metaclass decorator Python 2/3

metaclass_decorator.py

from __future__ import print_function, unicode_literals


def metaclass(meta):

    def metaclass_decorator(cls):
        dct = cls.__dict__.copy()
        slots = dct.get('__slots__')
        if slots is not None:
            if not isinstance(slots, (list, tuple)):
                slots = [slots]
            for slots_var in slots:
                dct.pop(slots_var, None)
        dct.pop('__dict__', None)
        dct.pop('__weakref__', None)
        if hasattr(cls, '__qualname__'):
            dct['__qualname__'] = cls.__qualname__
        cls_with_meta = meta(cls.__name__, cls.__bases__, dct)
        return cls_with_meta

    return metaclass_decorator


class Meta(type):

    def __new__(meta, name, bases, dct):
        print(name, bases, dct)
        return super(Meta, meta).__new__(meta, name, bases, dct)


@metaclass(Meta)
class Class(object):

    __slots__ = 'foo'