Lesson 3 — The network: how data moves and what others can see
Unit I · Substrate and mechanism

L03_lookup.py                                student     One DNS lookup and one HTTPS request to example.com; prints what an observer could and could not see. Prints a labelled example if offline.

Python 3.11 or newer. Standard library only. Run each program from the folder the lesson tells you to put it in:
    python <file>.py        (Windows)
    python3 <file>.py       (macOS and Linux)
