Nested List Comprehension

[Alex]

> > Yeah, I mucked around a bit with nested list comprehensions when I
> > started using them.  It causes the same sort of miserable readability
> > problems that excessive use of the functional programming facilities
> > do.

> I think LC's are pretty neat, not that that's likely to sway anyone's
> opinion one way or the other. Like many techniques it can be abused by
> overuse.

Oops, yeah, I meant using them gratuitously can cause problems

Alex.