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Hello Raymond, thanks for your reply. In fact, I'm also not
sure if it counts as a bug. I also suggested a patch (handle
__getattr__ requests for __bases__ with an AttributeError)
for for the SF project which causes/d the problem.

I think, if there's a better way to decide on "class-ness"
than now, the code in inspect should be changed.
Fortunately, it doesn't have to be backward-compatible,
because the module is always distributed with a certain
interpreter version.