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For the Python 3 case, the documentation is vague and probably wrong, depending on what you understand "the current scope" to mean. I think it should read something like
. . . raise re-raises the current exception that is being handled. If no exception is being handled, a RuntimeError exception is raised indicating that this is an error.
I’m not sure but I suspect Python 2 is different because does not save the original exception when it handles a nested exception. In other words, at the point where the nested "bar" exception is raised inside the "foo" handler, Python forgets that "foo" was being handled.