The only path to becoming a successful data journalist is to commit oneself to a lifestyle of continuous self-learning. This is simply the price of admission to specialise in this ever-evolving field of journalism. At every turn, we are confronted with steep learning curves that require us to decide where we will invest our limited time and mental energy. These decisions are often made on the basis of the journalist’s perceived return on investment: Python or R (and then which libraries?) J...