#小练习 使用HTMLParser获取data时注意事项

from HTMLParser import HTMLParser
class myHTMLParser(HTMLParser):
    def __init__(self):
        HTMLParser.__init__(self)
        self.links=[]

    def handle_starttag(self,tag,attrs):
        if tag=='a':
            if len(attrs)==0:pass
            else:

                for variable,value in attrs:
                    if variable=='href':
                        self.links.append(value)
    def handle_data(self,data):
#        if data.strip():
#            print data.strip()
        print '-'*10
        print 'data:',data
        print '-'*10

if __name__=='__main__':
    html_code='''
    <a href="www.google.com"> goolge.com </a>
    <A Href="www.pythonclub.org">PythonClub </a>
    <A HREF='www.sina.com.cn'> sina </a>
    '''
    hp=myHTMLParser()
    hp.feed(html_code)
    hp.close()
##    print hp.links

由于 字符串的data中含有空格，如

<a href="www.google.com"> goolge.com </a>

中的google两端有空格，所以要进行strip处理，如代码中的注释，否则会将空格看作一个data，输出空格。

#coding:utf-8
from sgmllib import SGMLParser

class urlparser(SGMLParser):

    def reset(self):
        #添加判断标示，如果遇到<a>，则self.flog='a'
        self.flag=None
        #存放链接地址
        self.l=[]
        #存放
        self.v=[]
        self.d={}
        SGMLParser.reset(self)


    def start_a(self,attrs):
        self.flag='a'
        href=[v for k,v in attrs if k=='href']
        if href:
            self.l.extend(href)

    def handle_data(self,data):
        #只追加<a>标签后面的文本
        if self.flag=='a':
            self.v.append(data)

    #遇到</a>，则self.flog=None，以免读取 urls中的 NEW，\n添加至字典
    def end_a(self):
        self.flag=None

    def merge(self):
        for a,v in enumerate(self.l):
            for b,r in enumerate(self.v):
                if a==b:

                    self.d[r]=v

if __name__ == '__main__':
    urls='''
    <tr>
<td height="207" colspan="2" align="left" valign="top" class="normal">
<p>Damien Rice - 《0》 </p>
<a href="http://galeki.xy568.net/music/Delicate.mp3">1. Delicate</a><br />NEW
<a href="http://galeki.xy568.net/music/Volcano.mp3">2. Volcano</a><br />
<a href="http://galeki.xy568.net/music/The Blower's Daughter.mp3">3. The Blower's Daughter</a><br />
<a href="http://galeki.xy568.net/music/Cannonball.mp3">4. Cannonball </a><br />
<a href="http://galeki.xy568.net/music/Older Chests.mp3">5. Order Chests</a><br />
<a href="http://galeki.xy568.net/music/Amie.mp3">6. Amie</a><br />
<a href="http://galeki.xy568.net/music/Cheers Darlin'.mp3">7. Cheers Darling</a><br />
<a href="http://galeki.xy568.net/music/Cold Water.mp3">8. Cold water</a><br />
<a href="http://galeki.xy568.net/music/I Remember.mp3">9. I remember</a><br />
<a href="http://galeki.xy568.net/music/Eskimo.mp3">10. Eskimo</a></p>
</td>
</tr>
    '''
    upr=urlparser()
    upr.feed(urls)
##    for i in upr.l:
##        print i
    upr.merge()
    for item in upr.d.items():
        print item
    print len(upr.d)
    upr.close()

结果：

('4. Cannonball ', 'http://galeki.xy568.net/music/Cannonball.mp3')
('1. Delicate', 'http://galeki.xy568.net/music/Delicate.mp3')
('6. Amie', 'http://galeki.xy568.net/music/Amie.mp3')
('8. Cold water', 'http://galeki.xy568.net/music/Cold Water.mp3')
('10. Eskimo', 'http://galeki.xy568.net/music/Eskimo.mp3')
('9. I remember', 'http://galeki.xy568.net/music/I Remember.mp3')
('5. Order Chests', 'http://galeki.xy568.net/music/Older Chests.mp3')
("3. The Blower's Daughter", "http://galeki.xy568.net/music/The Blower's Daughter.mp3")
('2. Volcano', 'http://galeki.xy568.net/music/Volcano.mp3')
('7. Cheers Darling', "http://galeki.xy568.net/music/Cheers Darlin'.mp3")
10