why () is () and [] is [] work in other way?

[Rotwang]

On 21/04/2012 01:01, Roy Smith wrote:
> In article<877gxajit0.fsf at dpt-info.u-strasbg.fr>,
>   Alain Ketterlin<alain at dpt-info.u-strasbg.fr>  wrote:
>
>> Tuples are immutable, while lists are not.
>
> If you really want to have fun, consider this classic paradox:
>
>>>> [] is []
> False
>>>> id([]) == id([])
> True

Huh. This is not what I would have expected. What gives?

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