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203 changes: 203 additions & 0 deletions .ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb
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{
"cells": [
{
"cell_type": "markdown",
"id": "25d7736c-ba17-4aff-b6bb-66eba20fbf4e",
"metadata": {},
"source": [
"# Lab | Error Handling"
]
},
{
"cell_type": "markdown",
"id": "bc99b386-7508-47a0-bcdb-d969deaf6c8b",
"metadata": {},
"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",
" 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(\"Invalid quantity! Please enter a non-negative value.\")\n",
" valid_quantity = True\n",
" 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",
" 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\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"
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "485dbd73-1eb0-4d45-9004-0164de722a35",
"metadata": {},
"outputs": [],
"source": [
"def calculate_total_price(products):\n",
" total_price = 0\n",
" for product in products:\n",
" while True:\n",
" try:\n",
" # Prompt user to enter price for the product\n",
" price = float(input(f\"Enter the price for {product}: \"))\n",
" # Check if price is negative\n",
" if price < 0:\n",
" print(\"Price cannot be negative. Please enter a valid price.\")\n",
" continue\n",
" # Add price to total\n",
" total_price += price\n",
" break # Exit the loop if input is valid\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a numeric price.\") # Handle non-numeric input\n",
" return total_price"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "06470ce5-603a-4503-a987-ba0263aa6254",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders(inventory):\n",
" orders = {}\n",
"\n",
" # Ask for number of orders with input validation\n",
" while True:\n",
" try:\n",
" num_orders = int(input(\"Enter number of orders: \"))\n",
" if num_orders < 0:\n",
" print(\"Number of orders cannot be negative. Please enter again.\")\n",
" continue\n",
" break\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid integer.\")\n",
"\n",
" # For each order, ask for product and quantity with validation\n",
" for _ in range(num_orders):\n",
" while True:\n",
" product = input(\"Enter product name: \")\n",
" # Check if product exists in inventory\n",
" if product not in inventory:\n",
" print(f\"Product '{product}' not found in inventory. Please enter a valid product.\")\n",
" continue\n",
" # Check if product is in stock\n",
" if inventory[product] <= 0:\n",
" print(f\"Sorry, '{product}' is out of stock. Choose another product.\")\n",
" continue\n",
" break\n",
"\n",
" while True:\n",
" try:\n",
" quantity = int(input(f\"Enter quantity of {product}: \"))\n",
" # Quantity must be positive\n",
" if quantity <= 0:\n",
" print(\"Quantity must be positive.\")\n",
" continue\n",
" # Quantity must not exceed stock\n",
" if quantity > inventory[product]:\n",
" print(f\"Only {inventory[product]} {product}(s) available. Enter a smaller quantity.\")\n",
" continue\n",
" break\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid quantity.\")\n",
"\n",
" # Record the order and update inventory\n",
" orders[product] = orders.get(product, 0) + quantity\n",
" inventory[product] -= quantity\n",
"\n",
" return orders"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "5ac80763-c23e-4a4f-9215-65e8b9838f13",
"metadata": {},
"outputs": [],
"source": [
"products = ['apple', 'banana', 'orange']\n",
"\n",
"# Initialize inventory (using your error-handling function)\n",
"inventory = initialize_inventory(products)\n",
"\n",
"# Get customer orders with validation\n",
"orders = get_customer_orders(inventory)\n",
"\n",
"# Calculate total price for ordered products\n",
"total_price = calculate_total_price(list(orders.keys()))\n",
"\n",
"print(\"Orders:\", orders)\n",
"print(\"Total price:\", total_price)"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
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"file_extension": ".py",
"mimetype": "text/x-python",
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}
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"nbformat": 4,
"nbformat_minor": 5
}
107 changes: 106 additions & 1 deletion lab-python-error-handling.ipynb
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Expand Up @@ -72,6 +72,111 @@
"\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": 1,
"id": "485dbd73-1eb0-4d45-9004-0164de722a35",
"metadata": {},
"outputs": [],
"source": [
"def calculate_total_price(products):\n",
" total_price = 0\n",
" for product in products:\n",
" while True:\n",
" try:\n",
" # Prompt user to enter price for the product\n",
" price = float(input(f\"Enter the price for {product}: \"))\n",
" # Check if price is negative\n",
" if price < 0:\n",
" print(\"Price cannot be negative. Please enter a valid price.\")\n",
" continue\n",
" # Add price to total\n",
" total_price += price\n",
" break # Exit the loop if input is valid\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a numeric price.\") # Handle non-numeric input\n",
" return total_price"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "06470ce5-603a-4503-a987-ba0263aa6254",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders(inventory):\n",
" orders = {}\n",
"\n",
" # Ask for number of orders with input validation\n",
" while True:\n",
" try:\n",
" num_orders = int(input(\"Enter number of orders: \"))\n",
" if num_orders < 0:\n",
" print(\"Number of orders cannot be negative. Please enter again.\")\n",
" continue\n",
" break\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid integer.\")\n",
"\n",
" # For each order, ask for product and quantity with validation\n",
" for _ in range(num_orders):\n",
" while True:\n",
" product = input(\"Enter product name: \")\n",
" # Check if product exists in inventory\n",
" if product not in inventory:\n",
" print(f\"Product '{product}' not found in inventory. Please enter a valid product.\")\n",
" continue\n",
" # Check if product is in stock\n",
" if inventory[product] <= 0:\n",
" print(f\"Sorry, '{product}' is out of stock. Choose another product.\")\n",
" continue\n",
" break\n",
"\n",
" while True:\n",
" try:\n",
" quantity = int(input(f\"Enter quantity of {product}: \"))\n",
" # Quantity must be positive\n",
" if quantity <= 0:\n",
" print(\"Quantity must be positive.\")\n",
" continue\n",
" # Quantity must not exceed stock\n",
" if quantity > inventory[product]:\n",
" print(f\"Only {inventory[product]} {product}(s) available. Enter a smaller quantity.\")\n",
" continue\n",
" break\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid quantity.\")\n",
"\n",
" # Record the order and update inventory\n",
" orders[product] = orders.get(product, 0) + quantity\n",
" inventory[product] -= quantity\n",
"\n",
" return orders"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "5ac80763-c23e-4a4f-9215-65e8b9838f13",
"metadata": {},
"outputs": [],
"source": [
"products = ['apple', 'banana', 'orange']\n",
"\n",
"# Initialize inventory (using your error-handling function)\n",
"inventory = initialize_inventory(products)\n",
"\n",
"# Get customer orders with validation\n",
"orders = get_customer_orders(inventory)\n",
"\n",
"# Calculate total price for ordered products\n",
"total_price = calculate_total_price(list(orders.keys()))\n",
"\n",
"print(\"Orders:\", orders)\n",
"print(\"Total price:\", total_price)"
]
}
],
"metadata": {
Expand All @@ -90,7 +195,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.3"
}
},
"nbformat": 4,
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