自己动手用python写一个下载器

落日映苍穹つ 2022-05-24 23:51 570阅读 0赞

今天用chrome下载[ubuntu系统iso][ubuntu_iso]的时候非常慢（事实上用chrome下载什么都经常异常的慢），但是又没有安装迅雷（也不想），于是打算自己用python写一个下载器。  
代码很简单，没有断点续传，没有文件校验，更没有p2p，就一个下载的功能；

# coding: utf-8
    import urllib
    
    url = 'http://releases.ubuntu.com/18.04/ubuntu-18.04-desktop-amd64.iso'
    
    filename = url[url.rindex('/'):]
    print('filename = ' + filename)
    
    downloaded = '0'
    
    
    def download_listener(a, b, c):
        per = 100.0 * a * b / c
        if per > 100:
            per = 100
        new_downloaded = '%.1f' % per
        global downloaded
        if new_downloaded != downloaded:
            downloaded = new_downloaded
            print 'download %s%%  %s/%s' % (downloaded, a * b, c)
    
    
    response = urllib.urlretrieve(url, 'D:\\download\\' + filename, download_listener)

因为技术含量极低，所以不得不说，python大法真好……

**更新**  
python3版本

# coding: utf-8
    import urllib.request
    import os
    
    url = 'https://nchc.dl.sourceforge.net/Setup.exe'  # 下载地址
    
    filename = url[url.rindex('/') + 1:]  # 截取文件名
    print('filename = ' + filename)
    
    downloaded = '0'
    
    
    def download_listener(a, b, c):
        per = 100.0 * a * b / c
        if per > 100:
            per = 100
        new_downloaded = '%.1f' % per
        global downloaded
        if new_downloaded != downloaded:
            downloaded = new_downloaded
            print('download %s%% %s/%s' % (downloaded, a * b, c))
    
    
    path = 'D:\\download\\'  # 下载目录
    if not os.path.exists(path):
        os.mkdir(path)
    
    response = urllib.request.urlretrieve(url, path + filename, download_listener)

[ubuntu_iso]: https://www.ubuntu.com/download/desktop/thank-you?country=CN&version=18.04&architecture=amd64