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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 commit(self, unit_of_work):
 """ Dump all resources that were modified by the given session back into the repository. """

        MemoryRepository.commit(self, unit_of_work)
        if self.is_initialized:
            entity_classes_to_dump = set()
            for state in unit_of_work.iterator():
                entity_classes_to_dump.add(type(state.entity))
            for entity_cls in entity_classes_to_dump:
                self.__dump_entities(entity_cls)