None, False, True

[Skip Montanaro]

    >> If I remember it right, None is going to be promoted into keywords
    >> soon. Therefore the warning.

    M-a-S> Will it be lower-case (together with false and true) like all
    M-a-S> other keywords or is it just a start of mess?

Python is a case-sensitive language. Variables named "none" and "None" are
different.  It's unlikely that Python's case-sensitive properties will
change, so the SyntaxWarning will only be raised for "None".

Skip