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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _etree_py26_write(f, tree):
 """ Compatibility workaround for ElementTree shipped with py2.6 """

    f.write("<?xml version='1.0' encoding='utf-8'?>\n".encode('utf-8'))

    if etree.VERSION[:3] == '1.2':
        def fixtag(tag, namespaces):
            if tag == XML_NS + 'lang':
                return 'xml:lang', ""
            if '}' in tag:
                j = tag.index('}') + 1
                tag = tag[j:]
                xmlns = ''
            if tag == 'feed':
                xmlns = ('xmlns', str('http://www.w3.org/2005/Atom'))
                namespaces['http://www.w3.org/2005/Atom'] = 'xmlns'
            return tag, xmlns
    else:
        fixtag = etree.fixtag

    old_fixtag = etree.fixtag
    etree.fixtag = fixtag
    try:
        tree.write(f, encoding=str('utf-8'))
    finally:
        etree.fixtag = old_fixtag