Micah Friesen <guinnessforbreakf...@gmail.com> added the comment:

I ran into this recently, as well, and have lost probably a day's worth of time 
debugging it. I submit that this is not a feature - I can't imagine a 
real-world scenario where you actually want to write debuggable code where a 
descriptor defers to __getattr__ (except perhaps for exception handling, in 
which case some re-factoring is in order), particularly because descriptors are 
effectively mix-ins and can be used on multiple classes.

I worked around this by writing an ancestor descriptor that catches 
AttributeErrors and re-raises them as a user-defined exception.

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nosy: +Micah.Friesen

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue1615>
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