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260 changes: 210 additions & 50 deletions lab-python-error-handling.ipynb
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Original file line number Diff line number Diff line change
@@ -1,28 +1,22 @@
{
"cells": [
{
"cell_type": "markdown",
"id": "25d7736c-ba17-4aff-b6bb-66eba20fbf4e",
"cell_type": "code",
"execution_count": 1,
"id": "0065f99d-7e92-4057-a3ee-d1bdfa906913",
"metadata": {},
"outputs": [],
"source": [
"# Lab | Error Handling"
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]"
]
},
{
"cell_type": "markdown",
"id": "bc99b386-7508-47a0-bcdb-d969deaf6c8b",
"cell_type": "code",
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"id": "2d7bcb94-c866-4638-b788-b95bd4f81025",
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"source": [
"## Exercise: Error Handling for Managing Customer Orders\n",
"\n",
"The implementation of your code for managing customer orders assumes that the user will always enter a valid input. \n",
"\n",
"For example, we could modify the `initialize_inventory` function to include error handling.\n",
" - If the user enters an invalid quantity (e.g., a negative value or a non-numeric value), display an error message and ask them to re-enter the quantity for that product.\n",
" - Use a try-except block to handle the error and continue prompting the user until a valid quantity is entered.\n",
"\n",
"```python\n",
"# Step 1: Define the function for initializing the inventory with error handling\n",
"def initialize_inventory(products):\n",
" inventory = {}\n",
" for product in products:\n",
Expand All @@ -36,49 +30,215 @@
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
" inventory[product] = quantity\n",
" return inventory\n",
"\n",
"# Or, in another way:\n",
"\n",
"def initialize_inventory(products):\n",
" inventory = {}\n",
" for product in products:\n",
" valid_input = False\n",
" while not valid_input:\n",
" return inventory"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "b1dd0f80-694e-4ba2-b983-9ce649ecfc01",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders(inventory):\n",
" print(\"\\n--- Customer Orders ---\")\n",
" while True:\n",
" try:\n",
" num_orders = int(input(\"Enter the number of customer orders: \"))\n",
" if num_orders < 0:\n",
" print(\"Number of orders cannot be negative. Please enter a valid number.\")\n",
" else:\n",
" break\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a numeric value for the number of orders.\")\n",
" customer_orders = set()\n",
" for _ in range(num_orders):\n",
" valid_product = False\n",
" while not valid_product:\n",
" product_name = input(\"Enter the name of a product that a customer wants to order: \").lower()\n",
" if product_name not in inventory:\n",
" print(\"Invalid product name. This product is not in the inventory.\")\n",
" elif inventory[product_name] <= 0:\n",
" print(f\"No stock available for {product_name}. Please choose another product.\")\n",
" else:\n",
" customer_orders.add(product_name)\n",
" valid_product = True\n",
" return customer_orders"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "ef02730b-e374-4e3f-8264-f00bea4efce3",
"metadata": {},
"outputs": [],
"source": [
"def update_inventory(customer_orders, inventory):\n",
" for product in customer_orders:\n",
" if product in inventory and inventory[product] > 0:\n",
" inventory[product] -= 1\n",
" inventory = {product: qty for product, qty in inventory.items() if qty > 0}\n",
" return inventory"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "01a3ae03-3b72-4696-ae6b-fe25cc3d9d89",
"metadata": {},
"outputs": [],
"source": [
"def calculate_order_statistics(customer_orders, products):\n",
" total = len(customer_orders)\n",
" percentage = (total / len(products)) * 100 if products else 0\n",
" return total, percentage"
]
},
{
"cell_type": "code",
"execution_count": 6,
"id": "a203c9a5-001f-4e48-9992-5d2aae58adaa",
"metadata": {},
"outputs": [],
"source": [
"def print_order_statistics(order_statistics):\n",
" total, percentage = order_statistics\n",
" print(\"\\nOrder Statistics:\")\n",
" print(f\"Total Products Ordered: {total}\")\n",
" print(f\"Percentage of Unique Products Ordered: {percentage}\")"
]
},
{
"cell_type": "code",
"execution_count": 7,
"id": "461347b5-c77f-4e65-ac54-9f68948a12ec",
"metadata": {},
"outputs": [],
"source": [
"def print_updated_inventory(inventory):\n",
" print(\"\\nUpdated Inventory:\")\n",
" [print(f\"{product}: {qty}\") for product, qty in inventory.items()]"
]
},
{
"cell_type": "code",
"execution_count": 8,
"id": "c42da3d3-1ae1-42f1-aa9d-20ec4cc8cab5",
"metadata": {},
"outputs": [],
"source": [
"def calculate_total_price(customer_orders):\n",
" print(\"\\n--- Calculate Total Price ---\")\n",
" total_price = 0.0\n",
" for product in customer_orders:\n",
" valid_price = False\n",
" while not valid_price:\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",
" price = float(input(f\"Enter the price of {product}: \"))\n",
" if price < 0:\n",
" print(\"Price cannot be negative. Please enter a valid price.\")\n",
" else:\n",
" print(\"Quantity cannot be negative. Please enter a valid quantity.\")\n",
" total_price += price\n",
" valid_price = True\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid quantity.\")\n",
" return inventory\n",
"```\n",
"\n",
"Let's enhance your code by implementing error handling to handle invalid inputs.\n",
"\n",
"Follow the steps below to complete the exercise:\n",
"\n",
"2. Modify the `calculate_total_price` function to include error handling.\n",
" - If the user enters an invalid price (e.g., a negative value or a non-numeric value), display an error message and ask them to re-enter the price for that product.\n",
" - Use a try-except block to handle the error and continue prompting the user until a valid price is entered.\n",
"\n",
"3. Modify the `get_customer_orders` function to include error handling.\n",
" - If the user enters an invalid number of orders (e.g., a negative value or a non-numeric value), display an error message and ask them to re-enter the number of orders.\n",
" - If the user enters an invalid product name (e.g., a product name that is not in the inventory), or that doesn't have stock available, display an error message and ask them to re-enter the product name. *Hint: you will need to pass inventory as a parameter*\n",
" - Use a try-except block to handle the error and continue prompting the user until a valid product name is entered.\n",
"\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"
" print(\"Invalid input. Please enter a numeric value for the price.\")\n",
" return total_price"
]
},
{
"cell_type": "code",
"execution_count": 9,
"id": "5c20ef0e-ace2-44f3-bc83-23b002eb91c7",
"metadata": {},
"outputs": [
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the quantity of t-shirts available: 5\n",
"Enter the quantity of mugs available: 4\n",
"Enter the quantity of hats available: 3\n",
"Enter the quantity of books available: 2\n",
"Enter the quantity of keychains available: 1\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"\n",
"--- Customer Orders ---\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the number of customer orders: 2\n",
"Enter the name of a product that a customer wants to order: hat\n",
"Enter the name of a product that a customer wants to order: keychain\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"\n",
"Order Statistics:\n",
"Total Products Ordered: 2\n",
"Percentage of Unique Products Ordered: 40.0\n",
"\n",
"Updated Inventory:\n",
"t-shirt: 5\n",
"mug: 4\n",
"hat: 2\n",
"book: 2\n",
"\n",
"--- Calculate Total Price ---\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the price of hat: 5\n",
"Enter the price of keychain: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"\n",
"Total Price: 15.0\n"
]
}
],
"source": [
"inventory = initialize_inventory(products)\n",
"customer_orders = get_customer_orders(inventory)\n",
"order_stats = calculate_order_statistics(customer_orders, products)\n",
"print_order_statistics(order_stats)\n",
"inventory = update_inventory(customer_orders, inventory)\n",
"print_updated_inventory(inventory)\n",
"total_price = calculate_total_price(customer_orders)\n",
"print(f\"\\nTotal Price: {total_price}\")"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "adcf3b3a-6d42-49c8-a03d-31f771e3abda",
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "Python [conda env:base] *",
"language": "python",
"name": "python3"
"name": "conda-base-py"
},
"language_info": {
"codemirror_mode": {
Expand All @@ -90,7 +250,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.9"
}
},
"nbformat": 4,
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