python爬虫

用python3 从 猫眼电影中爬榜单前100的数据

#__time__='2018/4/17 16:46'
# -*- coding:utf-8 -*-

import requests
import re
import json
from requests.exceptions import RequestException
import time

def get_one_page(url):
    headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 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+)</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].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='utf8') as f:
        # print(type(json.dumps(content)))
        f.write(json.dumps(content, ensure_ascii=False) + '
')

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(offset=i * 10)
        time.sleep(1)

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