Function demo_practical_use_cases

python/examples/range_queries.py:67–129

Show practical real-world use cases for range queries.

()

def demo_practical_use_cases():
    """Show practical real-world use cases for range queries."""
    print("\n=== Practical Use Cases ===\n")

    # Scenario 1: Time-series data
    print("1. Time-series data (last 7 days)")
    tree = BPlusTreeMap(capacity=16)

    # Simulate daily metrics
    base_date = datetime.now()
    for i in range(30):  # 30 days of data
        date_key = int((base_date - timedelta(days=i)).timestamp())
        tree[date_key] = {
            "date": (base_date - timedelta(days=i)).strftime("%Y-%m-%d"),
            "users": random.randint(100, 1000),
            "revenue": random.randint(1000, 10000),
        }

    # Get last 7 days (most recent timestamps)
    cutoff = int((base_date - timedelta(days=7)).timestamp())
    print("   Last 7 days of metrics:")
    count = 0
    for timestamp, metrics in tree.range(cutoff, None):
        print(
            f"     {metrics['date']}: {metrics['users']} users, ${metrics['revenue']} revenue"
        )
        count += 1
        if count >= 7:
            break

    # Scenario 2: Score ranges
    print("\n2. Student grade analysis")
    grades_tree = BPlusTreeMap(capacity=8)

    students = [
        ("Alice", 95),
        ("Bob", 67),
        ("Charlie", 89),
        ("Diana", 76),
        ("Eve", 93),
        ("Frank", 54),
        ("Grace", 88),
        ("Henry", 72),
        ("Iris", 91),
        ("Jack", 63),
        ("Kate", 85),
        ("Leo", 79),
    ]

    for name, score in students:
        grades_tree[score] = name

    print("   A grades (90-100):")
    for score, name in grades_tree.range(90, 101):
        print(f"     {name}: {score}")

    print("   B grades (80-89):")
    for score, name in grades_tree.range(80, 90):