="the host to connect to")
args = parser.parse_args()
host = args.host if args.host else 'ftpupload.net'

def testFtp(ftp):
    t = threading.currentThread()
    while getattr(t, "do_run", True):
        try:
            ftp.nlst()
        except ftplib.error_temp:
            ftp.login(user=x.uname, passwd=x.password)
        time.sleep(15)

with ftplib.FTP(host) as ftp:
    try:
        ftp.login(user=x.uname, passwd=x.password)
    except Exception as e:
        print('\033[31;1mLOGIN FAILED: \033[0m' + str(e))
        sys.exit(1)
    if args.base:
        try:
            os.mkdir(args.base)
        except:
            pass
        ftp.cwd(args.base)
        if args.ignore:
            createfiles(ftp, args.base, args.ignore)
        else:
            createfiles(ftp, args.base)
    else:
        if args.ignore:
            createfiles(ftp, args.base, args.ignore)
        else:
            createfiles(ftp)
    event_handler = FTPFSHandler(ftp, args)
    observer = Observer()
    path_ = args.base if args.base else '.'
    observer.schedule(event_handler, path_, recursive=True)
    observer.start()
    try:
        tester = threading.Thread(target=testFtp, args=(ftp,))
        tester.start()
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
        tester.do_run = False
        print('\033[35;1mShutting down\033[0m: Please Wait up to 15 Seconds.')
    observer.join()
    tester.join()

После того, как я нажал кнопку «Войти» в окне, скрипт работает отлично, регистрирует вывод и делает все, что я хочу, даже закрывает окно, но значок запуска python просто сидит там, " Не отвечает ". Как я могу закрыть это окно, а затем продолжить выполнение моего кода без иконки Python Launcher, сидящей там и говорящей мне, что она "не отвечает" ????
Thx заранее!