[感想]Web crawler with Python - 03.豆瓣电影TOP250

AttributeError: ‘NoneType‘ object has no attribute ‘find‘  #‘nonetype‘的对象没有属性发现

import requests
from bs4 import BeautifulSoup

def Download_page(url):
    date = requests.get(url).content
    soup = BeautifulSoup(date, ‘lxml‘)

    movie_list_soup = soup.find(‘ol‘,attrs={‘class‘,‘grid_view‘})

    movie_name_list = []
    for movie_li in movie_list_soup.find_all(‘li‘):
        detail = movie_li.find(‘div‘,attrs={‘class‘,‘hd‘})
        movie_name = detail.find(‘span‘,attrs={‘class‘,‘title‘})
        movie_name_list.append(movie_name.text)

    next_page = down_url+soup.find(‘span‘,attrs={‘class‘,‘next‘}).find(‘a‘)[‘href‘]  #出错在这里
    if next_page:
        return movie_name_list,next_page
    return movie_name_list,None

down_url = ‘https://movie.douban.com/top250‘
url = down_url
with open(‘G://movie_name_top250.txt‘, ‘w‘) as f:
    while url:
        movie,url = Download_page(url)
        Download_page(url)
        f.write(str(movie))

#!/usr/bin/env python
# encoding=utf-8

"""
爬取豆瓣电影TOP250 - 完整示例代码
"""

import codecs

import requests
from bs4 import BeautifulSoup

DOWNLOAD_URL = ‘http://movie.douban.com/top250/‘


def download_page(url):
    return requests.get(url, headers={
        ‘User-Agent‘: ‘Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.80 Safari/537.36‘
    }).content


def parse_html(html):
    soup = BeautifulSoup(html)
    movie_list_soup = soup.find(‘ol‘, attrs={‘class‘: ‘grid_view‘})

    movie_name_list = []

    for movie_li in movie_list_soup.find_all(‘li‘):
        detail = movie_li.find(‘div‘, attrs={‘class‘: ‘hd‘})
        movie_name = detail.find(‘span‘, attrs={‘class‘: ‘title‘}).getText()

        movie_name_list.append(movie_name)

    next_page = soup.find(‘span‘, attrs={‘class‘: ‘next‘}).find(‘a‘)
    if next_page:
        return movie_name_list, DOWNLOAD_URL + next_page[‘href‘]
    return movie_name_list, None


def main():
    url = DOWNLOAD_URL

    with codecs.open(‘movies‘, ‘wb‘, encoding=‘utf-8‘) as fp:
        while url:
            html = download_page(url)
            movies, url = parse_html(html)
            fp.write(u‘{movies}\n‘.format(movies=‘\n‘.join(movies)))


if __name__ == ‘__main__‘:
    main()