写出的爬图py老是出错，请指正

huahua_0917

根据小甲鱼书上和网站视频讲述，完全复制的代码，但是为什么会出错？
代码如下：
import urllib.request
import re
import os



def open_url(url):
    req = urllib.request.Request(url)
    req.add_header('User-Agent','Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36')
    page = urllib.request.urlopen(req)
    html = page.read().decode('utf-8')

    return html


def get_image(url):
    p = r'<img class="BDE_Image".*？src="[^"]*\.jpg".*?>'
    imagelist = re.findall(p, html)
    try:
        os.mkdir("NewPics")
    except FileExistsError:
        pass
    os.chdir("NewPics")
   
   
    '''
    for each in imagelist:
        print(each)
    '''
    for each in imagelist:
        filename = each.split("/")[-1]
        urllib.request.urlretrieve(each, filename, None)

        
if __name__ == '__main__':
    url = "https://tieba.baidu.com/p/6426975446"
    get_image(open_url(url))
   
   
  提示以下错误：      
Traceback (most recent call last):
  File "C:\Users\huahua\Desktop\python\download_p.py", line 37, in <module>
    get_image(open_url(url))
  File "C:\Users\huahua\Desktop\python\download_p.py", line 18, in get_image
    imagelist = re.findall(p, html)
NameError: name 'html' is not defined

wp231957

为什么不贴错误信息呢

zltzlt

这样试试：

1. import urllib.request
   
2. import re
   
3. import os
   
4. 
   
5. 
   
6. def open_url(url):
   
7.     req = urllib.request.Request(url)
   
8.     req.add_header('User-Agent',
   
9.                    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 '
   
10.                    '(KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36')
    
11.     page = urllib.request.urlopen(req)
    
12.     html = page.read().decode('utf-8')
    
13. 
    
14.     return html
    
15. 
    
16. 
    
17. def get_image(html):
    
18.     p = r'<img class="BDE_Image".*？src="[^"]*\.jpg".*?>'
    
19.     imagelist = re.findall(p, html)
    
20.     try:
    
21.         os.mkdir("NewPics")
    
22.     except FileExistsError:
    
23.         pass
    
24.     os.chdir("NewPics")
    
25. 
    
26.     for each in imagelist:
    
27.         filename = each.split("/")[-1]
    
28.         urllib.request.urlretrieve(each, filename, None)
    
29. 
    
30. 
    
31. if __name__ == '__main__':
    
32.     url = "https://tieba.baidu.com/p/6426975446"
    
33.     get_image(open_url(url))

复制代码