from lxml import etree
import requests
import csv

fp = open('C://Users/123/Desktop/doubanbook.csv','wt',newline='',encoding='utf-8')
writer = csv.writer(fp)
writer.writerow(('name', 'url',  'author', 'publisher', 'date', 'price', 'rate', 'comment'))

urls = ['https://book.douban.com/top250?start={}'.format(str(i)) for i in range(0,250,25)]

headers = {
    'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36'
}

for url in urls:
    html = requests.get(url,headers=headers)
    selector = etree.HTML(html.text)
    infos = selector.xpath('//tr[@class="item"]')
    for info in infos:
        name = info.xpath('td/div/a/@title')[0]
        url = info.xpath('td/div/a/@href')[0]
        book_infos = info.xpath('td/p/text()')[0]
        author = book_infos.split('/')[0]
        date = book_infos.split('/')[-2]
        price = book_infos.split('/')[-1]
        rate = info.xpath('td/div/span[2]/text()')[0]
        comments = info.xpath('td/p/span/text()')
        comment = comments[0] if len(comments) != 0 else "空"
        writer.writerow((name,url,author,date,price,rate,comment))

fp.close()