Some of this may also simply be a result of doing some exercises in Python (in the coursera class), and not doing any R. I was pretty bummed that we didn't't get at all into R in the coursera class, because sometimes just getting set up a little bit (like having some sample skeleton files for homework) and a few exercises can make a big difference. Not meant as a knock on the course, which was free and (I thought) very good. But a bit of exposure to R would be helpful (while I appreciate the importance of visualization, I do think that given the choice between tableau and an intro to R, I'd definitely have preferred R).