code: def convert(self):
          
  
          if self.is_type():
              return self.force_convert()
  
          raise TypeConversionError(
              "failed to convert from {} to {}".format(type(self._data).__name__, self.typename)
          )
docs: :return: Converted value.
          :raises typepy.TypeConversionError:
              If the value cannot convert.