def _get_underlying_value(self, key):
    # Note that the key may exist with a value of None, so we can't just
    # test self._value_map.get() for None.
    if self._value_map not in key:
      raise AttributeError(key)
    val = self._value_map[key]
    if isinstance(val, RankedValue):
      return val.value
    else:
      return val
dataset/ETHPy150Open pantsbuild/pants/src/python/pants/option/option_value_container.py/OptionValueContainer._get_underlying_value/swapped operands of `not in`