Disconnects from the Redis server

def disconnect(self):
        "Disconnects from the Redis server"
        self._parser.on_disconnect()
        if self._sock is None:
            return
        if self._selector is not None:
            self._selector.close()
            self._selector = None
        try:
            if os.getpid() == self.pid:
                self._sock.shutdown(socket.SHUT_RDWR)
            self._sock.close()
        except socket.error:
            pass
        self._sock = None