"""
filename: maoyantop100/spider.py
python: 3.7.0
description: 使用requests和正则爬取猫眼电影
author: master
ide: pycharm
"""

import requests
import re
import json

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36',
    # 'Host': 'maoyan.com',
    # 'Upgrade-Insecure-Requests': '1',
    # 'Referer': 'http://maoyan.com/board',
    # 'Connection': 'keep-alive',
}

def crawl_one_page(url):
    # 需要User-agent标识，否则返回403
    response = requests.get(url, headers=headers)
    if response.status_code == 200:
        return response.text
    else:
        return "status code :" + str(response.status_code)

def parse_one_page(content):
    # 可以把要匹配的一段源码复制出来，把不需要的用.*?代替，需要的用(.*?)代替，注意唯一匹配就好
    pattern = re.compile('<dd>.*?board-index-.*?">(.*?)</i>.*?'
                         +'data-src="(.*?)".*?class="name".*?'
                         +'data-val.*?>(.*?)</a>.*?'
                         +'star">\s*?主演：(.*?)\s*?</p>.*?'
                         +'releasetime">上映时间：(.*?)</p>.*?'
                         +'integer">(.*?)</i><i class="fraction">(.*?)</i></p>', re.S)
    items = pattern.findall(content)

    # 规则返回
    for item in items:
        yield {
            'index': item[0],
            'image_url': item[1],
            'title': item[2],
            'protagonist': item[3].split(','),
            'date': item[4],
            'grade': item[5]+item[6]
        }

def save_one_pagr(fo, item):
    # 写入文件，不要编码为ascii，中文会乱码
    data = json.dumps(item, ensure_ascii=False) + '\n'
    fo.write(data)

def main():
    # 找到每一页的规律
    start_url = "http://maoyan.com/board/4?offset="
    # 文件对象，追加，使用utf8编码写入
    fo = open('result.txt', 'a', encoding='utf8')

    # 这里只有10页
    for i in range(10):
        url = start_url + str(i*10)
        html = crawl_one_page(url)

        # 查看进度
        print("[+] " + url)

        # yield返回的是迭代器，保存到文件
        for item in parse_one_page(html):
            save_one_pagr(fo, item)

    # 只打开一次，节省资源
    fo.close()

if __name__ == '__main__':
    main()

结果：

{"index": "1", "image_url": "http://p1.meituan.net/movie/20803f59291c47e1e116c11963ce019e68711.jpg@160w_220h_1e_1c", "title": "霸王别姬", "protagonist": ["张国荣", "张丰毅", "巩俐"], "date": "1993-01-01", "grade": "9.6"}

image.png