下載8000首兒歌的python的代碼：

代碼如下:
#-*- 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+"http://"+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)