Ready for first real test

state/sandbox/tmps_0krww5/script.py

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+
+import yfinance as yf, matplotlib.pyplot as plt
+df = yf.download("AAPL", period="3mo", progress=False)
+df["SMA20"] = df["Close"].rolling(20).mean()
+print("rows", len(df), "last close", round(float(df["Close"].iloc[-1]),2))
+df[["Close","SMA20"]].plot(title="AAPL"); plt.savefig("aapl.png")