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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 are_items_sequential(self):
 """Tests if the items or parts in this assessment are taken sequentially. return: (boolean) - ``true`` if the items are taken sequentially, ``false`` if the items can be skipped and revisited *compliance: mandatory -- This method must be implemented.* """

        if self._my_map['itemsSequential'] is None:
            return self.get_assessment().are_items_sequential()
        return bool(self._my_map['itemsSequential'])