Accessing strategy instance variables after backtest run

[zhang-alvin]

I'd like to access some of the indicators that I'm supplying for a backtest so that I can make custom plots. Using the tutorial example for reference:

from backtesting import Backtest, Strategy
from backtesting.lib import crossover

from backtesting.test import SMA, GOOG

#build strategy object based on abstract class
class SmaCross(Strategy):
    n1 = 10
    n2 = 20

    def init(self):
        close = self.data.Close
        self.sma1 = self.I(SMA, close, self.n1)
        self.sma2 = self.I(SMA, close, self.n2)

    def next(self):
        if crossover(self.sma1, self.sma2):
            self.buy()
        elif crossover(self.sma2, self.sma1):
            self.sell()

bt = Backtest(GOOG, SmaCross,
              cash=10000, commission=.002,
              exclusive_orders=True)

output = bt.run()

I'd like to be able to access the SmaCross.sma1 and SmaCross.sma2 array after the backtests completes.
bt._strategy doesn't seem to be an instance of the strategy:

bt._strategy.sma1
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-6-9f7e77c45178> in <module>
----> 1 bt._strategy.sma1

AttributeError: type object 'SmaCross' has no attribute 'sma1'

Is there a simple way to access the indicators after the run? One workaround that can work is by making a copy of the indicators as class members (non-instance variables), but that seems messy. Any help would be greatly appreciated.

[kernc]

bt._strategy doesn't seem to be an instance of the strategy

Where'd you get bt._strategy? It's stats._strategy (stats = bt.run()).

[zhang-alvin]

Ah of course, silly me. And to be consistent with the above example, it'd be output._strategy.sma1. Thanks @kernc.