traceback of the script http://stackoverflow.com/a/13731150/322468

matplotlib valid backends crash

supported backends: 	['pdf', 'wx', 'gtk3', 'gtk', 'ps', 'qtagg', 'tkagg', 'gtkcairo', 'mixed', 'template', 'gtk3cairo', 'svg', 'qt4agg', 'gtk3agg', 'emf', 'qt', 'cocoaagg', 'qt4', 'wxagg', 'agg', 'gtkagg', 'fltkagg', 'pgf', 'macosx', 'cairo', 'gdk']
/usr/lib/python2.7/dist-packages/gobject/constants.py:24: Warning: g_boxed_type_register_static: assertion `g_type_from_name (name) == 0' failed
  import gobject._gobject
/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:40: Warning: specified class size for type `PyGtkGenericCellRenderer' is smaller than the parent type's `GtkCellRenderer' class size
  from gtk import _gtk
/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:40: Warning: g_type_get_qdata: assertion `node != NULL' failed
  from gtk import _gtk
fish: Job 1, “python valid_matplotlib_backends.py ” terminated by signal SIGSEGV (Address boundary error)