可以使用第三方模組poster，使用easy_install 安裝方法如下

easy_instll poster

會自動安裝poster模組，安裝成功後，可以看到在poster egg檔案在site package下

這裡注意，根據官方說法：Because this distribution was installed --multi-version, before we can import modules from this package, we need to 'import pkg_resources' and use 'require("poster")'. 

這是在試圖解除安裝poster時（easy_install -m poster）時才看到的提示

下面是示例程式碼：

# -*- coding: utf-8 -*-
import httplib,urllib,re,urllib2,sys
from pkg_resources import require
require("poster==0.8.1")


from poster.encode import multipart_encode  
from poster.streaminghttp import register_openers

def uploadFile():
    try:
        register_openers()  
        #    opener.add_handler(urllib2.HTTPCookieProcessor(cookielib.CookieJar())) 
        params = {'Filename': open("httpRequestTestFile.xls", "rb"), 
                  'addr': 'importTax'}  
        datagen, headers = multipart_encode(params)  
        request = urllib2.Request(url, datagen, headers)  
        result = urllib2.urlopen(request).read()  
        print result 
    except Exception, e:
        print e