class Test(object):

    __slots__ = ("name","age")

t = Test()

t.name = "老王"

t.age = 18

print(t.name)

print(t.age)

#__slots__用来控制类可以动态添加的属性

t.addr = "山东"

老王 18

Traceback (most recent call last):

  File "E:/python_code2019/day1/40-__slots__.py", line 13, in <module>

    t.addr = "山东"

AttributeError: 'Test' object has no attribute 'addr'