How to use the xlsxwriter.shape.Shape._get_font_style_attributes function in XlsxWriter

if 'horizontal' in shape.align:
                align = shape.align['horizontal']
                if align == 'center':
                    attributes.append(('anchorCtr', '1'))
            else:
                attributes.append(('anchorCtr', '0'))

        self._xml_start_tag('xdr:txBody')
        self._xml_empty_tag('a:bodyPr', attributes)
        self._xml_empty_tag('a:lstStyle')

        lines = shape.text.split('\n')

        # Set the font attributes.
        font = shape.font
        style_attrs = Shape._get_font_style_attributes(font)
        latin_attrs = Shape._get_font_latin_attributes(font)
        style_attrs.insert(0, ('lang', font['lang']))

        if shape.textlink != '':
            attributes = [
                ('id', '{B8ADDEFE-BF52-4FD4-8C5D-6B85EF6FF707}'),
                ('type', 'TxLink')]

            self._xml_start_tag('a:p')
            self._xml_start_tag('a:fld', attributes)

            self._write_font_run(font, style_attrs, latin_attrs, 'a:rPr')

            self._xml_data_element('a:t', shape.text)
            self._xml_end_tag('a:fld')

def _write_a_def_rpr(self, font):
        # Write the  element.
        has_color = 0

        style_attributes = Shape._get_font_style_attributes(font)
        latin_attributes = Shape._get_font_latin_attributes(font)

        if font and font.get('color') is not None:
            has_color = 1

        if latin_attributes or has_color:
            self._xml_start_tag('a:defRPr', style_attributes)

            if has_color:
                self._write_a_solid_fill({'color': font['color']})

            if latin_attributes:
                self._write_a_latin(latin_attributes)

            self._xml_end_tag('a:defRPr')
        else:

def _write_a_r_pr(self, font):
        # Write the  element.
        has_color = 0
        lang = 'en-US'

        style_attributes = Shape._get_font_style_attributes(font)
        latin_attributes = Shape._get_font_latin_attributes(font)

        if font and font['color'] is not None:
            has_color = 1

        # Add the lang type to the attributes.
        style_attributes.insert(0, ('lang', lang))

        if latin_attributes or has_color:
            self._xml_start_tag('a:rPr', style_attributes)

            if has_color:
                self._write_a_solid_fill({'color': font['color']})

            if latin_attributes:
                self._write_a_latin(latin_attributes)