[Tkinter-discuss] update of elements in GUI

[Alex Ter-Sarkissov]

thanks, in one of these articles it says. 'Be careful - Tkinter in not
re-entrant'. MAybe this is the problem? So far I've tried

(1) Label(mainframe.update_idletasks(),textvariable=best,bg='#321000',fg='#000fff000',font=("Helvetica",x1)).grid(column=1,row=1)

and

(2)
mainframe = Frame(root)
mainframe.grid(column=1000, row=1000, sticky=(N, W, E, S))
mainframe.columnconfigure(0, weight=1)
mainframe.rowconfigure(0, weight=1)
mainframe.update()

Neither worked, of course, otherwise I woudln't be posting it)

I'm not using any classes

2010/8/18 Cameron Laird <Cameron at phaseit.net>

> On Wed, Aug 18, 2010 at 12:50:38AM +1200, Alex Ter-Sarkissov wrote:
>                        .
>                        .
>                        .
> > I have some elements on the screen (Labels, most importantly) which
> content
> > has to be updated every iteration of the algorithm run, e.g. "Iteration
> ="
> > [i] for i in range(n). I've tried using mainframe.update_idletasks()
> > and
> Label(mainframe.update_ideltasks(),textvariable=var).grid(column=1,row=1),
> > but without success so far. In MATLAB this command is drawnow.
>                         .
>                        .
>                        .
> I believe I understand your description.
>
> For a "quick fix", I recommend you experiment with update() (as
> opposed to update_idletasks()) applied to mainframe.
>
> For better long-term maintainability, though, you almost
> certainly should "return to the event loop" on each iteration
> of your run (there are also multi-threading approaches, but
> they're somewhat trickier to code correctly).
>
> You might find <URL: http://wiki.tcl.tk/1255 >, <URL:
> http://wiki.tcl.tk/1526 >, and <URL:
> http://osdir.com/ml/python.tkinter/2008-05/msg00014.html > of
> interest.
>
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