Following Sentdex tutorial in Youtube Multiple Windows/Frames in Tkinter GUI with Python - Tkinter tutorial Python 3.4 p. 4, you have to hardcode a line each time you create a new class that's a page.
df['HL_PCT'] = (df['Adj. High'] - df['Adj. Low']) / df['Adj. Close'] * 100.0 df['PCT_change'] = (df['Adj. Close'] - df['Adj. Open']) / df['Adj. Open'] * 100.0 df = df ...
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