🐍 Python Study Book

How to use this book

• Read in order. The 16 chapters follow the official tutorial's structure. Each chapter only uses ideas from earlier chapters (or says where an idea is explained).
• Type the examples. Every example was run with Python 3.15 and its output checked. >>> blocks are for the REPL; file blocks are scripts. Use the Copy button.
• Do the exercises. Each chapter has 10+ exercises marked 🟢 easy, 🟡 medium or 🔴 hard, with hidden solutions. Try first, then peek.
• Build the practice project. Exercises marked playground grow the playground/ folder, step by step, into the Chapter 16 expense tracker. The finished version is in playground/reference/. Start with Using the Playground.
• Watch for the ☕/🟨 boxes. They compare Python with Java and JavaScript, and point out the habits that cause bugs.
• Test yourself. The Final Assessment draws 50 random questions from a pool of 1000, and scores you per chapter.
• Practise beyond the book. The 🧩 Problem Set has 100 language-neutral problems (easy, medium, hard and OOP) with exact tests — a great way to make Python stick.