The ledger details endpoint provides information on a single ledger.

        `GET /ledgers/{sequence}
        <https://www.stellar.org/developers/horizon/reference/endpoints/ledgers-single.html>`_

        :param int ledger_id: The id of the ledger to look up.
        :return: The details of a single ledger.
        :rtype: dict

def ledger(self, ledger_id):
        """The ledger details endpoint provides information on a single ledger.

        `GET /ledgers/{sequence}
        <https://www.stellar.org/developers/horizon/reference/endpoints/ledgers-single.html>`_

        :param int ledger_id: The id of the ledger to look up.
        :return: The details of a single ledger.
        :rtype: dict

        """
        endpoint = '/ledgers/{ledger_id}'.format(ledger_id=ledger_id)
        return self.query(endpoint)