下载8000首儿歌的python的代码：
复制代码 代码如下:
#-*- 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+\\+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.*
(.*).*downloadboxlist.*?        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)
有需要的可以参考继续修改。