BeautifulSoup安装使用

请问下为什么

#爬取douban电影
```python
import requests
from bs4 import BeautifulSoup4
import time

header={
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36'
}

url='https://movie.douban.com/top250'
html=requests.get(url,headers=header)
soup=BeautifulSoup4(html.text,'html.parser')
name=soup.select('#content > div > div.article > ol > li:nth-child(2) > div > div.info > div.hd > a > span.title')
print(name)

异常结果

```
cannot import name 'BeautifulSoup4' from partially initialized module 'bs4'
请问下原因，我查的说python3不能使用BeautifulSoup了？

from bs4 import BeautifulSoup