I always have a REPL open when I am hacking. iPython is a great replacement for the vanilla Python one, and Pry is great for Ruby. Being able to poke and prod

I always have a REPL open when I am hacking. iPython is a great replacement for the vanilla Python one, and Pry is great for Ruby. Being able to poke and prod at a system is priceless for debugging and introspection.