Returns unicode string of result for given key (one cell)

        Parameters
        ----------

        key: 3-Tuple of Integer
        \t Cell key

def _get_result_string(self, key):
        """Returns unicode string of result for given key (one cell)

        Parameters
        ----------

        key: 3-Tuple of Integer
        \t Cell key

        """

        row, col, tab = key

        result_obj = self.grid.code_array[row, col, tab]

        try:
            # Numpy object arrays are converted because of numpy repr bug
            result_obj = result_obj.tolist()

        except AttributeError:
            pass

        return unicode(result_obj)