gistfile1.txt

class KivyFactoryMetaClass(type):  

    def __new__(cls, name, bases, attrs):  
        #replacement for original __init__ function
        original_init = attrs.get('__init__', bases[0].__init__)
        def alternate_init(self,*args,**kwargs):  
            original_init(self,*args,**kwargs)  
            if name == self.__class__.__name__: #dont call base setup again
                self.setup(**kwargs)  
        
        attrs['__init__'] = alternate_init 
        return super(KivyFactoryMetaClass, cls).__new__(cls, name, bases, attrs)

    def __init__(self, name, bases, attrs):  
        super(KivyFactoryMetaClass, self).__init__(name, bases, attrs)
        Factory.register(name, self)
        print "Registered %s in Widget Factory" % name