新手求问

qsnqss

1. import httplib
   
2. from sgmllib import SGMLParser
   
3. 
   
4. class HTMLParser(SGMLParser):
   
5.     self.urls = []
   
6.     def start_a(self, attrs):
   
7.         href = [v for k, v in attrs if k == 'href']
   
8.         if href:
   
9.             self.urls.extend(href)
   
10.     def show():
    
11.         print self.urls
    
12. 
    
13. jhconn = httplib.HTTPConnection("www.chinaunix.net")
    
14. jhconn.request("GET", "/jh/")
    
15. jhresponse = kqconn.getresponse()
    
16. 
    
17. print jhresponse.read()
    
18. 
    
19. htmlparser = HTMLParser()
    
20. htmlparser.feed(jhresponse.read())

复制代码

执行的时候提示：
    self.urls = []
NameError: name 'self' is not defined

是怎么回事呢?

feillex

1. 
   
2. class HTMLParser(SGMLParser):
   
3. 
   
4.     def __init__(self):
   
5.         super(HTMLParser,self).__init__()
   
6.         self.urls = []
   
7. 
   
8.     def start_a(self, attrs):
   
9. 
   
10.         href = [v for k, v in attrs if k == 'href']
    
11. 
    
12.         if href:
    
13. 
    
14.             self.urls.extend(href)
    
15. 
    
16.     def show():
    
17. 
    
18.         print self.urls
    
19. 
    

复制代码

a515200

那不明明显示着吗？？self参数没有被定义。仔细看下代码出错的原因

len(py)

def show():

        print self.urls


def show(self):

        print self.urls