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From: Vincent Vande Vyvre <vincent.vande.vyvre@telenet.be>
Newsgroups: comp.lang.python
Subject: AttributeError into a bloc try-except AttributeError
Date: Sun, 12 Jun 2016 09:20:44 +0200
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Hi,

I have a strange behaviour in my code.

In an interactive session, the result is as expected:

Python 3.4.3 (default, Oct 14 2015, 20:28:29)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
 >>> a = None
 >>> try:
...     _ = a.value
... except AttributeError:
...     print('OK')
...
OK
 >>>

But not in my code:

     def call_settings_dialog(self):
         try:
             _ = self.video.category
             self.core.artelive.configure_downloading(self.video)
         except AttributeError:
             self.core.artetv.configure_downloading(self.video)

and ...

Traceback (most recent call last):
   File "/home/vincent/qarte-3/trunk/loadingscheduler.py", line 240, in 
call_settings_dialog
     _  = self.video.category
AttributeError: 'TVItem' object has no attribute 'category'

I have two types of video, one with an attribute category handled by a 
module 'artelive' and an other without this attribute handled by an 
other module, that's the reason of this code.