python __slots__ 限制属性

class Student(object):
    pass
    
s = Student()

s.name = "LiLei"

print(s.name)

>>> LiLei

class Teacher(object):
    # 用tuple定义允许绑定的属性名称，但是此限制对子类不起作用
    __slots__ = ('name', 'age') 

t = Teacher()

# 此处不能再添加属性
t.height = 1

>>> AttributeError: 'Teacher' object has no attribute 'height'

class MiddleTeacher(object):
    pass

s = MiddleTeacher()

s.height = 1

print(s.height)

>>> 1