Toku test

test.py

def highest_revenue_item(data):
    products = []

    rows = data.split()

    for row in rows:
        row_data = row.split(',')

        if len(row_data) != 2:
            continue
        try:
            product_id = int(row_data[0])
            price = int(row_data[1])
        except ValueError:
            continue

        product_exists = False
        for product in products:
            if product[0] == product_id:
                product_exists = True
                product[1] += 1
                break

        if not product_exists:
            products.append([product_id, 1, price])

    highest_revenue = 0
    highest_revenue_product_id = 0

    for product in products:
        revenue = product[1] * product[2]
        if revenue > highest_revenue:
            highest_revenue = revenue
            highest_revenue_product_id = product[0]

    return highest_revenue_product_id