code: def msetnx(self, *args, **kwargs):
          
          if args:
              if len(args) != 1 or not isinstance(args[0], dict):
                  raise RedisError('MSETNX requires **kwargs or a single dict arg')
              mapping = args[0]
          else:
              mapping = kwargs
  
          if len(mapping) == 0:
              raise ResponseError("wrong number of arguments for 'msetnx' command")
  
          for key in mapping.keys():
              if self._encode(key) in self.redis:
                  return False
          for key, value in mapping.items():
              self.set(key, value)
  
          return True
docs: Sets key/values based on a mapping if none of the keys are already set.
          Mapping can be supplied as a single dictionary argument or as kwargs.
          Returns a boolean indicating if the operation was successful.