Ready for first real test

state/sandbox/tmp8sqasehy/script.py

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+
+import numpy as np, pandas as pd, matplotlib.pyplot as plt
+import yfinance as yf
+df = yf.download("AAPL", period="3mo", progress=False)
+close = df["Close"].squeeze()   # handle yfinance multiindex
+print("AAPL last:", round(float(close.iloc[-1]),2), "| 20d SMA:", round(float(close.rolling(20).mean().iloc[-1]),2))
+close.plot(title="AAPL 3mo"); plt.savefig("aapl.png")