code: def get_params(self, *keys):
          
  
          if len(keys) == 0:
              return vars(self)
          else:
              return [vars(self)[k] for k in keys]
docs: Returns the specified parameters for the current preprocessor.
  
          Parameters:
          -----------
          keys : variable sized list, containing the names of the requested parameters
  
          Returns:
          --------
          values : list or dictionary, if any `keys` are specified
          those named parameters' values are returned, otherwise
          all parameters are returned as a dictionary