ABCMeta 没有给我一个例外

Question

ABCMeta assures that the constructor gives an exception if you try to instantiate the abstract class, then why doesn't it give me an exception in the console if I run this code?

from abc import ABCMeta

class MyClass(metaclass=ABCMeta):
    pass

x = MyClass()

Answer 1

From the docs ( https://docs.python.org/3/library/abc.html#abc.ABCMeta ):

A class that has a metaclass derived from ABCMeta cannot be instantiated unless all of its abstract methods and properties are overridden

As you have no abstract methods or properties in MyClass , it can be instantiated.