R. David Murray added the comment: "Intentional" is not perhaps the exactly right term, but it is working as expected. There was a thread about this on python-dev ("PEP 3115 compliant dynamic type creation" and "adding types.build_class for 3.3"), that ultimately resulted in the addition of the 'new_class' function to the types module. The documentation should probably just say that types doesn't handle metaclass __prepare__, and provide a link to the new_class function. ---------- assignee: -> docs@python components: +Documentation -Interpreter Core nosy: +docs@python, ncoghlan, r.david.murray versions: +Python 3.4 _______________________________________ Python tracker http://bugs.python.org/issue18334 _______________________________________