[Python-Dev] Got None. Maybe Some?

[Guido van Rossum]

> Is None so weird?  All I am proposing is a symmetric value to None. 
> Just like there is a -1 and 1, -Infinity and Infinity, None logically
> should have Some.  Maybe not so much -Some == None, but as I propose in
> the PEP, possibly Some == not None.

None's purposr is not to be less than all numbers (in fact in
the past it wasn't); it's to be "not any object", like nil or NULL in
other languages.

I don't see a similar broad role for Some.

And I repeat my question: which other language has that concept?

--Guido van Rossum (home page: http://www.python.org/~guido/)