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Download the latest version of Calibre for all platforms

It is also downloading in parallel.
#!/usr/bin/env python2.7

import HTMLParser
import urllib2
from contextlib import closing
import shutil
import urlparse
import os.path
import threading

class CalibreVersionParser(HTMLParser.HTMLParser):
    __in_href = False
    __version = ''

    def handle_starttag(self, tag, attrs):
        if tag == 'a':
            for k, v in attrs:
                if k == 'title' and v.startswith('Release'):
                    self.__in_href = True
                    break
    def handle_data(self, data):
        if self.__in_href:
            if not self.__version:
                self.__version = data.strip()
    def handle_endtag(self, tag):
        if tag == 'a':
            self.__in_href = False

    def getversion(self):
        return self.__version

def download(url, filename):
    with closing(urllib2.urlopen(url)) as resp:
        with open(filename, 'wb') as w:
            shutil.copyfileobj(resp, w, 102400)


resp = urllib2.urlopen('http://download.calibre-ebook.com/2.html')

parser = CalibreVersionParser()
parser.feed(resp.read())

calibreVer = parser.getversion()

if not calibreVer:
    raise SystemExit("Can not get calibre version")

downroot = 'http://download.calibre-ebook.com/{0}/calibre-'.format(calibreVer)

downlist = [
        '{0}{1}.dmg'.format(downroot, calibreVer), 
        '{0}{1}-x86_64.txz'.format(downroot, calibreVer), 
        '{0}64bit-{1}.msi'.format(downroot, calibreVer)
        ]

t = [ threading.Thread(
            target=download, 
            args=(d, os.path.basename(urlparse.urlparse(d).path))) 
        for d in downlist ]

for w in t: w.start()
for w in t: w.join()
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