dangdang_test.py

'''
https://zhuanlan.zhihu.com/p/55980398
'''
import re
import json
import requests

def main(page):
   url = 'http://bang.dangdang.com/books/fivestars/01.00.00.00.00.00-recent30-0-0-1-' + str(page)
   html = request_dangdang(url)
   items = parse_result(html) # 解析过滤我们想要的信息
   
   for item in items:
       write_item_to_file(item)
       #print(item)

def request_dangdang(url):
   try:
       response = requests.get(url)
       if response.status_code == 200:
           return response.text
   except requests.RequestException:
       return None

def parse_result(html):
   pattern = re.compile('<li>.*?list_num.*?(\d+).</div>.*?<img src="(.*?)".*?class="name".*?title="(.*?)">.*?class="star">.*?class="tuijian">(.*?)</span>.*?class="publisher_info">.*?target="_blank">(.*?)</a>.*?class="biaosheng">.*?<span>(.*?)</span></div>.*?<p><span\sclass="price_n">&yen;(.*?)</span>.*?</li>',re.S)
   items = re.findall(pattern,html)
   for item in items:
       yield {
           'range': item[0],
           'image': item[1],
           'title': item[2],
           'recommend': item[3],
           'author': item[4],
           'times': item[5],
           'price': item[6]
       }

def write_item_to_file(item):
   #print('开始写入数据 ====> ' + str(item))
   with open('book.txt', 'a', encoding='UTF-8') as f:
       f.write(json.dumps(item, ensure_ascii=False) + '\n')
       f.close()

if __name__ == "__main__":
   for i in range(1,26):
       main(i)