Python实现下载进度

# encoding:utf-8
import urllib
import os


def Schedule(a,b,c):
    '''''
    a:已经下载的数据块
    b:数据块的大小
    c:远程文件的大小
   '''
    per = 100.0 * a * b / c
    if per > 100 :
        per = 100
    print '%.2f%%' % per


def dowlonad():
    url = 'http://www.python.org/ftp/python/2.7.5/Python-2.7.5.tar.bz2'
    local = os.path.join('E:/xiaol/T/', 'Python-2.7.5.tar.bz2')
    urllib.urlretrieve(url, local, Schedule)


if __name__ == '__main__':
    dowlonad()