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[Python-Dev] __getattribute__'s error is not available in __getattr__

Jason Maldonis jjmaldonis at gmail.com
Mon May 1 23:47:32 EDT 2017 
Hi everyone,

If this should be asked in learn python I apologize -- please just tell me
without answering.

I'm working on a large class architecture and I find myself often
overloading __getattr__.  I am continuously running into the issue where I
want __getattr__ to have access to the error that was raised in
__getattribute__, but it seems completely unavailable. Is that true?

One simple case that I'm guessing others have run into, is if __getattr__
fails, the error from __getattribute__ isn't in the stack trace that gets
printed to screen.  To fix this (on occasion) I'll even re-call
__getattribute__ within __getattr__ just to get the error so I can properly
"raise from" the __getattibute__'s error -- although that's probably bad
practice in general.

I'd like to be able to access the error that was raised in __getattribute__
when __getattr__ is called.

Two more quick context comments: python is awesome, thank you all for your
hard work; and I've been writing python almost every day for ~ 5 years now
and I can do all the "black magic" jazz, so I'll be okay with an
implementation that requires that type of stuff if necessary.

Thanks!
Jason
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