This is nice specifically because of the way the author uses `exec`. Without meaning to be patronizing, there must be lots of people reading the thread who don'

This is nice specifically because of the way the author uses `exec`. Without meaning to be patronizing, there must be lots of people reading the thread who don't know what `exec` does, and why it's a neat solution to this problem (or non-problem, whatever your view is); I'd say do look it up if you're interested in programming.