[issue12503] "with" statement error message is more confusing in Py2.7

[Éric Araujo]

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

Could AttributeError be improved to say something like this:

AttributeError: type 'type' has no attribute '__enter__'

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nosy: +eric.araujo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12503>
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