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http://blog.chinaunix.net/u2/82009/showart_2166843.html
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#!/usr/bin/env python
# weather html parser
from HTMLParser import HTMLParser
import sys,urllib2,string,re
# define a class to parser a html
class HtmlParser(HTMLParser):
    def __init__(self):
        self.data=''
        self.readingdata=0
        HTMLParser.__init__(self)
    def handle_starttag(self,tag,attrs):
        if tag == 'td':
            self.readingdata=1
    def handle_data(self,chars):
        if self.readingdata:
            self.data+=chars
    def handle_endtag(self,tag):
        if tag=='td':
            self.readingdata=0
    def cleanse(self):
        self.data = re.sub('\s+',' ', self.data)
    def getdata(self):
        self.cleanse()
        return self.data
# this url is a place where you want to know the weather forecast
url="http://www.weather.com.cn/html/weather/101210501.shtml


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