如何使用urllib2在python中下载zip文件？

Question

两部分的问题。我正在尝试从互联网档案中下载多个已存档的Cory
Doctorow播客。我的iTunes提要中未包含的旧版本。我已经编写了脚本，但是下载的文件格式不正确。

问题1-如何更改以下载zip mp3文件？问题2-将变量传递到URL的更好方法是什么？

 # and the base url.

def dlfile(file_name,file_mode,base_url):
    from urllib2 import Request, urlopen, URLError, HTTPError

    #create the url and the request
    url = base_url + file_name + mid_url + file_name + end_url 
    req = Request(url)

    # Open the url
    try:
        f = urlopen(req)
        print "downloading " + url

        # Open our local file for writing
        local_file = open(file_name, "wb" + file_mode)
        #Write to our local file
        local_file.write(f.read())
        local_file.close()

    #handle errors
    except HTTPError, e:
        print "HTTP Error:",e.code , url
    except URLError, e:
        print "URL Error:",e.reason , url

# Set the range 
var_range = range(150,153)

# Iterate over image ranges
for index in var_range:

    base_url = 'http://www.archive.org/download/Cory_Doctorow_Podcast_'
    mid_url = '/Cory_Doctorow_Podcast_'
    end_url = '_64kb_mp3.zip'
    #create file name based on known pattern
    file_name =  str(index) 
    dlfile(file_name,"wb",base_url

该脚本是从这里改编的

Answer 1

这是我处理URL构建和下载的方式。我确保将文件命名为url的基本名称（后跟斜杠后的最后一位），并且我还使用该with子句来打开要写入的文件。这使用了一个很好的ContextManager，因为它将在该块退出时关闭该文件。另外，我使用模板来构建URL字符串。urlopen不需要请求对象，只需一个字符串。

import os
from urllib2 import urlopen, URLError, HTTPError


def dlfile(url):
    # Open the url
    try:
        f = urlopen(url)
        print "downloading " + url

        # Open our local file for writing
        with open(os.path.basename(url), "wb") as local_file:
            local_file.write(f.read())

    #handle errors
    except HTTPError, e:
        print "HTTP Error:", e.code, url
    except URLError, e:
        print "URL Error:", e.reason, url


def main():
    # Iterate over image ranges
    for index in range(150, 151):
        url = ("http://www.archive.org/download/"
               "Cory_Doctorow_Podcast_%d/"
               "Cory_Doctorow_Podcast_%d_64kb_mp3.zip" %
               (index, index))
        dlfile(url)

if __name__ == '__main__':
    main()