[wxPython-users] Reload after an exception not possible ?

[Tal Einat]

On 8/1/07, Stef Mientki <s.mientki at ru.nl> wrote:
> hello,
>
> I posted this question in the normal Python newsgroup,
> because I think it's a normal Python question,
> but I'm afraid that these kinds of constructs are only used in GUI.
> So maybe here someone can give the answer.
> > hello,
> >
> > I've a graphical application (wxPython),
> > where the code in the main GUI loop is given below.
> >
> >
> > 1    JAL_Loaded = False
> > 2    while len(App_Running) > 0:
> > 3        if JALsPy_globals.State == SS_Run:
> > 4            try:
> > 5                if JAL_Loaded:
> > 6                    reload ( JAL_simulation_file )
> > 7                else:
> > 8                    JAL_Loaded = True
> > 9                    import JAL_simulation_file
> > 10           except JALsPy_globals.Reload_Exception:
> > 11               JALsPy_globals.State = SS_Halt
> >
> >
> > The first time the while loop is entered,
> > JAL_Loaded is False (line 1),
> > and when I press some button,
> > the code will enter at line 8,
> > importing a module, that has executable code with an infinite loop.
> >
> > To exit this infinite loop, an exception is generated (by a button
> > press),
> > and program comes back in the above while-loop line (10,11,2).
> >
> > So far so good.
> >
> > Then I change the code in the imported file,
> > and when I start the engine again,
> > the flag JAL_Loaded is True, so I don't import,
> > but I reload the file.
> >
> > Now I get the next exception
> >    UnboundLocalError: local variable 'JAL_simulation_file' referenced
> > before assignment
> >
> > So obviously I can't reload but have to do an import again
> > (which makes the code much simpler
> > but I don't understand why the reload raises an exception ????
> >
> thanks,
> Stef Mientki

Have you tried declaring JAL_simulation_file as global? I wonder if
that would work...

- Tal