import abc
from zope.interface import Interface, classImplements


class AFoo(metaclass=abc.ABCMeta):
    pass


class IFoo(Interface):
    pass


classImplements(AFoo, IFoo)


class Foo(AFoo):
    pass


class Bar:
    pass


AFoo.register(Bar)

print('Foo extends AFoo', issubclass(Foo, AFoo))
print('Foo implements IFoo', IFoo.implementedBy(Foo))
print('Bar extends AFoo', issubclass(Bar, AFoo))
print('Bar implements IFoo', IFoo.implementedBy(Bar))