As a relative newb, who got his first real experience with AS3 (flash games), I've put some serious thought into this issue. I've seen that job chart come up a number of times, and it's true that python is bigger now. But clicking on relative gives a startlingly opposite picture:

http://www.indeed.com/jobtrends?q=python%2C+ruby&l=&...

For now, since I've gotten a programming job (yay!) at an iOS shop, I've gotta work on Obj. C. But when the time comes to really get good at a higher level language, it's hard to say which way I'll go.