#利用requests和正则抓取猫眼电影网上排名前100的电影

import requests

from requests.exceptions import RequestException

import re

import json

from multiprocessing import Pool

def get_one_page(url):

    try:

        #需要重置requests的headers,否则猫眼电影拒绝访问。

        headers = {

            "user-agent": 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36'}

        response = requests.get(url,headers=headers)

    #加一个判断，判断请求URL是否成功

        if response.status_code == 200:

            return response.text

        return None

    except RequestException:

        return None

def parse_one_page(html):

    #解析网页的html代码

    pattern = re.compile('<dd>.*?board-index-1.*?>(\d+)</i>.*?src="(.*?)".*?name"><a'

                         '.*?>(.*?)</a>.*?star">(.*?)</p>.*?releasetime">(.*?)</p>'

                         '.*?integer">(.*?)</i>.*?fraction">(.*?)</i>.*?</dd>',re.S)

    items = re.findall(pattern,html)

    #print(items)

    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') as f:

        f.write(json.dumps(content)+'\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)

    # print(html)

if __name__ == '__main__':

#设置多进程抓取

    pool = Pool()

    pool.map(main,[i*10 for i in range(10)])