code: def do_exit(self, arg):
          ''' Exit the shell. '''
          if self.arm.is_connected():
              self.arm.disconnect()
          print('Bye!')
          return Truf do_exit(self, arg):
          ''' Exit the shell. '''
          if self.arm.is_connected():
              self.arm.disconnect()
          print('Bye!')
          return True
docs: Exit the shell.