Some instance objects are themselves classes; and all classes are instances of a corresponding metaclass. Even classes only come into existence through the instantiation mechanism.
某些实例对象就是类本身，并且所有的类都是相应元类的实例，甚至类也只能通过实例化机制生成。
Some instance objects are themselves classes; and all classes are instances of a corresponding metaclass. Even classes only come into existence through the instantiation mechanism.
某些实例对象就是类本身，并且所有的类都是相应元类的实例，甚至类也只能通过实例化机制生成。
应用推荐