code: def value(self):
          
          try:
              return self._value
          except AttributeError:
              self.value = self._field.default()
              return self._value
docs: A tuple of values. This attribute can be set with any iterable; the
          iterable is then evaluated into a tuple and stored at the bound field.
  
          Whenever values are written to this attribute, they are passed through
          the :meth:`~.AbstractCDataType.coerce` method of the
          :attr:`~.AbstractField.type_` of the field. To revert the
          :attr:`value` to its default, use the ``del`` operator.