Stack Overflow answer for #24589156

import subprocess

from Tkinter import Tk, Button
from Tkconstants import END
import tkFileDialog
import ScrolledText
from threading import Thread
from Queue import Queue

class RunThread(Thread):
    def __init__(self, filepath):
        super(RunThread, self).__init__()
        self.filepath = filepath
        self.output = Queue()
        self.finished = False

    def run(self):
        p = subprocess.Popen(['python', self.filepath],
                             stdout=subprocess.PIPE,
                             stderr=subprocess.STDOUT,
                             )
        for line in iter(p.stdout.readline, ''):
            self.output.put(line)
        self.finished = True

class Application(object):
    run_thread = None
    def run(self):
        self.root = Tk()
        self.code = ScrolledText.ScrolledText(self.root)
        self.code.pack()
        self.output = ScrolledText.ScrolledText(self.root)
        self.output.pack()
        self.run = Button(self.root, text="Run", command=self.run_script)
        self.run.pack()
        self.root.mainloop()

    def run_script(self):
        if self.run_thread:
            return
        script = self.code.get(1.0, END)
        filepath = tkFileDialog.asksaveasfilename()
        if filepath:
            if not filepath.endswith('.py'):
                filepath += '.py'
            with open(filepath, 'w') as f:
                f.write(script)
            self.run_thread = RunThread(filepath)
            self.run_thread.start()
            self.read_output()

    def read_output(self):
        while not self.run_thread.output.empty():
            line = self.run_thread.output.get()
            self.output.insert(END, line)
        if self.run_thread.finished:
            self.output.insert(END, "%s Finished" % self.run_thread.filepath)
            self.run_thread = None
        else:
            self.root.after(100, self.read_output)

Application().run()