BS4的解析次序

htm2 = requests.get(url,headers)
    soup = BeautifulSoup(htm2.content,'lxml')    
    books_lst = []    
    name = soup.find('div',class_='listmain')
    #父div,子dl,孙dt(总标题)和dd(每一章)
    if name:
        dd_items = name.find('dl')
        dt_num = 0
        for n in dd_items.children:
            ename = str(n.name).strip()
            if ename == 'dt':
                dt_num += 1
            if ename != 'dd':
                continue
            books_info = {}
            if dt_num == 2:
                durls = n.find_all('a')[0]
                books_info['name'] = durls.get_text()
                books_info['url'] = 'http://www.biqukan.com' + durls.get('href')
                books_lst.append(books_info)
    return books_lst