default arguments newbie question

[Erik Max Francis]

Mike Fletcher wrote:

> To expand on that "fundamental types" qualification...
> 
> class NULL:
>     def __cmp__( self, other ):
>         if other:
>            return -1
>         else:
>            return 0
> 
> Will break the assumption that x == None means x is None.  That is,
> NULLs
> will equate to any "false" value, including None, but would not match
> with
> an "is" test.

Well, sure, you can come up with pathological cases, but as you say, it
isn't terribly important as a serious technical objection.

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