None, False, True

[M-a-S]

Can anybody explain this:

Python 2.3 (#46, Jul 29 2003, 18:54:32) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> None = 3
<stdin>:1: SyntaxWarning: assignment to None
>>> False = 4
>>> True = 5
>>>
>>> None, False, True
(3, 4, 5)
>>>