Re: [Matplotlib-users] embedding in wx segfault

[John H. <jdh...@ac...>]

>>>>> "Flavio" == Flavio Codeco Coelho <fcc...@fi...> writes:

    Flavio> Hi I have a variant of the embedding_in_wx script that
    Flavio> worked fine on my previous version of matplotlib. Now,
    Flavio> with version 0.51 it's seg faulting. I updated the script
    Flavio> to reflect the changes in the library but still... Can
    Flavio> anyone see what may be going wrong?

Please resend as an attachment - your lines are wrapped and hence the
code is doubly difficult to debug.

A couple of suggestions: wx swallows exceptions.  This makes it
virtually impossible to debug scripts using wx since you cannot read
the stack trace.  The problem may be a simple syntax error in your
script having nothing to do with matplotlib or the wx backend per se,
and you wouldn't see it because of the exception swallowing problem.

Workarounds: 

  1) insert some print statements at the top of each function so you
     can see when the failure occurs.  This is essentially what Jeremy
     does in backend_wx.  Change the _DEBUG level to a low number in
     backend_wx to get more debugging information.  

  2) try running pychecker on your script.

A lifetime supply of free bugfixes to any wx guru who knows how to fix
this problem - Jeremy and I have certainly suffered with it long enough.

JDH