How to use the premailer.merge_style.merge_styles function in premailer

)

                for item in items:
                    item_id = id(item)
                    if item_id not in elements:
                        elements[item_id] = {"item": item, "classes": [], "style": []}

                    elements[item_id]["style"].append(processed_style)
                    elements[item_id]["classes"].append(class_)

        # Now apply inline style
        # merge style only once for each element
        # crucial when you have a lot of pseudo/classes
        # and a long list of elements
        for _, element in elements.items():
            final_style = merge_styles(
                element["item"].attrib.get("style", ""),
                element["style"],
                element["classes"],
                remove_unset_properties=self.remove_unset_properties,
            )
            if final_style:
                # final style could be empty string because of
                # remove_unset_properties
                element["item"].attrib["style"] = final_style
            self._style_to_basic_html_attributes(
                element["item"], final_style, force=True
            )

        if self.remove_classes:
            # now we can delete all 'class' attributes
            for item in page.xpath("//@class"):

if item_id not in elements:
                        elements[item_id] = {
                            'item': item,
                            'classes': [],
                            'style': [],
                        }

                    elements[item_id]['style'].append(processed_style)
                    elements[item_id]['classes'].append(class_)

        # Now apply inline style
        # merge style only once for each element
        # crucial when you have a lot of pseudo/classes
        # and a long list of elements
        for _, element in elements.items():
            final_style = merge_styles(
                element['item'].attrib.get('style', ''),
                element['style'],
                element['classes'],
                remove_unset_properties=self.remove_unset_properties,
            )
            if final_style:
                # final style could be empty string because of
                # remove_unset_properties
                element['item'].attrib['style'] = final_style
            self._style_to_basic_html_attributes(
                element['item'],
                final_style,
                force=True
            )

        if self.remove_classes: