python requests 正则爬虫-python爬虫教程requests

代码：

import requests
from multiprocessing import Pool
from requests.exceptions import RequestException
import re
import json
def get_one_page(url):
try:
if url==”:
return None
response=requests.get(url)
if response.status_code==200:
return response.text
return None
except RequestException:
return None

def parse_one_page(html):
if html==”:
return None
pattern=re.compile(‘<dd>.*?board-index.*?>(d+)</i>.*?data-src=”(.*?)”.*?name”><a’
+’.*?>(.*?)</a>.*?star”>(.*?)</p>.*?releasetime”>(.*?)</p>’
+’.*?integer”>(.*?)</i>.*?fraction”>(.*?)</i>.*?</dd>’,re.S)
items=re.findall(pattern,html)
for item in items:
yield {
‘index’:item[0],
‘image’:item[1],
‘title’:item[2],
‘actor’:item[3].strip()[3:],
‘time’:item[4].strip()[5:],
‘score’:item[5]+item[6]
}

def write_to_file(content):
with open(‘result.txt’,’a’,encoding=’utf-8′) as f:#a往后追加
f.write(json.dumps(content,ensure_ascii=False)+’ ’)
f.close()

def main(offset):
url=’http://maoyan.com/board/4?offset=’+str(offset)
html=get_one_page(url) # 得到html
for item in parse_one_page(html):
print(item)
write_to_file(item)

if __name__==’__main__’:
# for i in range(10):
# main(i*10)
pool=Pool() #多线程
pool.map(main,[i*10 for i in range(10)])