Backtrader python client library Bracket orders limit is not working

[Sunny P]

Hello All,
I am using Backtrader the testing framework for the stocks strategy

I want to test my strategy for stock order placing, I want to place long(buy) order so for that I will use the bracket_order method in which I will set a limit

1. at which price I want to buy the stock
2. at which price I want to sell the stock after buy order limit is placed
3. at which price I want to stop loss if buy order is placed and stock price is decreasing

here is the code

cerebro = bt.Cerebro()
cerebro.addstrategy(MyStrategyWrapper)
cerebro.adddata(data=historical_stock_data_for_the_day)
cerebro.broker.setcash(1000)
cerebro.run()

this is the code in which I add my strategy class and the data historical_stock_data_for_the_day for the stock
the format for the historical_stock_data_for_the_day will be like
[{2389839283: 120}, {2389839211: 130}, ....... n]
where the numbers like 2389839283 is the timestamp at which the stock price is 120

when I call the cerebro.run() it will call my strategy class's method def next
for the each dict in list

my strategy class is

class MyStrategyWrapper(bt.Strategy):
    params = ()

    def __init__(self, *args, **kwargs):
        self.is_ordered = None


    def next(self) -> None:
        """This is the first method which is executed on cerebro.run() method"""
        now = self.datas[0].datetime.datetime(0)
        last_price = self.datas[0].close[0]
        if self.is_ordered:
            print("last price ", last_price)
            # after placing an order here i get the last price (77.91) at which i set the limit to buy asset more than 10 times 
            # that means after placing the order the stock reach that price
            return

        # ...
        # My some logic if it fullfill all conditions i want to place an bracket order
        # ...

        time_before = None
        if large_enough_5_min:
            time_before = True

        if time_before:
            brackets = self.buy_bracket(limitprice=78.99, price=77.91, stopprice=77.37, size=1, exectype = bt.Order.Limit)
            # (When i place the order from here limit is not reaching and order is buying stock at 77.62 instead of 77.91)
            self.is_ordered = True

    def notify_order(self, order):
        """callback when order is sent and any order related update"""
        if order.status in (order.Canceled, order.Margin, order.Rejected):
            return

        if order.status in (order.Submitted, order.Accepted):
            return

        if order.status in (order.Completed,):
            order_type = "long"
            print("Order is placed at the given limit")
            

    def notify_trade(self, trade):
        """callback when full trade is completed"""
        if not trade.isclosed:
            return
        print("Trade is completed")

i tried by changing the limit and checked on the official docs https://www.backtrader.com/docu/order-creation-execution/bracket/bracket/

to place a bracket order, also checked by placing manually order but facing issue with the limit.

please let me know if I missed something or doing wrong in this code

Thank you

[BorutF]

@sunny-p You said it buys at 77.62 instead of 77.91, that is correct as when you have a buy limit order you specify the worst(maximum) possible price you would want to buy at.

[Sunny P]

@borutf Thanks for replying but if sent an order with a limit if the order does not reach the limit I don't want to place an order

[BorutF]

@sunny-p for buy a limit order limits the price upwards.

you can do an Order.Stop that will be triggered at the price, however it will behave like a market order after that.