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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 next_task(self, item, raise_exceptions=None, **kwargs):
 """Deserializes all transactions for this batch and archives the file. """

        filename = os.path.basename(item)
        batch = self.get_batch(filename)
        tx_deserializer = self.tx_deserializer_cls(
            allow_self=self.allow_self, override_role=self.override_role
        )
        try:
            tx_deserializer.deserialize_transactions(
                transactions=batch.saved_transactions
            )
        except (DeserializationError, TransactionDeserializerError) as e:
            raise TransactionsFileQueueError(e) from e
        else:
            batch.close()
            self.archive(filename)