[NT, wxPython 2.1.15]
I'm guessing this is a SWIG bug (?), but in the 2.1.15 release of wxPython
comparing at least one wxwindows object to None results in a seg fault.
Here's some sample code to demonstrate, taken from the wxTreeCtrl demo:
def OnRightClick(self, event):
pt = event.GetPosition();
#item = self.tree.HitTest(pt)
#self.log.WriteText("OnRightClick: %s\n" %
self.tree.GetItemText(item))
#self.tree.SelectItem(item)
itm = self.tree.GetSelection()
print 'here we go'
if itm == None:
print 'okey dokey'
(I had to comment out some stuff because it no longer works with the new
wxPython... sorry, but I haven't tracked this down yet)
that code will cause a seg fault (on NT at least). replacing the '=='
with 'is' on the second to last line causes everything to run just fine.
I have a coworker who can't seem to remember to use 'is' when testing
for None, so I'm guessing I'll find more instances of this problem.
Boy was that one a pain in the neck to track down.
-greg
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Greg Landrum, Ph.D. glandrum@combichem.com
Sr. Research Scientist Dupont Pharmaceutical Research Lab
Tel: (650)842-0560 x115 Fax: (650)842-0575