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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 set_connect_args(self, dsn=None, **connect_kwargs):
 r"""Set the new connection arguments for this pool. The new connection arguments will be used for all subsequent new connection attempts. Existing connections will remain until they expire. Use :meth:`Pool.expire_connections() <asyncpg.pool.Pool.expire_connections>` to expedite the connection expiry. :param str dsn: Connection arguments specified using as a single string in the following format: ``postgres://user:pass@host:port/database?option=value``. :param \*\*connect_kwargs: Keyword arguments for the :func:`~asyncpg.connection.connect` function. .. versionadded:: 0.16.0 """


        self._connect_args = [dsn]
        self._connect_kwargs = connect_kwargs
        self._working_addr = None
        self._working_config = None
        self._working_params = None