python client使用http post 到server端的代码

import urllib, httplib 
import utils 
import json
       class user: 

        def __init__(self): 
            print 'a' 

        def login(self, imsi, ua): 
            print "==============user start login==================" 
            input = { 
                "method"       : "user.login", 
                "username"     : "", 
                "userpass"     : "", 
            } 

            input["sig"] = utils.getsignature(input) 
            params = urllib.urlencode(input) 
            headers = { 
                "user-agent"  : ua, 
                "appstore-clienttype" : "android", 
                "appstore-imei" : "123456789000000", 
                "appstore-imsi" : imsi 
            } 

            try: 
                connection = httplib.httpconnection(utils.api_host) 
                connection.request("post", "/api", params, headers) 
                response = connection.getresponse().read() 
                #print "=========" + response 
                connection.close() 
            except exception, e : 
                print "========" + str(e)     

            if "errorcode" in response or response is none: 
                return 

            results = json.loads(response)     

            return results["results"].encode("utf-8")