Read/write boolean value specifying whether to use a different color
        for each of the points in this plot. Only effective when there is
        a single series; PowerPoint automatically varies color by series when
        more than one series is present.

def vary_by_categories(self):
        """
        Read/write boolean value specifying whether to use a different color
        for each of the points in this plot. Only effective when there is
        a single series; PowerPoint automatically varies color by series when
        more than one series is present.
        """
        varyColors = self._element.varyColors
        if varyColors is None:
            return True
        return varyColors.val