[HANDS-ON BUG] UNIT1 code cant run

[Pray3]

Describe the bug
https://huggingface.co/learn/agents-course/en/unit1/dummy-agent-library
in this section last code clip like this
messages=[
{"role": "system", "content": SYSTEM_PROMPT},
{"role": "user", "content": "What's the weather in London ?"},
{"role": "assistant", "content": output.choices[0].message.content + "Observation:\n" + get_weather('London')},
]

output = client.chat.completions.create(
messages=messages,
stream=False,
max_tokens=200,
)

print(output.choices[0].message.content)

messages depends output, output depends messages, A circular dependency was formed.