python爬虫从入门到放弃（九）之 Requests+正则表达式爬取猫眼电影TOP100

时间：2021-03-02 20:01:42
import requests

from requests.exceptions import RequestException

import re

import json

from multiprocessing import Pool

def get_one_page(url):

    headers={'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36'}

    try:

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

        if response.status_code == 200:

            return response.text

        return None

    except RequestException:

        return None

def parse_one_page(html):

    pattern = re.compile('<dd>.*?board-index.*?>(\d+).*?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].strip(),

        'actor': item[3].strip()[3:] ,#if len(item[3]) > 3 else '',

        'time': item[4].strip()[5:] ,#if len(item[4]) > 5 else '',

        'score': item[5].strip() + item[6].strip()

        }

def write_to_file(content):

    with open('result.txt', 'a', encoding='utf-8') as f:

        f.write(json.dumps(content, ensure_ascii=False) + '\n')

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__':

#for i in range(10):

#main(i * 10)

# 多线程方法

    pool =Pool()#多线程会打乱数据的顺序

    # 声明一个进程池

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

    pool.close()

相关文章