Since the doctype() method doesn’t appear to be removed from the “default” (3.5?) branch either, here is a patch that avoids the deprecation warning when inheriting method + a test.

Hopefully this will be useful when you get some time to look at it. I’m not sure if the PyCFunction_ calls are a good idea; they don’t seem to be documented, but I couldn’t think of a better way to check if the method was overridden.