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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 __get_pricedb_session(self):
 """ Provides initialization and access to module-level session """

        from pricedb import dal

        if not self.pricedb_session:
            self.pricedb_session = dal.get_default_session()
        return self.pricedb_session