不实例化一个 class 的时候使用它的property

 class A:
     @property
     def name(self):
         return ""

 print(A.name)  # <property object at 0x10d54cf98>

 class B(type):
     @property
     def name(cls):
         return ""

 print(B.name)  # <property object at 0x10da69688>

 class C(metaclass=B): ...

 print(C.name)  #