Use cases for del

[Daniel Dittmar]

Scott David Daniels wrote:
> Testing for None should be an is-test (not just for speed). In
> older pythons the == result wasn't necessarily same as is-test.
> This made sense to me after figuring out NULL in database stuff.

NULL in SQL databases has nothing to do with Python None. I'm quite sure 
that None == None always returned boolean true.

In a SQL database, NULL = NULL will always return NULL, which is prety 
much the same as FALSE. Except for NOT, AS NOT NULL is NULL.

Daniel