def barh(self, alpha=None, width=<NUM_LIT>, height=<NUM_LIT>, ax=None, **kwds):
chart = self.bar(alpha=alpha, width=width, height=height, **kwds)<EOL>enc = chart.encoding<EOL>enc["<STR_LIT:x>"], enc["<STR_LIT:y>"] = enc["<STR_LIT:y>"], enc["<STR_LIT:x>"]<EOL>if ax is not None:<EOL><INDENT>return ax + chart<EOL><DEDENT>return chart<EOL>
Horizontal bar plot for Series data

        >>> series.vgplot.barh()  # doctest: +SKIP

        Parameters
        ----------
        alpha : float, optional
            transparency level, 0 <= alpha <= 1
        width : int, optional
            the width of the plot in pixels
        height : int, optional
            the height of the plot in pixels
        ax: altair.Chart, optional
            chart to be overlayed with this vis (convinience method for `chart1 + chart2`)

        Returns
        -------
        chart : alt.Chart
            altair chart representation