Technically speaking, nothing done in R can't be replicated in Python. I don't know what you are trying to do. Still, if you know Python and do not know R, you should be able to do everything in Python, UNLESS there is a very specific task and the library to do it only exists in R (you could still re-write it in Python, but ok, that would require time and a good knowledge of Python). There are ways to call R from inside Python calling R from Python, or you could use a separate script. That said, your link doesn't seem to use R at all. I strongly feel it's just down to personal preferences and training. For example, I was trained to use R for plots. But Python is perfectly able to produce good plots. I think you get the idea.