Range gets the keys in the range from the key-value store.

        :param key: key is the first key for the range. If range_end is not given,
            the request only looks up key.
        :type key: bytes

        :param range_end: range_end is the upper bound on the requested range
            [key, range_end). If range_end is ``\\0``, the range is all keys ``\u003e=`` key.
            If the range_end is one bit larger than the given key, then the range requests
            get the all keys with the prefix (the given key). If both key and range_end
            are ``\\0``, then range requests returns all keys.
        :type range_end: bytes

        :param prefix: If set, and no range_end is given, compute range_end from key prefix.
        :type prefix: bool

        :param count_only: count_only when set returns only the count of the keys in the range.
        :type count_only: bool

        :param keys_only: keys_only when set returns only the keys and not the values.
        :type keys_only: bool

        :param limit: limit is a limit on the number of keys returned for the request.
        :type limit: int

        :param max_create_revision: max_create_revision is the upper bound for returned
            key create revisions; all keys with greater create revisions will be filtered away.
        :type max_create_revision: int

        :param max_mod_revision: max_mod_revision is the upper bound for returned key
            mod revisions; all keys with greater mod revisions will be filtered away.
        :type max_mod_revision: int

        :param min_create_revision: min_create_revision is the lower bound for returned
            key create revisions; all keys with lesser create trevisions will be filtered away.
        :type min_create_revision: int

        :param min_mod_revision: min_mod_revision is the lower bound for returned key
            mod revisions; all keys with lesser mod revisions will be filtered away.
        :type min_min_revision: int

        :param revision: revision is the point-in-time of the key-value store to use for the
            range. If revision is less or equal to zero, the range is over the newest
            key-value store. If the revision has been compacted, ErrCompacted is returned as
            a response.
        :type revision: int

        :param serializable: serializable sets the range request to use serializable
            member-local reads. Range requests are linearizable by default; linearizable
            requests have higher latency and lower throughput than serializable requests
            but reflect the current consensus of the cluster. For better performance, in
            exchange for possible stale reads, a serializable range request is served
            locally without needing to reach consensus with other nodes in the cluster.
        :type serializable: bool

        :param sort_order: Sort order for returned KVs,
            one of :class:`txaioetcd.OpGet.SORT_ORDERS`.
        :type sort_order: str

        :param sort_target: Sort target for sorting returned KVs,
            one of :class:`txaioetcd.OpGet.SORT_TARGETS`.
        :type sort_taget: str or None

        :param timeout: Request timeout in seconds.
        :type timeout: int or None

def get(self,
            key,
            range_end=None,
            count_only=None,
            keys_only=None,
            limit=None,
            max_create_revision=None,
            min_create_revision=None,
            min_mod_revision=None,
            revision=None,
            serializable=None,
            sort_order=None,
            sort_target=None,
            timeout=None):
        """
        Range gets the keys in the range from the key-value store.

        :param key: key is the first key for the range. If range_end is not given,
            the request only looks up key.
        :type key: bytes

        :param range_end: range_end is the upper bound on the requested range
            [key, range_end). If range_end is ``\\0``, the range is all keys ``\u003e=`` key.
            If the range_end is one bit larger than the given key, then the range requests
            get the all keys with the prefix (the given key). If both key and range_end
            are ``\\0``, then range requests returns all keys.
        :type range_end: bytes

        :param prefix: If set, and no range_end is given, compute range_end from key prefix.
        :type prefix: bool

        :param count_only: count_only when set returns only the count of the keys in the range.
        :type count_only: bool

        :param keys_only: keys_only when set returns only the keys and not the values.
        :type keys_only: bool

        :param limit: limit is a limit on the number of keys returned for the request.
        :type limit: int

        :param max_create_revision: max_create_revision is the upper bound for returned
            key create revisions; all keys with greater create revisions will be filtered away.
        :type max_create_revision: int

        :param max_mod_revision: max_mod_revision is the upper bound for returned key
            mod revisions; all keys with greater mod revisions will be filtered away.
        :type max_mod_revision: int

        :param min_create_revision: min_create_revision is the lower bound for returned
            key create revisions; all keys with lesser create trevisions will be filtered away.
        :type min_create_revision: int

        :param min_mod_revision: min_mod_revision is the lower bound for returned key
            mod revisions; all keys with lesser mod revisions will be filtered away.
        :type min_min_revision: int

        :param revision: revision is the point-in-time of the key-value store to use for the
            range. If revision is less or equal to zero, the range is over the newest
            key-value store. If the revision has been compacted, ErrCompacted is returned as
            a response.
        :type revision: int

        :param serializable: serializable sets the range request to use serializable
            member-local reads. Range requests are linearizable by default; linearizable
            requests have higher latency and lower throughput than serializable requests
            but reflect the current consensus of the cluster. For better performance, in
            exchange for possible stale reads, a serializable range request is served
            locally without needing to reach consensus with other nodes in the cluster.
        :type serializable: bool

        :param sort_order: Sort order for returned KVs,
            one of :class:`txaioetcd.OpGet.SORT_ORDERS`.
        :type sort_order: str

        :param sort_target: Sort target for sorting returned KVs,
            one of :class:`txaioetcd.OpGet.SORT_TARGETS`.
        :type sort_taget: str or None

        :param timeout: Request timeout in seconds.
        :type timeout: int or None
        """

        def run(pg_txn):
            pg_txn.execute("SELECT pgetcd.get(%s,%s)", (Binary(key), 10))
            rows = pg_txn.fetchall()
            res = "{0}".format(rows[0][0])
            return res

        return self._pool.runInteraction(run)