Checkpoint
One last thing before we move on. Same surface as a write step — but the lesson doesn't complete until this passes.
Final drill. Build a multi-turn chat helper. Write chat(history, new_message)
that:
- Appends a new user turn
{"role": "user", "content": new_message}tohistory. - Calls
fake_create(history)to simulate the model. - Appends the assistant reply to
historyas{"role": "assistant", "content": <reply text>}. - Returns the updated
history.
Then the script will run two turns and print every turn's role and content. Expected output:
user: hi
assistant: hello
user: who are you?
assistant: an assistant.