Returns dict of data content.

        Keys
        ----

        shape: 3-tuple of Integer
        \tGrid shape
        grid: Dict of 3-tuples to strings
        \tCell content
        attributes: List of 3-tuples
        \tCell attributes
        row_heights: Dict of 2-tuples to float
        \t(row, tab): row_height
        col_widths: Dict of 2-tuples to float
        \t(col, tab): col_width
        macros: String
        \tMacros from macro list

def _get_data(self):
        """Returns dict of data content.

        Keys
        ----

        shape: 3-tuple of Integer
        \tGrid shape
        grid: Dict of 3-tuples to strings
        \tCell content
        attributes: List of 3-tuples
        \tCell attributes
        row_heights: Dict of 2-tuples to float
        \t(row, tab): row_height
        col_widths: Dict of 2-tuples to float
        \t(col, tab): col_width
        macros: String
        \tMacros from macro list

        """

        data = {}

        data["shape"] = self.shape
        data["grid"] = {}.update(self.dict_grid)
        data["attributes"] = [ca for ca in self.cell_attributes]
        data["row_heights"] = self.row_heights
        data["col_widths"] = self.col_widths
        data["macros"] = self.macros

        return data