campsite.py

class Item:
    def __init__(self, name, expiry, quality):
        self.name = name
        self.expiry = expiry
        self.quality = quality


class StoreInventory:
    def __init__(self, items=None):
        if items is None:
            items = []
        self.items = items

    def update_quality(self):
        for item in self.items:
            if item.name == 'Instant Ramen':
                continue

            if item.name == 'Cheddar Cheese':
                if item.quality < 50:
                    item.quality += 1
                item.expiry -= 1

            if item.name != 'Cheddar Cheese' and item.name != 'Instant Ramen':
                item.expiry -= 1
                if item.expiry > 0 and item.quality > 0:
                    item.quality -= 1

                if item.expiry < 0:
                    if item.quality > 1:
                        item.quality -= 2
                    elif item.quality == 1:
                        item.quality -= 1
        return self.items


items = [
    Item("Apple", 10, 10),
    Item("Banana", 7, 9),
    Item("Strawberry", 5, 10),
    Item("Cheddar Cheese", 10, 16),
    Item("Instant Ramen", 0, 5),
    # this Organic item does not work properly yet
    Item("Organic Avocado", 5, 16)
]

store_inventory = StoreInventory(items)

days = 2

for i in range(days):
    print(f"Day {i}  ---------------------------------")
    print("                  name      expiry quality")
    data = [(element.name, element.expiry, element.quality) for element in items]
    for item in data:
        print(item)
    print()
    store_inventory.update_quality()


# Unit Tests 

# Python's built-in unittest module can be used for writing tests
# It's not exactly the same as the original TypeScript test code, but serves the same purpose

import unittest

class TestItem(unittest.TestCase):
    def test_quality_decreases_daily(self):
        print("Running test: Quality decreases daily")
        test_items = [Item("test", 10, 10)]
        test_inventory = StoreInventory(test_items)
        test_inventory.update_quality()
        self.assertEqual(test_items[0].quality, 9)

    def test_cheddar_cheese_quality_increases_daily(self):
        print("Running test: Cheddar Cheese increases daily")
        test_items = [Item("Cheddar Cheese", 10, 10)]
        test_inventory = StoreInventory(test_items)
        test_inventory.update_quality()
        self.assertEqual(test_items[0].quality, 11)

if __name__ == '__main__':
    unittest.main()