My career has always been about learning the most valuable skills in the marketplace. Back when dinosaurs roamed the earth (2014), employers were pretty agnostic about rather their data people knew R or Python. However, after a few years, I started to notice the market tipping towards Python. Then I noticed that employers started going hard in the paint on Python. Then came the last straw. I tell people this all the time. I was not losing work because I did not know R. I was definitely losing work because I did not know Python.