Place order on IB TWS

def placeOrder(self, contract, order, orderId=None, account=None):
        """ Place order on IB TWS """

        # get latest order id before submitting an order
        self.requestOrderIds()

        # continue...
        useOrderId = self.orderId if orderId == None else orderId
        if account:
            order.m_account = account
        self.ibConn.placeOrder(useOrderId, contract, order)

        account_key = order.m_account
        self.orders[useOrderId] = {
            "id":       useOrderId,
            "symbol":   self.contractString(contract),
            "contract": contract,
            "status":   "SENT",
            "reason":   None,
            "avgFillPrice": 0.,
            "parentId": 0,
            "time": datetime.fromtimestamp(int(self.time)),
            "account": None
        }
        if hasattr(order, "m_account"):
            self.orders[useOrderId]["account"] = order.m_account

        # return order id
        return useOrderId