python 'NoneType' object has no attribute 'find'

这个错误是因为在你的代码中，变量 `bs` 是一个 NoneType 对象，而不是一个 BeautifulSoup 对象。因此，无法调用 `find` 或 `find_all` 方法。这个问题通常是由于加载网页过快，导致网页内容没有被完全加载而引起的。你可以通过添加延时或者设置超时时间来解决这个问题。在你的代码中，你可以尝试使用 `time.sleep()` 函数来添加延时，或者在请求中设置 `timeout` 参数来等待页面加载完全。例如：

import time
import requests
from bs4 import BeautifulSoup

url = 'https://movie.douban.com/top250?start=0&filter='
res = requests.get(url, headers=self.headers, timeout=5)
time.sleep(5)  # 添加延时等待页面加载完全
html = res.text
soup = BeautifulSoup(html,'html.parser')
bs = soup.find('ol', class_='grid_view')
numbers = bs.find_all('li')
print(type(numbers))

这样做可以确保页面完全加载后再进行解析，避免了 'NoneType' object has no attribute 'find' 的错误。<em>1</em><em>2</em><em>3</em>
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