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Complete error handling exercise #684

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317 changes: 315 additions & 2 deletions lab-python-error-handling.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -72,11 +72,324 @@
"\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": "code",
"execution_count": 5,
"id": "0b2e919d",
"metadata": {},
"outputs": [],
"source": [
"def initialize_inventory(products):\n",
" inventory = {}\n",
" for product in products:\n",
" valid_input = False\n",
" while not valid_input:\n",
" try:\n",
" quantity = int(input(f\"Enter the quantity of {product}s available: \"))\n",
" if quantity >= 0:\n",
" inventory[product] = quantity\n",
" valid_input = True\n",
" else:\n",
" print(\"Quantity cannot be negative. Please enter a valid quantity.\")\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid quantity.\")\n",
" return inventory"
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "d8aa1252",
"metadata": {},
"outputs": [],
"source": [
"def calculate_total_price(customer_orders):\n",
" total_price = 0\n",
"\n",
" for product in customer_orders:\n",
" valid_price = False\n",
"\n",
" while not valid_price:\n",
" try:\n",
" price = float(input(f\"Enter the price of {product}: \"))\n",
"\n",
" if price < 0:\n",
" raise ValueError(\"Price cannot be negative.\")\n",
"\n",
" valid_price = True\n",
"\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
"\n",
" total_price += price\n",
"\n",
" return total_price"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "79197f4a",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: could not convert string to float: 'abc'\n",
"Error: Price cannot be negative.\n",
"Total Price: 20.0\n"
]
}
],
"source": [
"customer_orders = {\"hat\", \"keychain\"}\n",
"\n",
"total_price = calculate_total_price(customer_orders)\n",
"\n",
"print(f\"Total Price: {total_price}\")"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "dbbb29c6",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders(inventory):\n",
" valid_number = False\n",
"\n",
" while not valid_number:\n",
" try:\n",
" number_of_orders = int(\n",
" input(\"Enter the number of customer orders: \")\n",
" )\n",
"\n",
" if number_of_orders < 0:\n",
" raise ValueError(\"Number of orders cannot be negative.\")\n",
"\n",
" valid_number = True\n",
"\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
"\n",
" customer_orders = set()\n",
"\n",
" for _ in range(number_of_orders):\n",
" valid_product = False\n",
"\n",
" while not valid_product:\n",
" try:\n",
" product = input(\n",
" \"Enter the name of a product that a customer wants to order: \"\n",
" ).lower()\n",
"\n",
" if product not in inventory:\n",
" raise ValueError(\"Product is not available in the inventory.\")\n",
"\n",
" if inventory[product] <= 0:\n",
" raise ValueError(\"Product is out of stock.\")\n",
"\n",
" if product in customer_orders:\n",
" raise ValueError(\"Product has already been ordered.\")\n",
"\n",
" customer_orders.add(product)\n",
" valid_product = True\n",
"\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
"\n",
" return customer_orders"
]
},
{
"cell_type": "code",
"execution_count": 6,
"id": "1e03748e",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Invalid input. Please enter a valid quantity.\n",
"Quantity cannot be negative. Please enter a valid quantity.\n"
]
}
],
"source": [
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
"\n",
"inventory = initialize_inventory(products)"
]
},
{
"cell_type": "code",
"execution_count": 7,
"id": "9e561b91",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: invalid literal for int() with base 10: 'abc'\n",
"Error: Number of orders cannot be negative.\n",
"Error: Product is not available in the inventory.\n",
"Error: Product has already been ordered.\n"
]
}
],
"source": [
"customer_orders = get_customer_orders(inventory)"
]
},
{
"cell_type": "code",
"execution_count": 8,
"id": "11c3120f",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: could not convert string to float: 'abc'\n",
"Error: Price cannot be negative.\n"
]
}
],
"source": [
"total_price = calculate_total_price(customer_orders)"
]
},
{
"cell_type": "code",
"execution_count": 9,
"id": "359d6538",
"metadata": {},
"outputs": [],
"source": [
"def update_inventory(customer_orders, inventory):\n",
"\n",
" inventory = {\n",
" product: quantity - 1 if product in customer_orders else quantity\n",
" for product, quantity in inventory.items()\n",
" }\n",
"\n",
" inventory = {\n",
" product: quantity\n",
" for product, quantity in inventory.items()\n",
" if quantity > 0\n",
" }\n",
"\n",
" return inventory"
]
},
{
"cell_type": "code",
"execution_count": 10,
"id": "17ef8cea",
"metadata": {},
"outputs": [],
"source": [
"def calculate_order_statistics(customer_orders, products):\n",
" total_products_ordered = len(customer_orders)\n",
"\n",
" percentage_ordered = (total_products_ordered / len(products)) * 100\n",
"\n",
" return total_products_ordered, percentage_ordered"
]
},
{
"cell_type": "code",
"execution_count": 11,
"id": "6cd80c7a",
"metadata": {},
"outputs": [],
"source": [
"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]:.1f}\")"
]
},
{
"cell_type": "code",
"execution_count": 12,
"id": "c108b090",
"metadata": {},
"outputs": [],
"source": [
"def print_updated_inventory(inventory):\n",
" print(\"\\nUpdated Inventory:\")\n",
"\n",
" inventory_lines = [\n",
" f\"{product}: {quantity}\"\n",
" for product, quantity in inventory.items()\n",
" ]\n",
"\n",
" print(\"\\n\".join(inventory_lines))"
]
},
{
"cell_type": "code",
"execution_count": 13,
"id": "e6c400b1",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Invalid input. Please enter a valid quantity.\n",
"Quantity cannot be negative. Please enter a valid quantity.\n",
"Error: invalid literal for int() with base 10: 'abc'\n",
"Error: Number of orders cannot be negative.\n",
"Error: Product is not available in the inventory.\n",
"\n",
"Order Statistics:\n",
"Total Products Ordered: 3\n",
"Percentage of Unique Products Ordered: 60.0\n",
"\n",
"Updated Inventory:\n",
"t-shirt: 10\n",
"mug: 9\n",
"hat: 9\n",
"book: 9\n",
"keychain: 10\n",
"Error: could not convert string to float: 'abc'\n",
"Error: Price cannot be negative.\n",
"Total Price: 35.4\n"
]
}
],
"source": [
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
"\n",
"inventory = initialize_inventory(products)\n",
"\n",
"customer_orders = get_customer_orders(inventory)\n",
"\n",
"order_statistics = calculate_order_statistics(customer_orders, products)\n",
"\n",
"inventory = update_inventory(customer_orders, inventory)\n",
"\n",
"print_order_statistics(order_statistics)\n",
"\n",
"print_updated_inventory(inventory)\n",
"\n",
"total_price = calculate_total_price(customer_orders)\n",
"\n",
"print(f\"Total Price: {total_price}\")"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "base",
"language": "python",
"name": "python3"
},
Expand All @@ -90,7 +403,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.9"
}
},
"nbformat": 4,
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