Variations on a Theme

Come up with variations of your favorite toy problems.  The more obfuscated the better.

I'll start with a simple one:

def factorial(n): return reduce(lambda x,y: x*y, range(1,n
+1)) if n > 1 else 1

>>2
Writing Lisp in all caps is disrespectful and irreverent. Until you can take Lisp more seriously, I'm adding your posts to my /prog/ filter.