[issue12022] AttributeError should report the same details when raised by lookup_special() as when raised in the REPL

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

> hasattr(transaction, '__exit__')

http://docs.python.org/dev/reference/datamodel#special-method-names explains that magic methods are looked up on the class, not on the instances.  There’s a lot of code out there that erroneously checks for __len__ or __call__ on instances, and this is the second time to my knowledge that a project abused a module-level __enter__ function.

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nosy: +eric.araujo

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<http://bugs.python.org/issue12022>
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