Kada的学习生活

#! /usr/bin/env python
# -*- coding: utf-8 -*-
#filename: download.py
import urllib
import sys

def download(url, filename):
    def reporthook(block_count, block_size, file_size):
        # 无法获得远程文件大小
        if file_size == -1:
            print "已下载", block_count*block_size, 'Byte'
        # 实时显示现在进度
        else:
            percentage = int((block_count*block_size*100) / file_size)
            if percentage > 100:
                print '100%'
            else:
                print '下载进度%d%%' % (percentage)

    filehandler, m = \
                urllib.urlretrieve(url, filename, reporthook=reporthook)
    print '下载完成'

if __name__ == '__main__':
    if len(sys.argv) != 3:
        print '使用方法: %s url filename' % sys.argv[0]
    else:
        download(sys.argv[1], sys.argv[2])