analyzers erro: AttributeError: 'list' object has no attribute 'analyzers'

[Evgeniy]

Hello! When studying this library, I ran into a problem.

I do everything on the lesson of trade analysis. But I get an error.

My cod:

cerebro = bt.Cerebro(stdstats=False)
    data = PandasData(dataname=df, timeframe=bt.TimeFrame.Minutes)
    cerebro.addanalyzer(TradeAnalyzer, _name="ta")

    cerebro.adddata(data)
    cerebro.optstrategy(Strategy)

    thestrats = cerebro.run()
    strat = thestrats[0]

    print(strat.analyzers.ta.get_analysis())

error:

print(strat.analyzers.ta.get_analysis())
AttributeError: 'list' object has no attribute 'analyzers'

What is the problem?

[vladisld]

IIRC if optstrategy is used, the 'run' method will return a list of lists. Quoting the docs ( 'Returning the results' section of the cerebro section https://www.backtrader.com/docu/cerebro/):

Returning the results

cerebro returns the instances of the strategies it created during backtesting. This allows to analyze what they did, because all elements in the strategies are accessible:

result = cerebro.run(**kwargs)

The format of result returned by run will vary depending on whether optimization is used (a strategy was added with optstrategy):

    **All strategies added with addstrategy**

    result will be a list of the instances run during the backtesting

    **1 or more strategies were added with optstrategy**

    result will be a list of list. Each internal list will contain the strategies after each optimization run
``

[Evgeniy]

@vladisld Thanks a lot!