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    <p>Below is a working version of your code. There were a number of issues I had to fix because you didn't change a number of things in the code from my answer to your other <a href="https://stackoverflow.com/questions/16400533/python-ttk-progress-bar-appears-after-process-why">question</a> about progressbars.</p> <p>The answer to your main question here is basically that you have to pass the instance around and remember it when necessary in the various class instances involved so that their methods will have it available through the<code>self</code> argument when they need it. Also, the way you were trying to derive and override the <a href="http://www.pythonware.com/library/tkinter/introduction/dialog-windows.htm" rel="nofollow noreferrer"><code>tkSimpleDialog.Dialog</code></a> base class methods was both over-complicated and incorrect as well. </p> <p>Usually the best (and simplest) thing to do is just supply your own <code>validate()</code> and <code>apply()</code> methods since that's how it was designed to work. If you also need your own <code>__init__()</code> constructor, it's important to only pass parameters to the base class's method that it understands from within the one in the subclass. If you need more functionality, it can usually be provided via additional derived-class-only methods, that only it or other classes you've also created know about.</p> <p>Anyway, here's what I ended-up with:</p> <pre><code>import Tkinter, ttk, tkFileDialog, tkSimpleDialog, time, threading class App: def __init__(self, master): self.progress_line(master) def progress_line(self, master): # the value of "maximum" determines how fast progressbar moves self._progressbar = ttk.Progressbar(master, mode='indeterminate', maximum=4) # speed of progressbar self._progressbar.place(anchor='ne', height="20", width="150", x="175", y="30") @property def progressbar(self): return self._progressbar # return value of private member class AppMenu(object): def __init__(self, master, progressbar): self.master = master self.menu_bar() self.progressbar = progressbar def menu_bar(self): self.menu_bar = Tkinter.Menu(self.master) self.master.config(menu=self.menu_bar) self.create_menu = Tkinter.Menu(self.menu_bar, tearoff=False) self.create_menu.add_command(label="do", command=self.do) self.menu_bar.add_cascade(label="now", menu=self.create_menu) def do(self): Dialog(self.master, self.progressbar) # display the dialog box class Dialog(tkSimpleDialog.Dialog): def __init__(self, parent, progressbar): self.progressbar = progressbar tkSimpleDialog.Dialog.__init__(self, parent, title="Do foo?") def apply(self): self.start_foo_thread() # added dialog methods... def start_foo_thread(self): self.foo_thread = threading.Thread(target=self.foo) self.foo_thread.daemon = True self.progressbar.start() self.foo_thread.start() master.after(20, self.check_foo_thread) def check_foo_thread(self): if self.foo_thread.is_alive(): master.after(20, self.check_foo_thread) else: self.progressbar.stop() def foo(self): # some time-consuming function... time.sleep(3) master = Tkinter.Tk() master.title("Foo runner") app = App(master) appmenu = AppMenu(master, app.progressbar) master.mainloop() </code></pre> <p>Hope this helps.</p>
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    1. POPython: How to get progressbar start() info from one window (class) to other
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    1. COfantastic, thanks a lot, it works. I now have to study your answer and the code you have given.
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    2. CO@solarisman: You're welcome, that's good to hear. I would also recommend reading (and following) PEP 8 [Style Guide for Python Code](http://www.python.org/dev/peps/pep-0008/) because it will make your code easier -- at least for others -- to read and modify ;-).
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    3. COthanks for this also. i was in fact going to ask here at Stackoverflow (which I discovered a couple of days ago and find absolutely fascinating for learning) about code style..how to best..since i basically just started with programming and Python and I am uncertain about whether I go into the right direction. So I will study PEP8 thoroughly. thanks!
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