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    <p>Since tkinter is <em>single threaded</em>, you need another thread to execute your <code>main</code> function without freezing the GUI. One common approach is that the working thread puts the messages into a synchronized object (like a <a href="http://docs.python.org/2/library/queue.html"><code>Queue</code></a>), and the GUI part consumes this messages, updating the progress bar.</p> <p>The following code is based on a full detailed <a href="http://code.activestate.com/recipes/82965/">example</a> on ActiveState:</p> <pre><code>import tkinter as tk from tkinter import ttk import threading import queue import time class App(tk.Tk): def __init__(self): tk.Tk.__init__(self) self.queue = queue.Queue() self.listbox = tk.Listbox(self, width=20, height=5) self.progressbar = ttk.Progressbar(self, orient='horizontal', length=300, mode='determinate') self.button = tk.Button(self, text="Start", command=self.spawnthread) self.listbox.pack(padx=10, pady=10) self.progressbar.pack(padx=10, pady=10) self.button.pack(padx=10, pady=10) def spawnthread(self): self.button.config(state="disabled") self.thread = ThreadedClient(self.queue) self.thread.start() self.periodiccall() def periodiccall(self): self.checkqueue() if self.thread.is_alive(): self.after(100, self.periodiccall) else: self.button.config(state="active") def checkqueue(self): while self.queue.qsize(): try: msg = self.queue.get(0) self.listbox.insert('end', msg) self.progressbar.step(25) except Queue.Empty: pass class ThreadedClient(threading.Thread): def __init__(self, queue): threading.Thread.__init__(self) self.queue = queue def run(self): for x in range(1, 5): time.sleep(2) msg = "Function %s finished..." % x self.queue.put(msg) if __name__ == "__main__": app = App() app.mainloop() </code></pre> <p>Since the <a href="http://code.activestate.com/recipes/82965/">original example</a> on ActiveState is a bit messy IMO (the <code>ThreadedClient</code> is quite coupled with the <code>GuiPart</code>, and things like controlling the moment to spawn the thread from the GUI are not as straightforward as they could be), I have refactored it and also added a Button to start the new thread.</p>
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    1. POHow to connect a progress bar to a function?
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    1. COaaaah I don't understand. could you explain it, maybe make a simpler example
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    2. CO@user2148781 I've added an example. The only difference is that this one has the progress bar widget, but the concept is the same.
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    3. COBut how could I start the workerThread from within the GuiPart instead of having it start automatically?
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