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216 changes: 216 additions & 0 deletions lab-python-error-handling.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,222 @@
"\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": "2d6d41ee",
"metadata": {},
"source": [
"## Solution"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "33ee11af",
"metadata": {},
"outputs": [],
"source": [
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
"\n",
"\n",
"def initialize_inventory(products):\n",
" inventory = {}\n",
"\n",
" for product in products:\n",
" while True:\n",
" try:\n",
" quantity = int(input(f\"Enter the quantity of {product}s available: \"))\n",
" if quantity < 0:\n",
" raise ValueError\n",
" except ValueError:\n",
" print(\"Invalid quantity. Please enter a non-negative whole number.\")\n",
" else:\n",
" inventory[product] = quantity\n",
" break\n",
"\n",
" return inventory"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "0f51f9cb",
"metadata": {},
"outputs": [],
"source": [
"def calculate_total_price(customer_orders):\n",
" total_price = 0\n",
" product_prices = {}\n",
"\n",
" for product in customer_orders:\n",
" if product not in product_prices:\n",
" while True:\n",
" try:\n",
" price = float(input(f\"Enter the price of {product}: \"))\n",
" if price < 0:\n",
" raise ValueError\n",
" except ValueError:\n",
" print(\"Invalid price. Please enter a non-negative number.\")\n",
" else:\n",
" product_prices[product] = price\n",
" break\n",
"\n",
" total_price += product_prices[product]\n",
"\n",
" return total_price"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "ebc622d0",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders(inventory):\n",
" customer_orders = []\n",
" temporary_inventory = inventory.copy()\n",
" inventory_lookup = {product.lower(): product for product in inventory}\n",
"\n",
" while True:\n",
" try:\n",
" number_of_orders = int(input(\"Enter the number of customer orders: \"))\n",
" if number_of_orders < 0:\n",
" raise ValueError\n",
" except ValueError:\n",
" print(\"Invalid number of orders. Please enter a non-negative whole number.\")\n",
" else:\n",
" break\n",
"\n",
" for order_number in range(number_of_orders):\n",
" while True:\n",
" try:\n",
" product_input = input(f\"Enter product #{order_number + 1}: \").strip().lower()\n",
"\n",
" if product_input not in inventory_lookup:\n",
" raise ValueError(\"That product is not in the inventory.\")\n",
"\n",
" product = inventory_lookup[product_input]\n",
"\n",
" if temporary_inventory[product] <= 0:\n",
" raise ValueError(\"That product is out of stock.\")\n",
" except ValueError as error:\n",
" print(f\"Error: {error} Please enter a valid product name.\")\n",
" else:\n",
" customer_orders.append(product)\n",
" temporary_inventory[product] -= 1\n",
" break\n",
"\n",
" return customer_orders"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "ce5d4a5d",
"metadata": {},
"outputs": [],
"source": [
"def update_inventory(customer_orders, inventory):\n",
" updated_inventory = inventory.copy()\n",
"\n",
" for product in customer_orders:\n",
" if product in updated_inventory and updated_inventory[product] > 0:\n",
" updated_inventory[product] -= 1\n",
"\n",
" return updated_inventory\n",
"\n",
"\n",
"def calculate_order_statistics(customer_orders, products):\n",
" total_products_ordered = len(customer_orders)\n",
" unique_products_ordered = len(set(customer_orders))\n",
" percentage_unique_products_ordered = 0\n",
"\n",
" if products:\n",
" percentage_unique_products_ordered = (unique_products_ordered / len(products)) * 100\n",
"\n",
" return total_products_ordered, percentage_unique_products_ordered"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "f7050058",
"metadata": {},
"outputs": [],
"source": [
"def run_shop():\n",
" inventory = initialize_inventory(products)\n",
" customer_orders = get_customer_orders(inventory)\n",
" total_price = calculate_total_price(customer_orders)\n",
" updated_inventory = update_inventory(customer_orders, inventory)\n",
" order_statistics = calculate_order_statistics(customer_orders, products)\n",
"\n",
" print(\"\\nCustomer orders:\", customer_orders)\n",
" print(\"Total price:\", total_price)\n",
" print(\"Updated inventory:\", updated_inventory)\n",
" print(\"Order statistics:\", order_statistics)\n",
"\n",
" return inventory, customer_orders, total_price, updated_inventory, order_statistics\n",
"\n",
"\n",
"# Run this when you want to test the program manually:\n",
"# run_shop()"
]
},
{
"cell_type": "markdown",
"id": "4587366d",
"metadata": {},
"source": [
"## Non-interactive check"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "8462e3b3",
"metadata": {},
"outputs": [],
"source": [
"from unittest.mock import patch\n",
"\n",
"\n",
"test_inputs = iter([\n",
" \"-2\", \"two\", \"2\", \"0\", \"5\", \"1\", \"3\",\n",
" \"abc\", \"-1\", \"4\",\n",
" \"phone\", \"mug\", \"hat\", \"t-shirt\", \"t-shirt\", \"t-shirt\", \"book\",\n",
" \"free\", \"-3\", \"15.50\", \"12\", \"8.25\",\n",
"])\n",
"\n",
"with patch(\"builtins.input\", lambda prompt=\"\": next(test_inputs)):\n",
" sample_inventory = initialize_inventory(products)\n",
" sample_orders = get_customer_orders(sample_inventory)\n",
" sample_total = calculate_total_price(sample_orders)\n",
" sample_updated_inventory = update_inventory(sample_orders, sample_inventory)\n",
" sample_statistics = calculate_order_statistics(sample_orders, products)\n",
"\n",
"assert sample_inventory == {\n",
" \"t-shirt\": 2,\n",
" \"mug\": 0,\n",
" \"hat\": 5,\n",
" \"book\": 1,\n",
" \"keychain\": 3,\n",
"}\n",
"assert sample_orders == [\"hat\", \"t-shirt\", \"t-shirt\", \"book\"]\n",
"assert sample_total == 47.75\n",
"assert sample_updated_inventory == {\n",
" \"t-shirt\": 0,\n",
" \"mug\": 0,\n",
" \"hat\": 4,\n",
" \"book\": 0,\n",
" \"keychain\": 3,\n",
"}\n",
"assert sample_statistics == (4, 60.0)\n",
"\n",
"print(\"All checks passed.\")"
]
}
],
"metadata": {
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