[IPython-dev] good news bad news

Brian Granger ellisonbg at gmail.com
Fri Aug 27 16:35:34 EDT 2010

On Fri, Aug 27, 2010 at 10:21 AM, Robert Kern <robert.kern at gmail.com> wrote:
> On 8/27/10 12:46 AM, Brian Granger wrote:
>> I have been playing more with the Qt Frontend that has GUi support.
>> So far all of the testing I have done recently is with the Qt
>> eventloop enabled in the kernel.
>> Good news:
>> * also all of the matplotlib examples that I have tried are working.
>> I would say we are over 90% working with mpl examples.
>> * I have started to try out tvtk/mayavi examples and most of them fail
>> miserably, either freezing or crashing the kernel entirely.
>> I think an in between thing to try is trait based apps.  Evan, do you
>> have some good examples of trait apps we can try in the kernel?
> from enthought.traits.api import HasTraits, Float
> class Foo(HasTraits):
>     x = Float()
> f = Foo()
> f.edit_traits()

I will give this a shot.

>> Like
>> we had to modify matplotlib, I expect we will have to patch traits and
>> Mayavi as well.
> Possibly. Both Traits and Pyface (and thus Envisage Workbench apps like Mayavi)
> do try to check if there is a QApplication already existing before creating one,
> but we may not be doing exactly the right things. Search for QApplication in
> enthought.traits.ui.qt4.toolkit and enthought.pyface.ui.qt4.init to see what we do.

I looked at this code already and it looks like it is handling the
QApplication creation OK, but I need to look a bit more at how it is
starting the event loop.

> Are you sure that you have ETS_TOOLKIT=qt4 set?

Nope, that would probably make a huge difference!  Thanks!


> --
> Robert Kern
> "I have come to believe that the whole world is an enigma, a harmless enigma
>  that is made terrible by our own mad attempt to interpret it as though it had
>  an underlying truth."
>   -- Umberto Eco
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Brian E. Granger, Ph.D.
Assistant Professor of Physics
Cal Poly State University, San Luis Obispo
bgranger at calpoly.edu
ellisonbg at gmail.com

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