写一个Python程序实现爬取豆瓣电影top250

好的，以下是Python代码实现爬取豆瓣电影top250的步骤：

1. 导入必要的库

import requests
from bs4 import BeautifulSoup

2. 定义函数，获取页面信息

def get_html(url):
    headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36'}
    response = requests.get(url, headers=headers)
    html = response.text
    return html

3. 定义函数，解析页面信息

def parse_html(html):
    soup = BeautifulSoup(html, 'html.parser')
    movie_list = soup.find('ol', class_='grid_view').find_all('li')
    result = []
    for movie in movie_list:
        name = movie.find('span', class_='title').text
        rating = float(movie.find('span', class_='rating_num').text)
        comments = int(movie.find('div', class_='star').find_all('span')[3].text[:-3])
        result.append((name, rating, comments))
    return result

4. 定义函数，存储数据到文件

def save_data(data):
    with open('top250.txt', 'w', encoding='utf-8') as f:
        for item in data:
            f.write(item[0] + '\t' + str(item[1]) + '\t' + str(item[2]) + '\n')

5. 主函数，爬取top250并存储数据到文件

if __name__ == '__main__':
    url = 'https://movie.douban.com/top250'
    data = []
    for i in range(0, 10):
        html = get_html(url + '?start=' + str(i * 25))
        result = parse_html(html)
        data += result
    save_data(data)

这样就实现了爬取豆瓣电影top250的功能，数据存储在top250.txt文件中。