On Thu, 21 Jun 2012 16:19:41 +0100, Rotwang <sg...@hotmail.co.uk>
wrote:
>Hi all, I'm using Python 2.7.2 on Windows 7 and a module I've written is
>acting strangely. I can reproduce the behaviour in question with the
>following:
>
>--- begin bugtest.py ---
>
>import threading, Tkinter, os, pickle
>
>class savethread(threading.Thread):
> def __init__(self, value):
> threading.Thread.__init__(self)
> self.value = value
> def run(self):
> print 'Saving:',
> with open(os.path.join(os.getcwd(), 'bugfile'), 'wb') as f:
> pickle.dump(self.value, f)
> print 'saved'
>
>class myclass(object):
> def gui(self):
> root = Tkinter.Tk()
> root.grid()
> def save(event):
> savethread(self).start()
> root.bind('s', save)
> root.wait_window()
>
>m = myclass()
>m.gui()
>
>--- end bugtest.py ---
>
>
>Here's the problem: suppose I fire up Python and type
>
> >>> import bugtest
>
>and then click on the Tk window that spawns and press 's'. Then
>'Saving:' gets printed, and an empty file named 'bugfile' appears in my
>current working directory. But nothing else happens until I close the Tk
>window; as soon as I do so the file is written to and 'saved' gets
>printed. If I subsequently type
>
> >>> bugtest.m.gui()
>
>and then click on the resulting window and press 's', then 'Saving:
>saved' gets printed and the file is written to immediately, exactly as I
>would expect. Similarly if I remove the call to m.gui from the module
>and just call it myself after importing then it all works fine. But it
>seems as if calling the gui within the module itself somehow stops
>savethread(self).run from finishing its job while the gui is still alive.
>
>Can anyone help?
Try appending the dump command with f.flush() and os.fsync().
~Temia
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