爬取百度问答目的分析网页总结

主要页面（获得url）
页面1：https://zhidao.baidu.com/search?word=5G&ie=gbk&site=-1&sites=0&date=4&pn=0
页面2：https://zhidao.baidu.com/search?word=5G&ie=gbk&site=-1&sites=0&date=4&pn=10
数据页面（获得问题和答案）
https://zhidao.baidu.com/question/1116524242596320819.html?fr=iks&word=5G&ie=gbk
https://zhidao.baidu.com/question/1760121401250070668.html?fr=iks&word=5G&ie=gbk

http://zhidao.baidu.com/question/461385357861423285.html?fr=iks&word=5G&ie=gbk

//*[@id="wgt-ask"]/h1
//*[@id="answer-2965098849"]/div[2]


问题1：需要返回列表中最长的元素

url = "https://zhidao.baidu.com/search?word=5G&ie=gbk&site=-1&sites=0&date=4&pn=0"
    data = url_open(url)
    # html = etree.HTML(data)
    # result = etree.tostring(html, pretty_print=True, encoding="utf-8").decode("utf-8")
    # dom3 = html.xpath("//*[@class='dt mb-4 line']/a/href")
    # print(dom3)
    # print(result)
    # sys.exit(0)
    soup = BeautifulSoup(data, 'html.parser')
    html = soup.find(id="wgt-list").find_all("dt")
    html = [i.find("a")["href"] for i in html]
    print(html)

 url="http://zhidao.baidu.com/question/461385357861423285.html?fr=iks&word=5G&ie=gbk"
    data = url_open(url)
    soup = BeautifulSoup(data, 'html.parser')

    question = soup.find(class_="ask-title").text
    content = soup.find(class_="line content").text
    content = content.split("\n")
    index01 = content.index(sorted(content, key=lambda k: len(k), reverse=True)[0])
    print(question)
    print(content[index01])