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former lets you give an instance a set of new instance vars. The latter lets you give it a new class. Both are typechecked and disallowed in restricted mode. For classes, the check for read-only special attributes is tightened so that only assignments to __dict__, __bases__, __name__, __getattr__, __setattr__, and __delattr__ (these could be made to work as well, but I don't know if that's useful -- let's see first whether mucking with instances will help).