学会使用正则表达式
1. 用正则表达式判定邮箱是否输入正确。
import re r ='^(\w)+(\.\w+)*@(\w)+((\.\w{2,3}){1,3})$' e ='1546122489@qq.com' if re.match(r,e): print(re.match(r,e).group(0)) else: print('error')
2. 用正则表达式识别出全部电话号码
import re str ='''020-82876130 版权所有:广州商学院 地址:广州市黄埔区九龙大道206号 学校办公室:020-82876130 招生电话:020-82872773 校外办公室0724-4263864 粤公网安备 44011602000060号 粤ICP备15103669号 ''' number=re.findall('(\d{3,4})-(\d{6,8})',str) print(number)
3. 用正则表达式进行英文分词。re.split('',news)
import re news = '''Failure is probably the fortification in your pole. It is like a peek your wallet as the thief, when you are thinking how to spend several hard-won lepta, when you are wondering whether new money, it has laid background.''' word = re.split('[\s,.?\-]+',news) print(word)
4. 使用正则表达式取得新闻编号
import re newsUrl = 'http://news.gzcc.cn/html/2017/xiaoyuanxinwen_095/8249.html' num=re.search('\_(.*).html',newsUrl).group(1) print(num)
5. 生成点击次数的Request URL
import re newsUrl = 'http://news.gzcc.cn/html/2017/xiaoyuanxinwen_095/8249.html' newsId = re.search('\_(.*).html', newsUrl).group(1).split('/')[-1] res = 'http://oa.gzcc.cn/api.php?op=count&id=8249&modelid=80'.format(newsId) print(res)
6. 获取点击次数
import requests import re newsUrl = 'http://news.gzcc.cn/html/2017/xiaoyuanxinwen_095/8249.html' newsId=re.search('\_(.*).html', newsUrl).group(1).split('/')[-1] res = requests.get('http://oa.gzcc.cn/api.php?op=count&id=8249&modelid=80'.format(newsId)) ClickCount=(int(res.text.split('.html')[-1].lstrip("(')").rstrip("');"))) print(ClickCount)
7. 将456步骤定义成一个函数 def getClickCount(newsUrl):
def getClickCount(newsUrl): newsId=re.search('\_(.*).html', newsUrl).group(1).split('/')[-1] res = requests.get('http://oa.gzcc.cn/api.php?op=count&id=8249&modelid=80'.format(newsId)) ClickCount = (int(res.text.split('.html')[-1].lstrip("(')").rstrip("');"))) return ClickCount
8. 将获取新闻详情的代码定义成一个函数 def getNewDetail(newsUrl):
def getNewsDetail(newsUrl): resd = requests.get(newsUrl) resd.encoding = 'utf-8' soupd = BeautifulSoup(resd.text, 'html.parser') # 打开新闻详情页 title = soupd.select('.show-title')[0].text info = soupd.select('.show-info')[0].text # c = soupd.select('#content')[0].text # 正文 dt = info.lstrip('发布时间:')[:19] # 发布时间 dati = datetime.strptime(dt, '%Y-%m-%d %H:%M:%S') if info.find('作者:') > 0: source = info[info.find('作者:'):].split()[0].lstrip('作者:') # 作者 else: source = 'none' content = soupd.select('.show-content')[0].text.strip() click = getClickCount(newsUrl) print(dati, title, newsUrl, source, click)
9. 取出一个新闻列表页的全部新闻 包装成函数def getListPage(pageUrl):
def getListPage(pageUrl): res = requests.get(pageUrl) res.encoding = 'utf-8' soup = BeautifulSoup(res.text,'html.parser') for news in soup.select('li'): if len(news.select('.news-list-title')) > 0: newsUrl = news.select('a')[0].attrs['href'] # 链接 getNewsDetail(newsUrl)
10. 获取总的新闻篇数,算出新闻总页数包装成函数def getPageN():
def getPageN(): res = requests.get('http://news.gzcc.cn/html/xiaoyuanxinwen/') res.encoding = 'utf-8' soup = BeautifulSoup(res.text, 'html.parser') pagenumber=int(soup.select('.a1')[0].text.rstrip('条')) page = int(soup.select('.a1')[0].text.rstrip('条'))//10+1 return page
11. 获取全部新闻列表页的全部新闻详情。
n=getPageN() for i in range(1,n+1): pageUrl = 'http://news.gzcc.cn/html/xiaoyuanxinwen/' getListPage(pageUrl)