照葫芦画瓢之爬虫豆瓣top100

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

def get(url):
    try:
        headers = {
            'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36'
        }
        response = requests.get(url,headers = headers)
        if response.status_code == 200:
            return response.text
        return None
    except RequestException:
        return None
def parse(html):
    patter = re.compile('<li.*?cover.*?href="(.*?)"\stitle="(.*?)">.*?more-meta.*?author">(.*?)</span>.*?year">(.*?)</span>.*?publisher">(.*?)</span>.*?</li>',re.S)
    items = re.findall(patter,html)
    for i in items:
        yield {
            'url': i[0],
            'title': i[1],
            'name': i[2].strip(),
            'date': i[3].strip(),
            'pulisher': i[4].strip()
        }
def  write_to_file (content):
    with open('result.txt','a',encoding='utf-8') as f:
        f.write(json.dumps(content,ensure_ascii=0)+'\n')
        f.close()
def main():
    url = 'https://book.douban.com/'
    html = get(url)
    for i in parse(html):
        print(i)
        write_to_file(i)

if __name__ == '__main__':
    main()