Python & Java, in depth

Every feature. Real code.
Real output.

Each topic here was actually executed — Python 3.12 and OpenJDK 21 — and the recorded output is exactly what came back, not a description of what “should” happen. Every topic also carries an interview angle and an industry-practice note, and Python topics get a live, editable playground powered by Pyodide, running real CPython in your browser.