はてなブックマークをrequests,BeatifulSoupでスクレイピング

hatena.py

from bs4 import BeautifulSoup
import requests
import time

url = 'http://b.hatena.ne.jp/search/text?safe=on&q=Python&users=50'

for n in range(3): # 3ページで中断
    res = requests.get(url)
    soup = BeautifulSoup(res.content, features='lxml')

    if len(soup.select('.pager-next')) > 0:
        posts = soup.select('.search-result')
        for post in posts:
            title = post.select_one('h3').text.strip()
            date = post.select_one('.created').text.strip()
            bookmarks = post.select_one('.users span').text.strip()
            print(title, date, bookmarks)

        btn_qs = soup.select_one('a.pager-next').attrs['href']
        url = 'http://b.hatena.ne.jp/search/text' + btn_qs
        time.sleep(3)
    else:
        break