Introduction This is my tenth article as a Java engineer learning TypeScript and Python from scratch. This is the third project in my Python series. The first was a weight tracker CLI (type hints, pure functions, separating I/O from logic), and the second was a password generator CLI ( string , random , any , and a testing strategy for randomness). This time I built a countdown timer CLI . You pick a number of seconds from a menu, and it counts down one second at a time. Where t...