Python2.7: Attribute Error in xml.sax.saxutils.XMLGenerator

Question

Hi there,
after switching from Ubuntu to Arch Linux I noticed a disturbing problem
in a Python script I wrote (see
http://sourceforge.net/projects/emcdutilityprog/files/).
Using Windows (Python 2.6) and Ubuntu 11.04 (Python 2.7) I did not
experience any problems.
Using Arch Linux (Python 2.7) I got the following errors:
Traceback (most recent call last):
  File "/usr/local/bin/emcd", line 1663, in settings_dialog
    self.settings.dialog(self.window)
  File "/usr/local/bin/emcd", line 1502, in dialog
    self.save()
  File "/usr/local/bin/emcd", line 1445, in save
    self.prepare_writing()
  File "/usr/local/bin/emcd", line 1414, in prepare_writing
self.xmltree.startElementNS((None,u'EELS-GUI-Settings'),u'EELS-GUI-Settings',attrs,True)
  File "/usr/local/bin/emcd", line 1352, in startElementNS
    self._write('\t'*self.counter)
AttributeError: Generator instance has no attribute '_write'
I'm using the '_write' method in an instance Generator, which has
xml.sax.saxutils.XMLGenerator as parent. I'm using it to make the
resulting xml file more readable for humans.
Have you encountered a similar problem? Maybe you could suggest me some
possible solutions to my little problem?
Thanks a lot
Andi

Answer 1

Poking deeper, I got a reproduceable segfault in my script, which appears to be limited to Arch Linux, too. Has anybody made a similar experience?
The problem appears to be in line 1172 of the script, where a method is connected to a GTK event. As far as I can tell, the problem is not in the callback method edit_meta as this method does not even get started.
Any ideas?