Center of the bounding box around all data present in the scene

def center(self):
        """Center of the bounding box around all data present in the scene"""
        bounds = self.bounds
        x = (bounds[1] + bounds[0])/2
        y = (bounds[3] + bounds[2])/2
        z = (bounds[5] + bounds[4])/2
        return [x, y, z]