READ_ONLY_ACCESS
[
  {
    "id": "python-w12-000",
    "front": "Week 12 Diagnostic: If `A = np.array([1, 2, 3])`, what is the result of `A * 2`?",
    "back": "Answer: B — NumPy arrays perform element-wise vectorized arithmetic, so `A * 2` multiplies each element: `array([2, 4, 6])`."
  },
  {
    "id": "python-w12-001",
    "front": "Week 12 Diagnostic: In Pandas, which method returns the first 5 rows of a DataFrame `df`?",
    "back": "Answer: B — `df.head()` displays the top 5 rows of a Pandas DataFrame by default."
  }
]