The Shape of Real Data

Everything you've learned converges here. Real data, from an API, a spreadsheet, a database, a survey, almost always arrives in one shape: a list of records, where each record has labeled fields.

Once you can read that shape and reach into it, you can work with any dataset in the world.

✦ Read data structures inside-out

books[2]["title"] looks dense until you read it in steps: books is the list → [2] picks the third record → ["title"] pulls one field out of it. Every nested structure unwraps the same way, one layer at a time.