[Tkinter] Defining a self made module's function to interact with the main .py variables?

[Gilush]

Man I must thank you!
you made me break my head with that listener thread and now I got it working!! (still shocked about it lol)
I gave up on trying to read the std and just merged the files into one and did some re-design.
now I got 3 threads running with 1 communicating with the widget.

here it is:

    def thread_handler(self, host):

        wt = threading.Thread(target=self.write_to_file, args=(host,))
        pt = threading.Thread(target=self.print_to_box, args=(host,))
        dt = threading.Thread(target=self.delete_default_lines, args=())

        wt.start()
        pt.start()
        dt.start()

also, I started the entire GUI with a thread and kept it alive:

if __name__ == "__main__":

    lock = threading.Lock()
    lock.acquire()
    t = threading.Thread(name="Main GUI", target=main, args=())
    t.start()

and this is the widget update:

    def print_to_box(self, host):
        print(f'Current Proccess: {mp.current_process().name} + {mp.current_process().pid}\n')
        with sub.Popen(["ping", "-n", '4', f'{host}'], stdout=sub.PIPE,
                       bufsize=1, universal_newlines=True, stderr=sub.STDOUT) as p:
            for line in p.stdout:
                self.text_window.insert(tk.END, line)

that did the entire trick.
Thanks again!