How to use the pathos.secure.tunnel.TunnelException function in pathos

while True:
            localport = pick()
            if localport < 0:
                raise TunnelException('No available local port')
            #print('Trying port %d...' % localport)
            
            try:
                self._connect(localport, host, port, through=through)
                #print('SSH tunnel %d:%s:%d' % (localport, host, port))
            except TunnelException as e: # breaks 2.5 compatibility
                if e.args[0] == 'bind':
                    self.disconnect()
                    continue
                else:
                    self.__disconnect()
                    raise TunnelException('Connection failed')
                
            self.connected = True
            return localport

else: rhost = remotehost
        self._launcher(host=rhost, command=command,
                       options=options, background=True) #XXX: MMM
                      #options=options, background=False)
        self._launcher.launch()
        self._lport = localport
        self._rport = remoteport
        self._host = rhost
        self._pid = self._launcher.pid() #FIXME: should be tunnel_pid [pid()+1]
        line = self._launcher.response()
        if line:
            if line.startswith('bind'):
                raise TunnelException('bind')
            else:
                print(line)
                raise TunnelException('failure')
        return

host     -- remote hostname  [user@host:path is also valid]
    port     -- remote port number

Additional Input:
    through  -- 'tunnel-through' hostname  [default = None]
        '''
        from pathos.portpicker import portnumber
        if port is None:
            from pathos.core import randomport
            port = randomport(through) if through else randomport(host)

        pick = portnumber(self.MINPORT, self.MAXPORT)
        while True:
            localport = pick()
            if localport < 0:
                raise TunnelException('No available local port')
            #print('Trying port %d...' % localport)
            
            try:
                self._connect(localport, host, port, through=through)
                #print('SSH tunnel %d:%s:%d' % (localport, host, port))
            except TunnelException as e: # breaks 2.5 compatibility
                if e.args[0] == 'bind':
                    self.disconnect()
                    continue
                else:
                    self.__disconnect()
                    raise TunnelException('Connection failed')
                
            self.connected = True
            return localport

options = '-q -N -L %d:%s:%d' % (localport, remotehost, remoteport)
        command = ''
        if through: rhost = through
        else: rhost = remotehost
        self._launcher(host=rhost, command=command,
                       options=options, background=True) #XXX: MMM
                      #options=options, background=False)
        self._launcher.launch()
        self._lport = localport
        self._rport = remoteport
        self._host = rhost
        self._pid = self._launcher.pid() #FIXME: should be tunnel_pid [pid()+1]
        line = self._launcher.response()
        if line:
            if line.startswith('bind'):
                raise TunnelException('bind')
            else:
                print(line)
                raise TunnelException('failure')
        return