python生成带参数二维码

#coding:utf8import urllib2import urllibimport jsonimport stringimport randomclass WebChat(object):    def __init__(self, appid=None, secret=None, code=None):        self.appid = appid        self.secret = secret        self.code = code    def token_url(self):        return "https://api.weixin.QQ.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s"                % (self.appid, self.secret)    def get_access_token(self):        access_token_url = self.token_url()        f = urllib2.urlopen(access_token_url)        json_string = f.read()        return json.loads(json_string)['access_token']    def get_ticket_url(self):        access_token = self.get_access_token()        url = "https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=%s" %(access_token)        return url    def get_ticket(self):    	body={                "action_name": "QR_LIMIT_SCENE",                 "action_info": {                "PRoduct_id":'d442kdD',                "scene": {                        "scene_id": 1444                        }                                }                }        jsons = json.dumps(body)        ticket_url = self.get_ticket_url()        ret = urllib2.Request(ticket_url,jsons)        result_string = urllib2.urlopen(ret).read()        return json.loads(result_string)['ticket']    def exchange_by_ticket(self):        ticket = self.get_ticket()        exchange_by_ticket_url = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=%s" % (ticket)        return exchange_by_ticket_url    def qrcode_name(self):	    allw = string.letters+string.digits	    r = []	    for i in range(6):	        r.append(random.choice(allw))	    return ''.join(r)     def get_qrcode_by_url(self):    	url = self.exchange_by_ticket()    	ret = urllib2.urlopen(url).read()    	name = self.qrcode_name()    	with open(name+'.jpg','wb') as f:    		f.write(ret)    		    	return 1if __name__ =='__main__':    web_chat = WebChat('XXXX','XXXX')    result = web_chat.get_qrcode_by_url()    print result