class Registry:
    def __init__(self):
        self.names = []
 
    def register(self, func):
        self.names.append(func.__name__)
        return func
 
    def apply(self, cls):
        for name in self.names:
            print(cls, name)
            print(getattr(cls, name))
 
def hiding_decorator(fn):
    def wrapper(*args, **kwargs):
        print("do some logging etc.")
        return fn(*args, **kwargs)
    return wrapper
 
registry = Registry()
@registry.apply
class ModelA(object):
    @hiding_decorator
    @registry.register
    def a_method(self):
        pass

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