Python Hello World Function

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Question

Write Python 3.12 code only.
Define exactly one function named hello_world.
The function must print exactly: Hello world
Do not use any imports (no numpy, requests, or other libraries).
Sandbox note: dunder attribute access is blocked (for example, type(x).__name__). Avoid names/attributes starting with '__'.

Expected output format:
- Return exactly one fenced Markdown code block starting with ```python and ending with ```.
- Put only valid Python code inside that block (no prose before/after).
- Use 4 spaces for indentation (not tabs).
- Do not return JSON and do not wrap code in a "function" key.

Task:
Write a Python 3.12 function that prints Hello world.

Question payload

{
  "question_text": "Write Python 3.12 code only.\nDefine exactly one function named hello_world.\nThe function must print exactly: Hello world\nDo not use any imports (no numpy, requests, or other libraries).\nSandbox note: dunder attribute access is blocked (for example, type(x).__name__). Avoid names/attributes starting with '__'.\n\nExpected output format:\n- Return exactly one fenced Markdown code block starting with ```python and ending with ```.\n- Put only valid Python code inside that block (no prose before/after).\n- Use 4 spaces for indentation (not tabs).\n- Do not return JSON and do not wrap code in a \"function\" key.\n\nTask:\nWrite a Python 3.12 function that prints Hello world.",
  "answer_type": "free_text",
  "correct_answer": {
    "function_name": "hello_world",
    "test_cases": [
      {
        "args": [],
        "expected": "Hello world",
        "capture_stdout": true
      }
    ]
  },
  "category": "coding",
  "difficulty": "medium",
  "tags": [
    "python",
    "coding",
    "security"
  ],
  "evaluation_criteria": {
    "exact_match": false,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}