python实例8-爬取猫眼电影TOP100榜所有信息

import requests
from requests.exceptions import RequestException
import re
import json
from multiprocessing import Process,Manager,Lock,Pool
import io


headers={'User-Agent':'Mozilla/5.0 '}

def get_one_page(url):
    try:
        res = requests.get(url,headers = headers)
        if res.status_code == 200:
            return res.text
        return None
    except RequestException:
        return None

def parse_one_page(html):
    pattern = re.compile('
.*?board-index.*?>(\d+).*?data-src="(.*?)".*?name">(.*?).*?star">(.*?)
.*?releasetime">(.*?)
' + '.*?integer">(.*?).*?fraction">(.*?).*?
',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 io.open('result.txt','a',encoding='utf-8') as f:
        f.write(json.dumps(content,ensure_ascii=False)+'\n')
        f.close()
        
def main(offset):
    url = 'http://maoyan.com/board/4?offset=' + str(offset)
    html = get_one_page(url)
    for item in parse_one_page(html):
        print(item)
        write_to_file(item)

if __name__ == '__main__':
    p=Pool()
    #p.map(main,[i*10 for i in range(10)])
    for i in range(10):    
        main(i*10)