Python 使用urllib2模块实现断点续传下载

#!/usr/bin/python
# -*- coding: UTF-8 -*
'''
Created on 2013-04-15
Created by RobinTang
A demo for Resuming Transfer
'''
import urllib2

req = urllib2.Request('http://www.python.org/')
req.add_header('Range', 'bytes=0-20') # set the range, from 0byte to 19byte, 20bytes len
res = urllib2.urlopen(req)

data = res.read()

print data
print '---------'
print 'len:%d'%len(data)