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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 start_tunnel(self, local_port, remote_address, remote_port):
 """ Start ssh forward tunnel :type local_port: int :param local_port: local port binding for ssh tunnel :type remote_address: str :param remote_address: remote tunnel endpoint bind address :type remote_port: int :param remote_port: remote tunnel endpoint bind port """

        self.tunnel.start(local_port, remote_address, remote_port)
        self.tunnel_port = local_port