《Python第二版》中爬虫文件的问题

哈哈怪

这一段代码 是小甲鱼老师改的爬百度贴吧上图片的 这里代码的问题看不懂

1. import urllib.request
   
2. import re
   
3. import os
   
4. import requests
   
5. 
   
6. def open_url(url):
   
7.     req = urllib.request.Request(url)
   
8.     req.add_header('User-Agent','Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36')
   
9.     page = urllib.request.urlopen(req)
   
10.     html = page.read().decode('utf-8')
    
11.     return html
    
12. 
    
13. 
    
14. def get_img(html):
    
15.     p = r'<img class="BDE_Image".*?src="[^"]*\.jpg)".*?>'
    
16.     imglist = re.findall(p,html)
    
17. 
    
18.     try:
    
19.         os.mkdir('NewPics')
    
20.     except FileExistsError:
    
21.         pass
    
22. 
    
23.     os.chdir('NewPics')
    
24. 
    
25.     for each in imglist:
    
26.         filename = each.split("/")[-1]
    
27.         urllib.request.urlretrieve(each,filename,None)
    
28. 
    
29. if __name__=='__main__':
    
30.     url = 'http://tieba.baidu.com/p/3823765471'
    
31.     get_img(open_url(url))
    

复制代码

但是最后报错的内容我看不懂

哈哈怪

File "F:\python\lib\re.py", line 223, in findall
    return _compile(pattern, flags).findall(string)
  File "F:\python\lib\re.py", line 286, in _compile
    p = sre_compile.compile(pattern, flags)
  File "F:\python\lib\sre_compile.py", line 764, in compile
    p = sre_parse.parse(p, flags)
  File "F:\python\lib\sre_parse.py", line 944, in parse
    raise source.error("unbalanced parenthesis")
re.error: unbalanced parenthesis at position 40

没见过这一段报错 请问各位大佬这个怎么改