帮忙看下html转化为xml有什么问题呢？

def flawcoverRead(self):
        
        file = open(self.inputdir)
        rst = file.read() 
        """</b> (buffer) <i> -->  </b> <type> (buffer) </type> <i>"""
        """</i> -->  </i></li>"""
        xmlstr = '<ul>' + rst.split('<ul>')[1].split('</ul>')[0] + '</ul>'
        xmlstr = xmlstr.replace("</b>", "</b><type>").replace("<i>", "</type><i>").replac("</i>", "</i></li>")
        root = etree.fromstring(xmlstr)
        xmlrst = []
        for c in root:
            els = []
            file, line = c.text.split(':')[:-1]
            els.append(file)
            els.append(line)
            
            level, ty, msg = [i.text.strip() for i in c]
            level = level[1]
            ty = ty[1:-1]
            temp = msg.split(":")
            func = temp[0]
            msg = ''.join(temp[1:]).strip().replace("\n", '')
            
            els.append(level)
            els.append(ty)
            els.append(func)
            els.append(msg)
            xmlrst.append(els)
                    
        return xmlrst

inputdir是html的输入路径，我在调用的时候有如下错误
line 23, in flawcoverRead root = etree.fromstring(xmlstr)
File "C:\Python27\lib\xml\etree\ElementTree.py", line 1301, in XML parser.feed(text)
File "C:\Python27\lib\xml\etree\ElementTree.py", line 1643, in feed self._raiseerror(v) File "C:\Python27\lib\xml\etree\ElementTree.py", line 1507, in _raiseerror raise err xml.etree.ElementTree.ParseError: mismatched tag: line 71, column 2

[解决办法]
按解释器提示的信息除错，看看xmlstr的内容吧...