N&#39;].value_counts()
    stillNeededDF.to_csv(outdir+&#39;Undefined_&#39;+todayDateStr+&#39;.csv&#39;)
    return stillNeededDF

#Fill in unclassified rows&#39; flags with 0
def fill_unclassified(df, classification_col=&#39;CLASS_FLAG&#39;):
    &#34;&#34;&#34;Fills unclassified rows in &#39;CLASS_FLAG&#39; column with np.nan

    Parameters
    ----------
    df : pandas.DataFrame
        Dataframe on which to perform operation

    Returns
    -------
    df : pandas.DataFrame
        Dataframe on which