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How to implement the composition pattern? I have a class Container which has an attribute object Contained . I would like to redirect/allow access to all methods of Contained class from Container by simply calling my_container.some_contained_method() . Am I doing the right thing in the right way? I use something like: class Container: def __init__(self): self.contained = Contained() def __getattr__(self, item): if item in self.__dict__: # some overridden return self.__dict__[item] else: return self.contained.__getattr__(item) # redirection Background: I am trying to build a class ( Indicator ) that adds to the functionality of an existing class ( pandas.DataFrame ). Indicator will have all the methods of DataFrame . I could use inheritance , but I am following the "favor composition over inheritance " advice (see, e.g., the answers in: python: inheriting or composition ). One reason not to inherit is because the base class is not serializable and I need to serialize. I have found this , but I am not sure if it fits my needs.

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