Metaclass of a metaclass

[Steven D'Aprano]

I was playing around with metaclasses and I wondered what would happen if
the metaclass itself had a metaclass. Sort of a metametaclass.

Apparently it gives an error. Can anyone explain why this does not work?

# Python 3.2


.... def __repr__(self):
.... s = super().__repr__()
.... return s.replace('class', 'metaclass')
........ pass
........ pass
....
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: object.__new__() takes no parameters



What am I doing wrong?

 

[bruno.desthuilliers]

Apparently it gives an error. Can anyone explain why this does not work?

# Python 3.2


...     def __repr__(self):
...             s = super().__repr__()
...             return s.replace('class', 'metaclass')


...     pass
(...)


...     pass
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: object.__new__() takes no parameters

What am I doing wrong?

Meta inherit from object, but being used as a metaclass, Meta.__new__
is called with name, bases, dict etc as arguments.