n has been performed</dd>
</dl></div>
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">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 operation has been performed
    