Broker is left intact for optstrategy?

[duality_]

If I do cerebro.broker.getvalue() before and after a cerebro.run(), I get:

• No change in value (i.e. 10000) if using optstrategy.
• Change in value (e.g. 15000) if using addstrategy.

Is there an underlying reason for this? Is it to simplify things when using addstrategy?

[backtrader]

You are comparing apples and oranges. When optimizing, each Strategy run with its own broker instance.

[duality_]

Okay makes sense now. Kind of weird that you still can access a broker, that's not active at all, can be confusing.

[backtrader]

It would seem really confusing to access a broker after running, for example, an optimization run with 1000 different options and expect a broker instance, not connected to any of those 1000 options, to have a meaningful value.

[ismailbayram]

class CashAnalyzer(Analyzer):
    def __init__(self):
        super().__init__()
        self.start_cash = None
        self.end_cash = None

    def start(self):
        self.start_cash = self.strategy.broker.getvalue()

    def stop(self):
        self.end_cash = self.strategy.broker.getvalue()

    def get_analysis(self):
        return dict(start_cash=self.start_cash, end_cash=self.end_cash)