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This is an issue with the pictured hello world code (bottom left).
Actually, here is the shortest MWE:
import matplotlib
import matplotlib.pyplot as plt
import pybacktest
import pandas as pd
short_ma = 50
long_ma = 200
ohlc = pybacktest.load_from_yahoo('AAPL', start=2000)
ohlc.tail()
ms = ohlc.C.rolling(short_ma).mean()
ml = ohlc.C.rolling(long_ma).mean()
buy = cover = (ms > ml) & (ms.shift() < ml.shift()) # ma cross up
sell = short = (ms < ml) & (ms.shift() > ml.shift()) # ma cross down
bt = pybacktest.Backtest(locals(), 'ma_cross')
print(bt.summary())
matplotlib.rcParams['figure.figsize'] = (15.0, 8.0)
bt.plot_equity()
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