How to inherit from Python None

Question

I would like to create a class that inherites from None.

Tried this:

class InvalidKeyNone(None):
    pass

but that giv

Answer 1

None is a constant, the sole value of types.NoneType (for v2.7, for v3.x)

Anyway, when you try to inherit from types.NoneType

from types import NoneType

class InvalidKeyNone(NoneType):
    pass

foo = InvalidKeyNone()
print(type(foo))

you'll get this error

Python 2

TypeError: Error when calling the metaclass bases type 'NoneType' is not an acceptable base type

Python 3

ImportError: cannot import name 'NoneType'

in short, you cannot inherit from NoneType

Anyway, why would want a class to inherit NoneType?