I would like to hire a Python Developer

I have a Python script with a GUI from Tkinter. I'm redirecting the output of a script from the terminal to the Tkinter text widget via threading. There's a button to start the script, and a button to stop the output. Problem: when I push the exit button(to stop the script) and again on the button to run the script, there's no output in the text widget. If I push a third time on the button to run the script, there's the same output as the first time and the fourth time there's no output and so on...