求助！如何爬取当当网畅销榜图书的折扣，就差这一个

import requests
from bs4 import BeautifulSoup
import re
import csv

headers = {‘User-Agent’: ‘Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3314.0 Safari/537.36 SE 2.X MetaSr 1.0’}

def getHTMLText(url):
try:
r = requests.get(url, headers=headers)
r.raise_for_status()
r.encoding = r.apparent_encoding
return r.text
except Exception as e:
print(e)

def getBookInfo(html, lst):
soup = BeautifulSoup(html, ‘html.parser’)
tag_ul = soup.find(‘ul’, attrs={‘class’: ‘bang_list clearfix bang_list_mode’})
tag_li = tag_ul.find_all(‘li’)
for book in tag_li:
book_info = {}

    book_rank = book.find('div', attrs={'class': re.compile('list_num$')})book_name = book.find('div', attrs={'class': 'name'}).abook_comments = boo

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