def last(series, order_by=None):
    """
    Returns the last value of a series.

    Args:
        series (pandas.Series): column to summarize.

    Kwargs:
        order_by: a pandas.Series or list of series (can be symbolic) to order
            the input series by before summarization.
    """

    if order_by is not None:
        series = order_series_by(series, order_by)
    last_s = series.iloc[series.size - 1]
    return last_s
def last ( series , order_by = None ) : if order_by is not None : series = order_series_by ( series , order_by ) last_s = series . iloc [ series . size - 1 ] return last_s
Returns the last value of a series.

    Args:
        series (pandas.Series): column to summarize.

    Kwargs:
        order_by: a pandas.Series or list of series (can be symbolic) to order
            the input series by before summarization.