python爬电影排名用os bs4_编写python脚本利用requests+bs4模块爬取豆瓣电影top250的数据...

好的，您可以参考以下代码实现：

import requests
from bs4 import BeautifulSoup
import os

# 获取豆瓣电影top250的页面信息
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/537.3'}
    try:
        response = requests.get(url, headers=headers)
        if response.status_code == 200:
            return response.text
    except requests.RequestException:
        return None

# 解析页面信息，获取电影信息
def parse_html(html):
    soup = BeautifulSoup(html, 'lxml')
    movies = []
    for item in soup.find_all('div', class_='item'):
        movie = {}
        movie['rank'] = item.em.text
        movie['title'] = item.find('span', class_='title').text
        movie['score'] = item.find('span', class_='rating_num').text
        movie['quote'] = item.find('span', class_='inq').text
        movies.append(movie)
    return movies

# 将电影信息保存到本地文件中
def save_to_file(movies):
    if not os.path.exists('./douban_movies'):
        os.mkdir('./douban_movies')
    with open('./douban_movies/top250.txt', 'w', encoding='utf-8') as f:
        for movie in movies:
            f.write('排名：{}\n电影名称：{}\n评分：{}\n简介：{}\n\n'.format(movie['rank'], movie['title'], movie['score'], movie['quote']))

# 爬取豆瓣电影top250的数据
def main():
    url = 'https://movie.douban.com/top250'
    html = get_html(url)
    movies = parse_html(html)
    save_to_file(movies)

if __name__ == '__main__':
    main()

该脚本会爬取豆瓣电影top250的排名、电影名称、评分和简介，并将其保存到本地文件中。您可以根据自己的需求进行修改。