code: def unknown_command(self, args):
          '''handle mode switch by mode name as command'''
          mode_mapping = self.master.mode_mapping()
          mode = args[0].upper()
          if mode in mode_mapping:
              self.master.set_mode(mode_mapping[mode])
              return True
          return Falsf unknown_command(self, args):
          '''handle mode switch by mode name as command'''
          mode_mapping = self.master.mode_mapping()
          mode = args[0].upper()
          if mode in mode_mapping:
              self.master.set_mode(mode_mapping[mode])
              return True
          return False
docs: handle mode switch by mode name as command