Parse HTML In Python

djstava

                                The module HTMLParser defines a class HTMLParser
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which serves as the basis for
parsing text files formatted in HTML (HyperText Mark-up Language) and XHTML.
Now as an example,we grab the chinese ubuntu forum
[url=http://forum.ubuntu.org.cn/index.php]http://forum.ubuntu.org.cn/index.php
web site.It can parse the data between the tag 'table/tr/td/a' and 'table/tr/td/font'.
#!/usr/bin/env python

import sys
import urllib
import HTMLParser
class CustomParser(HTMLParser.HTMLParser):
    selected = ('table', 'font', 'tr', 'td', 'a')
    def reset(self):
        HTMLParser.HTMLParser.reset(self)
        self._level_stack = []
    def handle_starttag(self, tag, attrs):
        if tag in CustomParser.selected:
            self._level_stack.append(tag)
    def handle_endtag(self, tag):
        if self._level_stack \
        and tag in CustomParser.selected \
        and tag == self._level_stack[-1]:
            self._level_stack.pop()
    def handle_data(self, data):
        if "/".join(self._level_stack) in (
            'table/tr/td/a',
            'table/tr/td/font'):
            print data
if __name__ == "__main__":
    content = urllib.urlopen('http://forum.ubuntu.org.cn/index.php').read()
    #print content
    parser = CustomParser()
    parser.feed(content)
    parser.close()
Note:
subClass cannot override HTMLParser __init__ method,it may show "instance has no attribute 'rawdata'" error message,and also cannot deliver data from outside.You could use the global variable,but it is not recommended.
               
               
               
               

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u3/93196/showart_2155081.html