Build your own Redis from scratch, and talk to it with the real redis-cli (opens in new tab)

Redis has a reputation for being a serious piece of infrastructure, and it is. But the core of it, the part that makes it Redis, is astonishingly small. Small enough that you can rebuild it in about 80 lines of Python, point the real redis-cli at your version, and have it just work. Same commands, same wire protocol, same behavior. That is the fun of it. By the end you will run redis-cli -p 6399 set foo bar, and the OK that comes back is from a server you wrote. This is the written companion ...