How to use the creoleparser.core function in Creoleparser

def _build(self,mo,element_store, environ):
        try:
            abbr, title = mo.group(1).split(":", 1)
        except ValueError:
            abbr = mo.group(1)
            title = None
        return creoleparser.core.bldr.tag.__getattr__('abbr')(
                   creoleparser.core.fragmentize(abbr,
                       self.child_elements,
                       element_store, environ), title=title)

attrs = {}
    if isinstance(act, Activity):
        due = act.due_date
        if due:
            iso8601 = local_tz.localize(due).isoformat()
            text = act.due_date.strftime(dateformat)
            attrs['title'] = iso8601
        else:
            text = '["%s" has no due date specified]' % (act.name)
            attrs['class'] = 'empty'
    else:
        # error
        text = act
        attrs['class'] = 'empty'

    return creoleparser.core.bldr.tag.__getattr__('span')(text, **attrs)

from pages.models import Page
    if prefix:
        pages = Page.objects.filter(offering=offering, label__startswith=prefix)
    else:
        pages = Page.objects.filter(offering=offering)

    # ... except this page (if known)
    if pageversion:
        pages = pages.exclude(id=pageversion.page_id)

    elements = []
    for p in pages:
        link = creoleparser.core.bldr.tag.__getattr__('a')(p.current_version().title or p.label, href=p.label)
        li = creoleparser.core.bldr.tag.__getattr__('li')(link)
        elements.append(li)
    return creoleparser.core.bldr.tag.__getattr__('ul')(elements, **{'class': 'filelist'})

def _build(self,mo,element_store, environ):
        lang = mo.group(1)
        code = mo.group(2).rstrip()
        
        return creoleparser.core.bldr.tag.__getattr__(self.tag)(
            creoleparser.core.fragmentize(code, self.child_elements,
                        element_store, environ, remove_escapes=False),
            class_="brush: "+lang)