class PersonMeta type def __new__ cls name bases dict cache init_cache

class PersonMeta(type):
    def __new__(cls, name, bases, dict):
        cache = init_cache()
        dict['cache'] = cache
        return super(PersonMeta, cls).__new__(name, bases, dict)

Traceback (most recent call last):
....
    return super(PersonMeta, cls).__new__(name, bases, dict)
TypeError: Error when calling the metaclass bases
    type.__new__(X): X is not a type object (str)
---------------------
return type.__new__(cls, name, bases, dict) работает, разумеется