Filtering HTML with python

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from urllib.parse import urljoin

def absolute_hrefs(html, baseurl):
    t = html5lib.parseFragment(html, treebuilder = "etree", namespaceHTMLElements = False)
    for a in t.findall(".//*[@href]"):
        linkclass = a.attrib.get("class", "")
        href = urljoin(baseurl, a.attrib.get("href"))
        a.attrib['href'] = href
    html = ET.tostring(t, method="html", encoding="unicode")
    return html