python实现保存网页到本地示例

#coding=utf-8
__auther__ = 'xianbao'
import urllib
import os
def reporthook(blocks_read, block_size, total_size):
 if not blocks_read:
  print '打开连接'
  return
 if total_size < 0:
  print "%d正在读取(%dbytes完成)"%(blocks_read, blocks_read * block_size)
 else:
  amout_read = block_size * blocks_read
  print '%d正在读取，%d/%d'%(blocks_read, amout_read, total_size)
 return

try:
 filename, msg = urllib.urlretrieve('http://www.jb51.net/', reporthook=reporthook)
 print
 print '文件是：', filename
 print '头文件是'
 print msg
 print '删除前的文件地址：', os.path.exists(filename)

finally:
 urllib.urlcleanup()

 print '文件依然存在：', os.path.exists(filename)