<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def close(self):
 """Closes the tunnel."""


        try:
            self.sock.shutdown(socket.SHUT_RDWR)
            self.sock.close()
        except socket.error:
            pass