douban_movies.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import codecs
import requests
from bs4 import BeautifulSoup

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


def download_page(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'}
    data = requests.get(url, headers = headers).content
    return data


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

    movie_name_lst = []

    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'}).text
        movie_name_lst.append(movie_name)

    next_page = soup.find('span', attrs={'class': 'next'}).find('a')
    if next_page:
        return movie_name_lst, DOWNLOAD_URL + next_page['href']
    return movie_name_lst, 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()