Python Letter Count in String

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Question

Write Python 3.12 code only.
Define exactly one function named count_target_letter(text, target).
Return how many times the target letter appears in the string.
Count should be case-insensitive.
Raise TypeError for non-string input, and raise ValueError if target is not exactly one character.
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.

Sample input/output behavior:
- count_target_letter("Mississippi", "s") -> 4

Task:
Write a Python 3.12 function for 'how many times does the target letter appear in a string'.

Question payload

{
  "question_text": "Write Python 3.12 code only.\nDefine exactly one function named count_target_letter(text, target).\nReturn how many times the target letter appears in the string.\nCount should be case-insensitive.\nRaise TypeError for non-string input, and raise ValueError if target is not exactly one character.\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\nSample input/output behavior:\n- count_target_letter(\"Mississippi\", \"s\") -> 4\n\nTask:\nWrite a Python 3.12 function for 'how many times does the target letter appear in a string'.",
  "answer_type": "free_text",
  "correct_answer": {
    "function_name": "count_target_letter",
    "test_cases": [
      {
        "args": [
          "banana",
          "a"
        ],
        "expected": 3
      },
      {
        "args": [
          "Mississippi",
          "s"
        ],
        "expected": 4
      },
      {
        "args": [
          "Hello",
          "l"
        ],
        "expected": 2
      },
      {
        "args": [
          "Abracadabra",
          "a"
        ],
        "expected": 5
      },
      {
        "args": [
          "CaseSensitive",
          "c"
        ],
        "expected": 1
      },
      {
        "args": [
          "",
          "x"
        ],
        "expected": 0
      },
      {
        "args": [
          "aaaa",
          "a"
        ],
        "expected": 4
      },
      {
        "args": [
          "letter",
          "tt"
        ],
        "expected_exception": "ValueError"
      },
      {
        "args": [
          42,
          "a"
        ],
        "expected_exception": "TypeError"
      },
      {
        "args": [
          "abc",
          1
        ],
        "expected_exception": "TypeError"
      }
    ]
  },
  "category": "coding",
  "difficulty": "medium",
  "tags": [
    "python",
    "coding",
    "security"
  ],
  "evaluation_criteria": {
    "exact_match": false,
    "case_sensitive": false,
    "contains": false,
    "required_fields": [],
    "tolerance": 0.0,
    "alternatives": []
  }
}