I voted Python. I've used it with many frameworks (which one is the right one depends very much on what you're trying to do). Also some PHP in a very dark past. I like Python because it is so versatile, due to the large number of available packages and bindings you can pretty easily write your front-end, back-end, admin scripts, all in Python (even the client code if you use Pyamas, but haven't tried that myself yet).