What values are considered false?

[Roy Smith]

Erik Max Francis <max at alcyone.com> wrote:
> Many languages (other than Scheme) have a loose definition of truth
> and falsity, simply because at times it's useful to be able to test
> any object for truth.

If you want a really odd concept of falsity, look at SQL.  NULL is neither 
true nor false!  Or, looking at it a different way, anything non-NULL is 
neither equal to, nor not equal to NULL.

This actually causes some strange interactions in the python SQL modules.  
You put '' into a database, and get None back.  They are both false, but 
they're not the same thing.

Anybody remember .TRUE. and .FALSE. :-)

PS -- In the lists of false things in python that have been mentioned on 
this thread, I don't think I've seen anybody mention {}, the empty 
dictionary.