Python code sharing for downloading 8000 children's songs

Download the python code for 8000 children's songs:

#-*- coding: UTF-8 -*-
from pyquery import PyQuery as py

from lxml import etree

import urllib

import re

import os

import sys

import logging
def format(filename):

    tuple=(' ',''',''')

    for char in tuple:

        if (filename.find(char)!=-1):

            filename=filename.replace(char,"_")

    return filename
def download_mp3(mp3_url, filename,dir):       

    f = dir+"\"+filename

    if os.path.exists(f):

      logger.debug(f+" is existed.")

      return

      

    try:

        open(f, 'wb').write(urllib.urlopen(mp3_url).read())

        logger.debug(  filename + ' is downloaded.')

    except:

        logger.debug( filename + ' is not downloaded.')
        

def download_all_mp3(start,end,dir,logger):

  for x in range(start,end):

    try:

        url = "http://www.youban.com/mp3-d" + str(x) + ".html"

        logger.debug(str(x) + ": "+url)

        doc = py(url=url)

        e = doc('.mp3downloadbox')

        if e is None or e == '': 

          logger.debug(url+" is not existed.")

          return

          

        e = unicode(e)

        #logger.debug( e)

        regex = re.compile(ur".*<h1>(.*)</h1>.*downloadboxlist.*?<a.*?"(.*?)"",re.UNICODE|re.S)

        m = regex.search(e)

        if m is not None:

          title = m.group(1).strip()

          title2 = str(x)+"_"+title + ".mp3" 

          #title2 = re.sub(' ','_',title2)

          title2 = format(title2)

          link = m.group(2)

          #logger.debug( "title:" + title + " link:" + link)

          if link == '' or title == '':

            logger.debug(url + " is not useful")

            continue

          logger.debug(str(x)+": "+link)

          download_mp3(link,title2,dir)

    except:

        logger.debug(url+" met exception.")

        continue

     
      

if __name__ == "__main__":

    dir_root = "e:\song"

    if sys.argv[3] != '': dir_root=sys.argv[3]

    

    start,end = 1,8000

    if sys.argv[1] >= 0 and sys.argv[2]>=0:

      start,end = int(sys.argv[1]),int(sys.argv[2])

      print ("Download from %s to %s.n" % (start,end))      

    

    dir = dir_root + "\"+str(start)+"-"+str(end)

    if not os.path.exists(dir): 

      os.mkdir(dir)     

    print "Download to " + dir + ".n"

    

    logger = logging.getLogger("simple")

    logger.setLevel(logging.DEBUG)  

    fh = logging.FileHandler(dir+"\"+"download.log")

    ch = logging.StreamHandler()

    formatter = logging.Formatter("%(message)s")

    ch.setFormatter(formatter)

    fh.setFormatter(formatter) 

    logger.addHandler(ch)

    logger.addHandler(fh)

    download_all_mp3(start,end,dir,logger)

If necessary, you can refer to continue to modify.