def login(self, broker_name, account_cookie, account=None):
        """login 登录到交易前置

        2018-07-02 在实盘中,登录到交易前置后,需要同步资产状态

        Arguments:
            broker_name {[type]} -- [description]
            account_cookie {[type]} -- [description]

        Keyword Arguments:
            account {[type]} -- [description] (default: {None})

        Returns:
            [type] -- [description]
        """
        res = False
        if account is None:
            if account_cookie not in self.session.keys():
                self.session[account_cookie] = QA_Account(
                    account_cookie=account_cookie,
                    broker=broker_name
                )
                if self.sync_account(broker_name, account_cookie):
                    res = True

                if self.if_start_orderthreading and res:
                    #
                    self.order_handler.subscribe(
                        self.session[account_cookie],
                        self.broker[broker_name]
                    )

        else:
            if account_cookie not in self.session.keys():
                account.broker = broker_name
                self.session[account_cookie] = account
                if self.sync_account(broker_name, account_cookie):
                    res = True
                if self.if_start_orderthreading and res:
                    #
                    self.order_handler.subscribe(
                        account,
                        self.broker[broker_name]
                    )

        if res:
            return res
        else:
            try:
                self.session.pop(account_cookie)
            except:
                pass
            return False