I don't know about most effective, but as for more effective recently, it was the code-base of Twisted. Not only did it have a lot of advanced libraries and wha

I don't know about most effective, but as for more effective recently, it was the code-base of Twisted. Not only did it have a lot of advanced libraries and what-not I had never encountered, but because it's been around forever I saw a sort if history of Python too.