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13 pd.isna(cell_value) can be used to check if a given cell value is nan. Alternatively, pd.notna(cell_value) to check the opposite. From source code of pandas:

Aug 29, 2018 · Pandas has both isna() and isnull(). I usually use isnull() to detect missing values and have never met the case so that I had to use other than that. So, when to use isna()?

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