Terry J. Reedy added the comment:

The same issue arises when an exception is raised during the __init__ 
execution, rather than in the call argument match phase, and the exception is 
caught.

class C():
    def __init__(self): self.a = self.b
    def __del__(self): self.a

try:
    C()
except AttributeError): pass
# print same message as before about self.a in __del__

What is different is that if the exception raised within __init__ is not 
caught, only the normal traceback is printed.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12085>
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