metaclass exampleclass OrderedClass(type): #該方法返回值就是__new__的namespace參數，如果沒有該方法namespace的值就是dict() @classmethod def __PRepare__(metacls, name, bases, **kwds): return collections.OrderedDict() #namespace就是class的__dict__,這個dict類型的對象已經被填充了相應的值 def __new__(cls, name, bases, namespace, **kwds): result = type.__new__(cls, name, bases, dict(namespace)) result.members = tuple(namespace) return resultclass A(metaclass=OrderedClass): def one(self): pass def two(self): pass def three(self): pass def four(self): passprint(A.members)#('__module__', '__qualname__', 'one', 'two', 'three', 'four')
