There are some very nice information on people who are behind some very nice open source projects available on GitHub. exercism.io is one of these projects and Katrina Owen is the woman who stands behind the scenes. The platform is about gaining fluency in various programming languages. What I do like the most about it, is that there's a lot of Python related riddles. The idea of solving these puzzles, sharing your code with others, comparing with other people's solutions, upleveling your skills - it all makes this platform a very nice place focused on educational purposes. It's all for us and for free.