FutureWarning: The frame.append method is deprecated and will be removed from pandas in a future version. Use pandas.concat instead.
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Henry Ecker
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`s2 = pd.concat([s2, s1], ignore_index=True, sort=False)` like [this answer](https://stackoverflow.com/a/30557040/15497888) – Henry Ecker Mar 03 '22 at 03:34