python crawling information and save to csv

import csv
import requests
from bs4 import BeautifulSoup
res=requests.get('http://books.toscrape.com/catalogue/category/books/travel_2/index.html')
html=res.text
soup=BeautifulSoup(html,'html.parser')
maindiv=soup.find_all(class_="col-xs-6 col-sm-4 col-md-3 col-lg-3")
f = open('hhh.csv','w',newline='',encoding='utf-8')
csv_writer = csv.writer(f)
csv_writer.writerow(['名称','价格','评价'])
for item in maindiv:
    linedata1=[];
    namediv=item.find('h3')
    name=namediv.find('a')
    # print('名称：'+name['title'])
    price=item.find(class_="price_color")
    # print('价格：'+price.text)
    pf=item.find(class_="star-rating")
    # print('好评数：'+pf.attrs['class'][1])
    linedata1.append(name['title'])
    linedata1.append(price.text)
    linedata1.append(pf.attrs['class'][1])
    csv_writer.writerow(linedata1)