python实现twitter client

公司的代理可以直接穿墙，自由访问Twitter、Facebook等网站，这两天研究了一下Twitter提供的API，用python写了一个twitter client，只实现了基本功能，查看自己的twitter消息，也可以不验证，查看public的twitter消息。其他功能实现类似。主要函数如下：
def fetch_with_proxy(proxy, username, password, url):
    proxy_handler = urllib2.ProxyHandler({"http" : proxy})
    opener = urllib2.build_opener(proxy_handler)
    urllib2.install_opener(opener)
    authheader = AddAuthorizationHeader(username, password)
    req = urllib2.Request(url)
    try:
        res = urllib2.urlopen(req)
    except IOError, e:
        if hasattr(e, 'code'):
            if e.code != 401:
                print e.code
            else:
                req.add_header("Authorization", authheader)
                res = urllib2.urlopen(req)
                data= simplejson.loads(res.read())
def AddAuthorizationHeader(username, password):
    if username and password:
        basic_auth = base64.encodestring('%s:%s' % (username, password))[:-1]
        return 'Basic %s' % basic_auth
def main(user):
    username='XXX@gmail.com'   #change to your username and password
    password='XXX'
    proxy='host:port'            &