what exactly is "None" ?

[Erik Max Francis]

phil hunt wrote:

> None is equal to None. All values other than None are not equal t
> None.

Unfortunately, that's not quite true, since a custom class can override
__cmp__ or __eq__ to make it equal (==) to None.  The proper way to
check for None-ness is by identity (is).

It's true for all the builtin types, though.

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