def _axis_properties(self, axis, title_size, title_offset, label_angle,
                         label_align, color):
        """Assign axis properties"""
        if self.axes:
            axis = [a for a in self.axes if a.scale is axis][0]
            self._set_axis_properties(axis)
            self._set_all_axis_color(axis, color)

            if title_size:
                axis.properties.title.font_size = ValueRef(value=title_size)
            if label_angle:
                axis.properties.labels.angle = ValueRef(value=label_angle)
            if label_align:
                axis.properties.labels.align = ValueRef(value=label_align)
            if title_offset:
                axis.properties.title.dy = ValueRef(value=title_offset)
        else:
            raise ValueError('This Visualization has no axes!')
dataset/ETHPy150Open wrobstory/vincent/vincent/visualization.py/Visualization._axis_properties/operator `==` -> `is`