Python delegate decorator

delegates.py

def delegates(method_names, to):
    def dm(method_name):
        def fwraps(self, *args, **kwargs):
            wrappedf = getattr(getattr(self, to), method_name)
            return wrappedf(*args, **kwargs)
        fwraps.__name__ = method_name
        return fwraps
    def cwraps(cls):
        for name in method_names:
            setattr(cls, name, dm(name))
        return cls
    return cwraps


# Usage
class A(object):
    def method_a(self, *args, **kwargs):
        pass
    
    def method_b(self, *args, **kwargs):
        pass

@delegates(['method_a', 'method_b'], to='a')
class B(object):
    def __init__(self):
        self.a = A()

b = B()
b.method_a(...)