def c_fn(self, ruleset, sdict, rule, fontstyle):
        """ Generate the CSS font family
            A generic font can be found in two ways. In a <style:font-face>
            element or as a font-family-generic attribute in text-properties.
        """
        generic = ruleset.get((STYLENS,'font-family-generic') )
        if generic is not None:
            self.save_font(fontstyle, fontstyle, generic)
        family, htmlgeneric = self.fontdict.get(fontstyle, (fontstyle, 'serif'))
        sdict['font-family'] = (family, htmlgeneric)  % '%s, %s'
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/tablib-0.10.0/tablib/packages/odf3/odf2xhtml.py/StyleToCSS.c_fn/swapped operands of `%`