code: def get_pos_kw(self, token):
          
          # Low byte indicates number of positional paramters,
          # high byte number of keyword parameters
          args_pos = token.attr & 0xff
          args_kw = (token.attr >> 8) & 0xff
          return args_pos, args_kw
docs: Return then the number of positional parameters and
          represented by the attr field of token