[Python-3000] None in Comparisons

[M.-A. Lemburg]

On 2008-11-11 15:22, Daniel Stutzbach wrote:
> On Tue, Nov 11, 2008 at 7:06 AM, M.-A. Lemburg <mal at egenix.com> wrote:
> 
>> Why was the special case for None being "smaller" than all other
>> objects in Python removed from Python 3.0 ? (see object.c in Py2.x)
>>
> 
> It wasn't true in Python 2.5, either.  Observe:
> 
> Cashew:~/pokersleuth/tracker$ python2.5
> Python 2.5 (r25:51908, Feb 26 2007, 08:19:26)
> [GCC 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)] on cygwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import datetime
>>>> now = datetime.datetime.now()
>>>> now < None
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> TypeError: can't compare datetime.datetime to NoneType

You're right, it's a bit unfortunate, that the special casing
is only applied as fall back mechanism in Python 2.x and that's
not always triggered when dealing with objects implementing
rich comparisons.

However, it does work for all the basic built-in types in Python,
such as strings, numbers, lists, tuples, dicts, etc.

-- 
Marc-Andre Lemburg
eGenix.com

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