爬虫Day3

用到的网页--豆瓣电影Top250

需要爬取信息：

数据保存在网页源代码中，是服务加载方式。先拿到网页源代码--request。再通过re提取想要的信息---re。

新知识：用csv存数据，可以用excel表格展示数据

import csv
result = obj.finditer(page_content)
f = open("data.csv",mode="w")
csvwriter = csv.writer(f)
for it in result:
     dic = it.groupdict()#把数据全都扔到字典里
    dic['year'] = dic['year'].strip()
    csvwriter.writerow(dic.values())
f.close()
resp.close()
print("over!")

注意：在pycharm里要对文件用utf-8重新编码，如果要用excel显示时要换回ansi编码，两者颠倒会乱码。

代码：

import requests
import re
import csv

#将数据存储，存储时以逗号为分割
#肖申克的救赎,1994,9.7,3001556人评价
url = "https://movie.douban.com/top250"
headers = {
"User-Agent":
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36"
}
resp = requests.get(url,headers = headers)
#拿到网页源代码
#print(resp.text)
page_content = resp.text
#解析数据，写正则表达式
obj = re.compile(r'<li>.*?<div class="item">.*?<span class="title">(?P<name>.*?)</span>.*?'
                 r'<p class="">.*?<br>(?P<year>.*?)&nbsp.*?<span class="rating_num" property="v:average">'
                 r'(?P<grade>.*?)</span>'
                 r'.*?<span>(?P<conment>.*?)</span>',re.S)
result = obj.finditer(page_content)
f = open("data.csv",mode="w")
csvwriter = csv.writer(f)

for it in result:
    # print(it.group("name"),end="    ")
    # print(it.group("year").strip(),end="    ")
    # print(it.group("grade"),end="   ")
    # print(it.group("conment"))
    #将数据整理成字典的格式
    dic = it.groupdict()#把数据全都扔到字典里
    dic['year'] = dic['year'].strip()
    csvwriter.writerow(dic.values())

f.close()
resp.close()
print("over!")