code: def _map_arg(arg):
      
      # Grab the easy to parse values
      if isinstance(arg, _ast.Str):
          return repr(arg.s)
      elif isinstance(arg, _ast.Num):
          return arg.n
      elif isinstance(arg, _ast.Name):
          name = arg.id
          if name == 'True':
              return True
          elif name == 'False':
              return False
          elif name == 'None':
              return None
          return name
      else:
          # Everything else we don't bother with
          return Unparseable()
docs: Return `arg` appropriately parsed or mapped to a usable value.