I tried something simple:
bpy.types.Group.BBoxVertsList = [Vector((0,0,0))]*20
But it won’t be saved in blend file. I can create something like this
class Location(bpy.types.PropertyGroup):
loc = bpy.props.FloatVectorProperty(subtype = 'TRANSLATION')
bpy.utils.register_class(Location)
bpy.types.Group.BBoxVertsList = bpy.props.PointerProperty(type = Location)
But it dosen’t seem efficient to create loc property one by one by add() method.
I know obj.bounding_box has solved it somehow, it is float list, but user can call each element of bounding box[x], and get location of vertices. But I’m don’t know how it is done - getting vert location, from what it seems flat list of floats…