code: def get_command_class(self, cmd):
          
          try:
              cmdpath = self.registry[cmd]
          except KeyError:
              raise CommandError("No such command %r" % cmd)
          if isinstance(cmdpath, basestring):
              Command = import_class(cmdpath)
          else:
              Command = cmdpath
          return Command
docs: Returns command class from the registry for a given ``cmd``.
  
          :param cmd: command to run (key at the registry)