ExchangeRateCrawlerForPy2.py

#!/usr/bin/env python2.7
import urllib2 , io
from HTMLParser import HTMLParser
####################### SETTING ########################

bank_url = "http://rate.bot.com.tw/xrt?Lang=zh-TW"

####################### PAESER IMPLEMENT ###############

class rateParser(HTMLParser):
    def __init__(self):
        HTMLParser.__init__(self)
        self.getData = False
        self.getCurrencyName = True
        self.countRate = 0
        self.lastTag = ""
    def handle_starttag(self , tag , attrs):
        self.lastTag = tag
        if tag == "td":
            self.getData = True;
    def handle_data(self , data):
        if self.getData == True:
            if self.lastTag == 'td' and self.countRate < 4:
                if data.strip() != "":
                    print '%-7s\t' %data.strip() , " " ,
                    self.countRate += 1
            if self.lastTag == 'div' and self.getCurrencyName == True:
                if data.strip() != "":
                    print data.strip() , "\t" ,
                    self.getCurrencyName = False
    def handle_endtag(self , tag):
        if tag == 'td' and self.getData == True:
            self.getData = False
        if tag == 'tr':
            if self.getCurrencyName == False:
                print ""
            self.getCurrencyName = True
            self.countRate = 0

#######################    MAIN   ######################

if __name__ == '__main__':
    req = urllib2.Request(bank_url)#declear a http request
    req.add_header("User-Agent" , 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)')#pretend firefox
    response = urllib2.urlopen(req)#download html file
    web_page = response.read()#read html file
    rateParser().feed(web_page)#analysis html file

ExchangeRateCrawlerForPy3.py

#!/usr/bin/env python3
import io , urllib
from urllib.request import urlopen
from html.parser import HTMLParser
####################### SETTING ########################

bank_url = "http://rate.bot.com.tw/xrt?Lang=zh-TW"

####################### PAESER IMPLEMENT ###############

class rateParser(HTMLParser):
    def __init__(self):
        HTMLParser.__init__(self)
        self.getData = False
        self.getCurrencyName = True
        self.countRate = 0
        self.lastTag = ""
    def handle_starttag(self , tag , attrs):
        self.lastTag = tag
        if tag == "td":
            self.getData = True;
    def handle_data(self , data):
        if self.getData == True:
            if self.lastTag == 'td' and self.countRate < 4:
                if data.strip() != "":
                    print('{:7}\t '.format(data.strip()) , end='')
                    self.countRate += 1
            if self.lastTag == 'div' and self.getCurrencyName == True:
                if data.strip() != "":
                    print('{} \t '.format(data.strip()), end='')
                    self.getCurrencyName = False
    def handle_endtag(self , tag):
        if tag == 'td' and self.getData == True:
            self.getData = False
        if tag == 'tr':
            if self.getCurrencyName == False:
                print("")
            self.getCurrencyName = True
            self.countRate = 0

#######################    MAIN   ######################

if __name__ == '__main__':
    response = urlopen(bank_url)#download html file
    rateParser().feed((response.read().decode('utf-8')))