Python, for all its power and popularity, has long lacked a form of flow control found in other languages—a way to take a value and match it elegantly against one of a number of possible conditions.

Documentation isn't beginner-friendly, and tutorials often leave gaps. Learning Python can feel overwhelming, so you're not alone. To address this, I have prepared a concise, no-nonsense guide to ...

On a lot of DataFrame objects, the index will typically be an ascending list of numbers. If I have something with dates, I ...