I've only once used metaclasses but I think it was pretty nifty. The use case was with Python and Gtk+ (both version 2), if you had your UI in a glade file you

I've only once used metaclasses but I think it was pretty nifty. The use case was with Python and Gtk+ (both version 2), if you had your UI in a glade file you could define a corresponding class, and it would automatically create members for all your named widgets. It made it a bit like coding in VB: class MainWindow(gtk.Window): __metaclass__ = MetaDescribedUI("MainWindow.ui") def __init__(self): # now you can use e.g. self.lvFiles or self.btnOK pass Although writing it now I could probably do it differently without metaclasses.