metaclass repr puzzle

shell session

$ cat base.py
class MyMeta(type):
    def __new__(mcs, name, bases, attrs):
        return super().__new__(mcs, name, bases, attrs)


class MyBase(metaclass=MyMeta):
    pass
    
$ python -c 'from base import MyBase
class A(MyBase): pass
B = type("B", (MyBase,), {})
print(repr(A))
print(repr(B))'
<class '__main__.A'>
<class 'base.B'>