def _render_str(self, string):
        """Returned a texified version of the string"""
        if isinstance(string, StrLabel):
            string = string._render(string.expr)
        string = str(string)
        if len(string) == 0:
            return ''
        name, supers, subs = split_super_sub(string)
        return render_latex_sub_super(
            name, subs, supers, translate_symbols=True)
Returned a texified version of the string