求助，为什么输出的文件里没有内容

import requests
from bs4 import BeautifulSoup
import csv
# 提取电影信息
def movies_spider():
movie_url = "https://movie.douban.com/top250?start={}&filter="
movie_num = 0
movie_name = '名称'
movie_year = '年份'
movie_country = '国家'
movie_type = '类型'
movie_director = '导演'
movie_assess = '评价人数'
movie_score = '评分'
f = open('movies.csv', 'w', newline='', encoding='utf-8')
writer = csv.writer(f)
writer.writerow([
movie_num, movie_name, movie_year, movie_country, movie_type,
movie_director, movie_assess, movie_score
])
for list in range(10):
movie_content = requests.get(movie_url.format(list * 25)).text
soup = BeautifulSoup(movie_content, 'lxml')
for li in soup.select('ol li'):
movie_num = li.select('em')[0].string
movie_name = li.select('.title')[0].string
movie_info = li.select('.bd .')[0].get_text().strip().split('\xa0/\xa0') # 电影信息
movie_year = movie_inf