with open('problem5.csv', 'rb') as f:
    data = f.readlines()

    price_table = {}

for i, line in enumerate(data):
    processed_line = line.decode().strip().split(';')
    if i == 0:
        product_names = [product_name for product_name in processed_line if len(product_name) > 0]
    else:
        supermarket = processed_line[0]

        price_table.update({
            supermarket: {product_name: float(price) for product_name, price in zip(product_names, processed_line[1:])}
        })

cheapest_product = []
min_price = None
for supermarket, products in price_table.items():
    new_min = min(products.values())
    if not min_price:
        min_price = new_min

    elif new_min <= min_price:
        min_price = new_min
        for product_name, price in products.items():
            if price == min_price:
                if not cheapest_product:
                   cheapest_product = (product_name, supermarket, min_price)

cheapest_product