def mode(self, dropna=True):
<EOL>return algorithms.mode(self, dropna=dropna)<EOL>
Return the mode(s) of the dataset.

Always returns Series even if only one value is returned.

Parameters
----------
dropna : bool, default True
    Don't consider counts of NaN/NaT.

    .. versionadded:: 0.24.0

Returns
-------
Series
    Modes of the Series in sorted order.