Simple way to backtest a strategy in Python with Backtrader

import backtrader as bt
import backtrader.analyzers as btanalyzers
import matplotlib
from datetime import datetime

class MaCrossStrategy(bt.Strategy):

    def __init__(self):
        ma_fast = bt.ind.SMA(period = 10)
        ma_slow = bt.ind.SMA(period = 50)
        
        self.crossover = bt.ind.CrossOver(ma_fast, ma_slow)

    def next(self):
        if not self.position:
            if self.crossover > 0: 
                self.buy()
        elif self.crossover < 0: 
            self.close()

cerebro = bt.Cerebro()

data = bt.feeds.YahooFinanceData(dataname = 'AAPL', fromdate = datetime(2010, 1, 1), todate = datetime(2020, 1, 1))
cerebro.adddata(data)

cerebro.addstrategy(MaCrossStrategy)

cerebro.broker.setcash(1000000.0)

cerebro.addsizer(bt.sizers.PercentSizer, percents = 10)

cerebro.addanalyzer(btanalyzers.SharpeRatio, _name = "sharpe")
cerebro.addanalyzer(btanalyzers.Transactions, _name = "trans")
cerebro.addanalyzer(btanalyzers.TradeAnalyzer, _name = "trades")

back = cerebro.run()

cerebro.broker.getvalue()

back[0].analyzers.sharpe.get_analysis()

back[0].analyzers.trans.get_analysis()

back[0].analyzers.trades.get_analysis()

cerebro.plot()