decorators.py

def has_methods(*methods):
    def decorator(Base):
        def __subclasshook__(Class, Subclass):
            if Class is Base:
                attributes = collections.ChainMap(*(Superclass.__dict__ for Superclass in Subclass.__mro__))
                if all(method in attributes for method in methods):
                    return True
            return NotImplemented
        Base.__subclasshook__ = classmethod(__subclasshook__)
        return Base
    return decorator