On Jul 5, 2007, at 2:13 PM, Michael Droettboom wrote: > > Interesting. I don't get that, but I do get some random segfaults (I > got lucky the first time I tested). It looks like wxPython doesn't retain a reference to the wxApp PyObj for you: kmcivor@400exp209:~/Projects/matplotlib-svn$ pythonw Python 2.4.4 (#1, Oct 18 2006, 10:34:39) [GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import wx >>> app = wx.PySimpleApp() >>> del app >>> wx.GetApp() Segmentation fault > I'm awfully surprised that wx.GetApp() would return an iterator, as > you > are getting, so maybe it's corruption of some sort? My guess is that Eric got lucky and ob_type was pointing to the listiterator's C type instance. > Since I didn't want to just put the wxapp global variable back in, > I assigned it to the figure that creates it, therefore stick around > as long as the figure does. (Is that the correct thing for its > lifetime?) I don't think this will work if you create two figures, destroy the first one, and then create another figure. Once created, the wxApp needs to exist for the life of the python process. I'll go ahead an put the global variable back in. > Also, I'm a little puzzled by this code in show() in backend_wx.py: > > wxapp = wx.GetApp() > if wxapp is not None: > # wxPython 2.4 has no wx.App.IsMainLoopRunning() method > imlr = getattr(wxapp, 'IsMainLoopRunning', lambda: False) > if imlr(): > wxapp.MainLoop() > > If I'm reading this correctly, shouldn't it be "if not imlr()"? Yes, it should be. I'll try to code with my eyes open from now on. :-/ Ken