def parseHtml(html):    soup = BeautifulSoup(html, 'lxml')    # print(soup.prettify)格式化输出    # items = soup.find_all('div', attrs={'class': 'news-list-b'})    # items = soup.select('Tag')#CSS选择器    # items = soup.select('.class')属性    # items = soup.select('#id')ID    # items = soup.select('Tag[attr="属性值"]')标签+属性    # items = soup.select('.class Tag #id')空格表示子节点，组合使用    # items = soup.select('Tag').text取文本    # items = soup.select('Tag').get_text()取文本    # tag.get('className')取标签属性    # tag['className']取标签属性    # tag.attrs.get('className')取标签属性    items = soup.select('.news-list-b .list .item .title a')    for item in items:        yield item.get('href')#attrs字典取属性

CSS选择器 子串匹配 模糊匹配

soup = BeautifulSoup(html, 'lxml')trs = soup.select('#table_live tr[id*="tr1"]')#id包含“tr1”字符串的tr标签#soup.select('tag[attr="属性值"]') #标签+属性

tags = soup.select('li[id^="newsLi"]') #标签+属性，id属性以newsLi开头

tags = soup.select('li[id$="newsLi"]') #标签+属性，id属性以newsLi结尾

tags = soup.select('li[id*="newsLi"]') #标签+属性，id属性包含newsLi

 select带有空格的class

#div class=’content-list latest-content’#div class=’content-list hot-content’tags = soup.select('div.content-list.latest-content')