爬取校园新闻首页的新闻
1. 用requests库和BeautifulSoup库，爬取校园新闻首页新闻的标题、链接、正文。
url = "http://news.gzcc.cn/html/xiaoyuanxinwen/"
res = requests.get(url);
res.encoding = "utf-8"
soup = BeautifulSoup(res.text,"html.parser");
for news in soup.select("li"):
if len(news.select(".news-list-title"))>0: #排除为空的li
time = news.select(".news-list-info")[0].contents[0].text
title = news.select(".news-list-title")[0].text
description = news.select(".news-list-description")[0].text
a = news.select('a')[0].attrs['href']
detail_res = requests.get(a)
detail_res.encoding = "utf-8"
detail_soup = BeautifulSoup(detail_res.text, "html.parser")
print(detail_soup.select("#content")[0].text)#正文
print(time, title, description, a)
content = detail_soup.select("#content")[0].text
info = detail_soup.select(".show-info")[0].text
date_time = info.lstrip('发布时间:')[:19]
print(info)
break
2. 分析字符串，获取每篇新闻的发布时间，作者，来源，摄影等信息。
info = '发布时间:2018-04-01 11:57:00 作者：陈流芳 审核：权麟春 来源：马克思主义学院 点击：次'
detail_time = info.lstrip('发布时间:')[:19]
sh = info[info.find("审核"):].split()[0].lstrip('审核：')
print(detail_time,sh)
3. 将其中的发布时间由str转换成datetime类型。
# 获取当前的时间
now_time = datetime.now();
now_time.year
# 将字符串转化为时间
print(datetime.strptime(date_time,"%Y-%m-%d %H:%M:%S"))
# 将时间转化为字符串
print(now_time.strftime('%Y\%m\%d'))
4. 将完整的代码及运行结果截图发布在作业上。
import requests
from bs4 import BeautifulSoup
from datetime import datetime
url = "http://news.gzcc.cn/html/xiaoyuanxinwen/"
res = requests.get(url);
res.encoding = "utf-8"
soup = BeautifulSoup(res.text,"html.parser");
for news in soup.select("li"):
if len(news.select(".news-list-title"))>0: #排除为空的li
time = news.select(".news-list-info")[0].contents[0].text
title = news.select(".news-list-title")[0].text
description = news.select(".news-list-description")[0].text
a = news.select('a')[0].attrs['href']
detail_res = requests.get(a)
detail_res.encoding = "utf-8"
detail_soup = BeautifulSoup(detail_res.text, "html.parser")
print(detail_soup.select("#content")[0].text)#正文
print(time, title, description, a)
content = detail_soup.select("#content")[0].text
info = detail_soup.select(".show-info")[0].text
date_time = info.lstrip('发布时间:')[:19]
print(info)
break
info = '发布时间:2018-04-01 11:57:00 作者：陈流芳 审核：权麟春 来源：马克思主义学院 点击：次'
detail_time = info.lstrip('发布时间:')[:19]
sh = info[info.find("审核"):].split()[0].lstrip('审核：')
print(detail_time,sh)
# # 多个名字查找作者
info1 = '发布时间:2018-04-01 11:57:00 作者：陈流芳 许健杰 审核：权麟春 来源：马克思主义学院 点击：次 '
info1 = info1[info1.find("作者"):info1.find('审核：')].lstrip('作者：').split()[1]
print(info1)
# 获取当前的时间
now_time = datetime.now();
now_time.year
# 将字符串转化为时间
print(datetime.strptime(date_time,"%Y-%m-%d %H:%M:%S"))
# 将时间转化为字符串
print(now_time.strftime('%Y\%m\%d'))
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