200 self-contained Python task/solution pairs: a one-paragraph spec (no test
cases, no expected outputs given) plus a complete, correct, runnable solution.
Nothing fenced, no prose — each response is pure runnable code with the entry
function. Stdlib only, difficulty from trivial to non-trivial (recursion,
generators, nested data, error handling).
Format: JSONL of {"bucket", "prompt", "response"}.
