Checkpoint
One last thing before we move on. Same surface as a write step — but the lesson doesn't complete until this passes.
Lesson two lock-in. The starter declares three variables for the
Codex setup steps. Write three print(f"...") lines so the output is
exactly:
install: brew on a mac, or npm which needs node first
verify: codex --version prints a version number
sign in: codex login, a browser approval with your chatgpt account
Type the three lines and run it.