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    <p>I think the problem is that the time-consuming loop is preventing the <code>tkinter</code> event loop, <a href="http://effbot.org/tkinterbook/widget.htm#Tkinter.Widget.mainloop-method" rel="nofollow noreferrer"><code>mainloop()</code></a>, from running. In other words, when your work intensive function runs in the same thread as the GUI, it interferes with it by hogging the interpreter. </p> <p>To prevent this you can use a secondary <a href="http://docs.python.org/2/library/threading.html?highlight=thread#threading.Thread" rel="nofollow noreferrer">Thread</a> to run your function and run the GUI and its progressbar in the main thread. To give you and idea of how to do this, here's a simple example I derived from code in a another (unrelated) <a href="https://stackoverflow.com/questions/6212896/python-ttk-progressbar">progressbar question</a> to show how easily something like that can be done. <em>Note:</em> It's generally recommended that secondary threads not be given direct access to the main thread's <code>tkinter</code> objects.</p> <pre><code>from Tkinter import * import ttk import time import threading def foo(): time.sleep(5) # simulate some work def start_foo_thread(event): global foo_thread foo_thread = threading.Thread(target=foo) foo_thread.daemon = True progressbar.start() foo_thread.start() root.after(20, check_foo_thread) def check_foo_thread(): if foo_thread.is_alive(): root.after(20, check_foo_thread) else: progressbar.stop() root = Tk() mainframe = ttk.Frame(root, padding="3 3 12 12") mainframe.grid(column=0, row=0, sticky=(N, W, E, S)) mainframe.columnconfigure(0, weight=1) mainframe.rowconfigure(0, weight=1) progressbar = ttk.Progressbar(mainframe, mode='indeterminate') progressbar.grid(column=1, row=100, sticky=W) ttk.Button(mainframe, text="Check", command=lambda:start_foo_thread(None)).grid(column=1, row=200, sticky=E) for child in mainframe.winfo_children(): child.grid_configure(padx=5, pady=5) root.bind('&lt;Return&gt;', start_foo_thread) root.mainloop() </code></pre>
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    1. COmartineau, upon your good answer, I posted another question, because I have difficulties implementing your solution into my programm. Maybe you also have an idea for this: http://stackoverflow.com/questions/16420041/python-how-to-get-progressbar-start-info-from-one-window-class-to-other
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    2. CO@solarisman: I'll take a look at the other question. I was wondering why you didn't also up-vote my answer here after accepting it.
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    3. COsorry, I am still pretty new here. I forgot to upvote, now I did.
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