diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb index f4c6ef6..9da9d2e 100644 --- a/lab-python-error-handling.ipynb +++ b/lab-python-error-handling.ipynb @@ -72,6 +72,178 @@ "\n", "4. Test your code by running the program and deliberately entering invalid quantities and product names. Make sure the error handling mechanism works as expected.\n" ] + }, + { + "cell_type": "markdown", + "id": "7ddfa8ca-a31b-4d0d-89c5-b828af5a1071", + "metadata": {}, + "source": [ + "**1.** `initialize_inventory(products)` \u2014 the retry loop given in the instructions above. Can't stay a one-line dict comprehension anymore: each product needs its own retry loop, so it's back to a regular loop with `try/except` inside." + ] + }, + { + "cell_type": "code", + "id": "f70e78cc-b7f0-4b90-97d4-deaf8ac96168", + "metadata": {}, + "execution_count": null, + "outputs": [], + "source": [ + "def initialize_inventory(products):\n", + " inventory = {}\n", + " for product in products:\n", + " valid_quantity = False\n", + " while not valid_quantity:\n", + " try:\n", + " quantity = int(input(f\"Enter the quantity of {product}s available: \"))\n", + " if quantity < 0:\n", + " raise ValueError(\"Quantity cannot be negative.\")\n", + " valid_quantity = True\n", + " except ValueError as error:\n", + " print(f\"Error: {error}\")\n", + " inventory[product] = quantity\n", + " return inventory" + ] + }, + { + "cell_type": "markdown", + "id": "8244da3f-b0e8-4dc1-96dd-281ebb5f0d21", + "metadata": {}, + "source": [ + "**2.** `calculate_total_price(customer_orders)` \u2014 same retry pattern per product. `float(...)` raises `ValueError` on its own for non-numeric input, so the `except` catches both that and the explicit `raise` for negative prices." + ] + }, + { + "cell_type": "code", + "id": "cd7040f6-e212-4d91-ac72-a99d989cd751", + "metadata": {}, + "execution_count": null, + "outputs": [], + "source": [ + "def calculate_total_price(customer_orders):\n", + " total_price = 0\n", + " for product in customer_orders:\n", + " valid_price = False\n", + " while not valid_price:\n", + " try:\n", + " price = float(input(f\"Enter the price of {product}: \"))\n", + " if price < 0:\n", + " raise ValueError(\"Price cannot be negative.\")\n", + " valid_price = True\n", + " except ValueError as error:\n", + " print(f\"Error: {error}\")\n", + " total_price += price\n", + " return total_price" + ] + }, + { + "cell_type": "markdown", + "id": "a94753a1-890b-4e39-b289-45e27ea2bb49", + "metadata": {}, + "source": [ + "**3.** `get_customer_orders(inventory)` \u2014 now takes `inventory` as a parameter (per the hint) so it can check a product actually exists and has stock. Two separate validation loops: one for `num_orders` (numeric, non-negative), one for the product names themselves." + ] + }, + { + "cell_type": "code", + "id": "3071fe8f-bbe0-4ac8-a727-7b7b6a709d7b", + "metadata": {}, + "execution_count": null, + "outputs": [], + "source": [ + "def get_customer_orders(inventory):\n", + " valid_number = False\n", + " while not valid_number:\n", + " try:\n", + " num_orders = int(input(\"Enter the number of customer orders: \"))\n", + " if num_orders < 0:\n", + " raise ValueError(\"Number of orders cannot be negative.\")\n", + " valid_number = True\n", + " except ValueError as error:\n", + " print(f\"Error: {error}\")\n", + "\n", + " customer_orders = set()\n", + " while len(customer_orders) < num_orders:\n", + " product = input(\"Enter the name of a product that a customer wants to order: \")\n", + " if product not in inventory:\n", + " print(f\"Error: '{product}' is not a valid product.\")\n", + " elif inventory[product] <= 0:\n", + " print(f\"Error: '{product}' is out of stock.\")\n", + " else:\n", + " customer_orders.add(product)\n", + " return customer_orders" + ] + }, + { + "cell_type": "markdown", + "id": "d3b2b2a9-0850-4a48-bd23-300a54fcfb9d", + "metadata": {}, + "source": [ + "**4.** The rest \u2014 `update_inventory`, `calculate_order_statistics` and the two `print_*` helpers \u2014 are unchanged from the comprehension lab, no invalid input to guard against there. `get_customer_orders` now needs `inventory` passed in." + ] + }, + { + "cell_type": "code", + "id": "9f22a73f-ac0e-47c3-b096-e1fb6be42c2d", + "metadata": {}, + "execution_count": null, + "outputs": [], + "source": [ + "def update_inventory(customer_orders, inventory):\n", + " updated_inventory = {\n", + " product: (quantity - 1 if product in customer_orders else quantity)\n", + " for product, quantity in inventory.items()\n", + " if product not in customer_orders or quantity - 1 > 0\n", + " }\n", + " return updated_inventory\n", + "\n", + "\n", + "def calculate_order_statistics(customer_orders, products):\n", + " total_products_ordered = len(customer_orders)\n", + " percentage_ordered = (total_products_ordered / len(products)) * 100\n", + " return total_products_ordered, percentage_ordered\n", + "\n", + "\n", + "def print_order_statistics(order_statistics):\n", + " print(\"\\nOrder Statistics:\")\n", + " print(f\"Total Products Ordered: {order_statistics[0]}\")\n", + " print(f\"Percentage of Unique Products Ordered: {order_statistics[1]}\")\n", + "\n", + "\n", + "def print_updated_inventory(inventory):\n", + " print(\"\\nUpdated Inventory:\")\n", + " for product, quantity in inventory.items():\n", + " print(f\"{product}: {quantity}\")" + ] + }, + { + "cell_type": "markdown", + "id": "c2b55085-020e-4905-8605-e16fa3c61dd7", + "metadata": {}, + "source": [ + "**5.** Call everything in sequence \u2014 same order as the comprehension lab, `get_customer_orders` just needs `inventory` passed in now." + ] + }, + { + "cell_type": "code", + "id": "cb3c410f-94e3-4c61-9026-e3a87a824029", + "metadata": {}, + "execution_count": null, + "outputs": [], + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n", + "\n", + "inventory = initialize_inventory(products)\n", + "customer_orders = get_customer_orders(inventory)\n", + "\n", + "order_statistics = calculate_order_statistics(customer_orders, products)\n", + "print_order_statistics(order_statistics)\n", + "\n", + "inventory = update_inventory(customer_orders, inventory)\n", + "print_updated_inventory(inventory)\n", + "\n", + "total_price = calculate_total_price(customer_orders)\n", + "print(f\"Total Price: {total_price}\")" + ] } ], "metadata": {