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I'm attaching a test that Eric Huss sent in private
mail.
The test fails, because old exception pickles don't
have args for the reconstructor, but their __init__()
gets called anyway because they are new style classes
now.
The problem is in cPickle.InstanceNew() and
pickle.Unpickler._instantiate(). Those methods behave
differently depending on the type of the object
instantiated; they avoid the __init__() call when type
is an old style class.
There is nothing that can be done in the exception
classes to fix this issue; the fix would need to be
in the pickle and cPickle module.
File Added: test_exception_pickle.py