<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def connect(self):
 """Create new connection unless we already have one."""

        if not getattr(self._local, 'conn', None):
            try:
                server = self._servers.get()
                logger.debug('Connecting to %s', server)
                self._local.conn = ClientTransport(server, self._framed_transport,
                    self._timeout, self._recycle)
            except (Thrift.TException, socket.timeout, socket.error):
                logger.warning('Connection to %s failed.', server)
                self._servers.mark_dead(server)
                return self.connect()
        return self._local.conn