python实现爬虫数据存到 MongoDB

# coding=utf-8

import re
import requests
from lxml import etree
import pymongo
import sys

reload(sys)
sys.setdefaultencoding('utf-8')

def getpages(url, total):
  nowpage = int(re.search('(\d+)', url, re.S).group(1))
  urls = []

  for i in range(nowpage, total + 1):
    link = re.sub('(\d+)', '%s' % i, url, re.S)
    urls.append(link)

  return urls

def spider(url):
  html = requests.get(url)

  selector = etree.HTML(html.text)

  book_name = selector.xpath('//*[@id="container"]/ul/li//div/div[2]/a/text()')
  book_author = selector.xpath('//*[@id="container"]/ul/li//div/div[2]/div/a/text()')

  saveinfo(book_name, book_author)

def saveinfo(book_name, book_author):
  connection = pymongo.MongoClient()
  BookDB = connection.BookDB
  BookTable = BookDB.books

  length = len(book_name)

  for i in range(0, length):
    books = {}
    books['name'] = str(book_name[i]).replace('\n','')
    books['author'] = str(book_author[i]).replace('\n','')
    BookTable.insert_one(books)

if __name__ == '__main__':
  url = 'http://readfree.me/shuffle/?page=1'
  urls = getpages(url,3)

  for each in urls:
    spider(each)