from backtesting import Strategy
from backtesting.lib import crossover

class SMAcross(Strategy):
    n1 = 50
    n2 = 100

    def __init__(self):
        close = self.data.Close
        self.sma1 = self.I(ta.trend.sma_indicator, pd.Series(close), self.n1)
        self.sma2 = self.I(ta.trend.sma_indicator, pd.Series(close), self.n2)

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