files and i/o — moving data in and out9 / 9

open() — and the with-block ai keeps forgetting

Checkpoint

One last thing before we move on. Same surface as a write step — but the lesson doesn't complete until this passes.

Last drill — the JSON pattern AI uses on every config file.

Import json.
Write a dict {"app": "promptdojo", "users": 1} to /tmp/config.json using json.dump(data, f) inside a with block.
Read it back with json.load(f).
Print the value of the "app" key.

Expected output:

promptdojo

⌘↵ runs the editor.

Booting Python…

Output

[promptdojo:~]$ _