def delete(self, conn, key):
        """Deletes a key/value pair from the server.

        :param key: is the key to delete.
        :return: True if case values was deleted or False to indicate
        that the item with this key was not found.
        """
        assert self._validate_key(key)

        command = b'delete ' + key + b'\r\n'
        response = yield from self._execute_simple_command(conn, command)

        if response not in (const.DELETED, const.NOT_FOUND):
            raise ClientException('Memcached delete failed', response)
        return response == const.DELETED
Deletes a key/value pair from the server.

        :param key: is the key to delete.
        :return: True if case values was deleted or False to indicate
        that the item with this key was not found.