class Student(object):    __slots__ = ('name', 'age') # 用tuple定义允许绑定的属性名称

>>> s = Student() # 创建新的实例>>> s.name = 'Michael' # 绑定属性'name' >>> s.age = 25 # 绑定属性'age' >>> s.score = 99 # 绑定属性'score' Traceback (most recent call last): File "
    
     ", line 1, in 
     
       AttributeError: 'Student' object has no attribute 'score'