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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def load(cls, path):
 """ Loads an instance of the class from a file. Parameters path : str Path to an HDF5 file. Examples -------- This is an abstract data type, but let us say that ``Foo`` inherits from ``Saveable``. To construct an object of this class from a file, we do: """

        if path is None:
            return cls.load_from_dict({})
        else:
            d = io.load(path)
            return cls.load_from_dict(d)