code: def run_command(self, command, arg=None, is_eval=False):
          
          mode = is_eval and 'eval' or 'command'
  
          if isinstance(arg, tuple):
              name, d = arg
          else:
              name, d = arg, {}
  
          result = getattr(self.connection.admin, mode)(command, name, **d)
          return result
docs: run command on the server
  
          Args:
              command - command string
              arg - command argument
              is_eval - if True execute command as eval
  
          return command's result