default arguments newbie question

[Aahz Maruch]

In article <3A5CD60D.98CFAD33 at alcyone.com>,
Erik Max Francis  <max at alcyone.com> wrote:
>Aahz Maruch wrote:
>
>> Yup.  Technically, you really want to write "if l is None", though; if
>> you don't actually care about it being precisely None, the common
>> idiom
>> is to write "if l".
>
>Eh?  I don't see that.  Any value which is not None will compare unequal
>to None, correct?  Certainly this true for the fundamental types like
>strings, numbers, tuples, and lists:

You must have missed the post recently where someone showed a class that
compared equal to None.
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