__slots__用法

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"

　　输出

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'