From e854ab2de3f88addd7dc1129b24dd4b2e6f91655 Mon Sep 17 00:00:00 2001 From: alanlupatini Date: Tue, 2 Dec 2025 09:45:19 +0100 Subject: [PATCH 1/2] completed lab --- ...lab-python-error-handling-checkpoint.ipynb | 223 ++++++++++++++++++ lab-python-error-handling.ipynb | 131 +++++++++- 2 files changed, 351 insertions(+), 3 deletions(-) create mode 100644 .ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb diff --git a/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb b/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb new file mode 100644 index 0000000..ea5e117 --- /dev/null +++ b/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb @@ -0,0 +1,223 @@ +{ + "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": null, + "id": "5820edf5-1ec5-4f0e-8e97-178268928853", + "metadata": {}, + "outputs": [], + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n", + "\n", + "def initialize_inventory(products):\n", + " print(\"\\nINITIALIZING INVENTORY\")\n", + " inventory = {\n", + " product: int(input(f\"Enter quantity of {product}s available: \"))\n", + " for product in products\n", + " }\n", + " return inventory\n", + "\n", + "def get_customer_orders(inventory):\n", + " customer_orders = []\n", + " print(\"\\nSTARTING ORDER PROCESS\")\n", + "\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 must be non-negative. Try again.\")\n", + " continue\n", + " break\n", + " except ValueError:\n", + " print(\"Invalid input. Enter a whole number.\")\n", + "\n", + " print(\"--- Enter product names for order ---\")\n", + " \n", + " for i in range(num_orders):\n", + " while True:\n", + " product_name = input(f\"Enter the name of product {i+1} that a customer wants to order: \").strip()\n", + " if product_name in inventory:\n", + " customer_orders.append(product_name)\n", + " break\n", + " else:\n", + " print(f\"'{product_name}' not found. Try again.\")\n", + " \n", + " return customer_orders\n", + "\n", + "def calculate_total_price(customer_orders):\n", + " print(\"\\nCALCULATING TOTAL PRICE\")\n", + "\n", + " product_prices = {\n", + " product: float(input(f\"Enter the price of {product}: \"))\n", + " for product in set(customer_orders)\n", + " }\n", + " \n", + " total_price = sum(product_prices[product] for product in customer_orders)\n", + " \n", + " return total_price\n", + "\n", + "def update_inventory(customer_orders, inventory):\n", + " print(\"\\nUPDATING INVENTORY\")\n", + " \n", + " for product in customer_orders:\n", + " if product in inventory and inventory[product] > 0:\n", + " inventory[product] -= 1\n", + "\n", + " inventory = {\n", + " product: quantity\n", + " for product, quantity in inventory.items()\n", + " if quantity > 0\n", + " }\n", + " \n", + " return inventory\n", + "\n", + "def calculate_order_statistics(customer_orders, products):\n", + " print(\"\\nCALCULATING STATISTICS\")\n", + " \n", + " unique_products_ordered = set(customer_orders)\n", + " \n", + " total_products_ordered = len(customer_orders)\n", + " total_unique_products_available = len(products)\n", + " \n", + " if total_unique_products_available > 0:\n", + " percentage_ordered = (len(unique_products_ordered) / total_unique_products_available) * 100\n", + " else:\n", + " percentage_ordered = 0.0\n", + " \n", + " return total_products_ordered, percentage_ordered\n", + "\n", + "def print_order_statistics(total_products_ordered, percentage_ordered):\n", + " print(\"\\nORDER STATISTICS REPORT\")\n", + " print(f\"Total Products Ordered: {total_products_ordered}\")\n", + " print(f\"Percentage of Unique Products Ordered: {percentage_ordered:.2f}%\")\n", + "\n", + "def print_updated_inventory(inventory):\n", + " print(\"\\nUPDATED INVENTORY\")\n", + " \n", + " print(\"Product | Stock\")\n", + " print(\"----------------\")\n", + " for product, quantity in inventory.items():\n", + " print(f\"{product:<7} | {quantity}\")\n", + "\n", + "def main():\n", + " print(\"--- STARTING ORDER MANAGEMENT PROGRAM ---\")\n", + " \n", + " current_inventory = initialize_inventory(products)\n", + " \n", + " orders_list = get_customer_orders(current_inventory)\n", + " \n", + " total_price = calculate_total_price(orders_list)\n", + " \n", + " final_inventory = update_inventory(orders_list, current_inventory)\n", + " \n", + " total_ordered, percentage_stats = calculate_order_statistics(orders_list, products)\n", + " \n", + " print_order_statistics(total_ordered, percentage_stats)\n", + " \n", + " print_updated_inventory(final_inventory)\n", + "\n", + " # 5. Print the total price of the customer order (as requested in the screenshot)\n", + " print(f\"\\nTotal Price: {total_price:.2f}\")\n", + "\n", + " print(\"\\n--- PROGRAM FINISHED ---\")\n", + "\n", + "if __name__ == \"__main__\":\n", + " main()" + ] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python [conda env:base] *", + "language": "python", + "name": "conda-base-py" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 3 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython3", + "version": "3.13.5" + } + }, + "nbformat": 4, + "nbformat_minor": 5 +} diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb index f4c6ef6..ea5e117 100644 --- a/lab-python-error-handling.ipynb +++ b/lab-python-error-handling.ipynb @@ -72,13 +72,138 @@ "\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": null, + "id": "5820edf5-1ec5-4f0e-8e97-178268928853", + "metadata": {}, + "outputs": [], + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n", + "\n", + "def initialize_inventory(products):\n", + " print(\"\\nINITIALIZING INVENTORY\")\n", + " inventory = {\n", + " product: int(input(f\"Enter quantity of {product}s available: \"))\n", + " for product in products\n", + " }\n", + " return inventory\n", + "\n", + "def get_customer_orders(inventory):\n", + " customer_orders = []\n", + " print(\"\\nSTARTING ORDER PROCESS\")\n", + "\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 must be non-negative. Try again.\")\n", + " continue\n", + " break\n", + " except ValueError:\n", + " print(\"Invalid input. Enter a whole number.\")\n", + "\n", + " print(\"--- Enter product names for order ---\")\n", + " \n", + " for i in range(num_orders):\n", + " while True:\n", + " product_name = input(f\"Enter the name of product {i+1} that a customer wants to order: \").strip()\n", + " if product_name in inventory:\n", + " customer_orders.append(product_name)\n", + " break\n", + " else:\n", + " print(f\"'{product_name}' not found. Try again.\")\n", + " \n", + " return customer_orders\n", + "\n", + "def calculate_total_price(customer_orders):\n", + " print(\"\\nCALCULATING TOTAL PRICE\")\n", + "\n", + " product_prices = {\n", + " product: float(input(f\"Enter the price of {product}: \"))\n", + " for product in set(customer_orders)\n", + " }\n", + " \n", + " total_price = sum(product_prices[product] for product in customer_orders)\n", + " \n", + " return total_price\n", + "\n", + "def update_inventory(customer_orders, inventory):\n", + " print(\"\\nUPDATING INVENTORY\")\n", + " \n", + " for product in customer_orders:\n", + " if product in inventory and inventory[product] > 0:\n", + " inventory[product] -= 1\n", + "\n", + " inventory = {\n", + " product: quantity\n", + " for product, quantity in inventory.items()\n", + " if quantity > 0\n", + " }\n", + " \n", + " return inventory\n", + "\n", + "def calculate_order_statistics(customer_orders, products):\n", + " print(\"\\nCALCULATING STATISTICS\")\n", + " \n", + " unique_products_ordered = set(customer_orders)\n", + " \n", + " total_products_ordered = len(customer_orders)\n", + " total_unique_products_available = len(products)\n", + " \n", + " if total_unique_products_available > 0:\n", + " percentage_ordered = (len(unique_products_ordered) / total_unique_products_available) * 100\n", + " else:\n", + " percentage_ordered = 0.0\n", + " \n", + " return total_products_ordered, percentage_ordered\n", + "\n", + "def print_order_statistics(total_products_ordered, percentage_ordered):\n", + " print(\"\\nORDER STATISTICS REPORT\")\n", + " print(f\"Total Products Ordered: {total_products_ordered}\")\n", + " print(f\"Percentage of Unique Products Ordered: {percentage_ordered:.2f}%\")\n", + "\n", + "def print_updated_inventory(inventory):\n", + " print(\"\\nUPDATED INVENTORY\")\n", + " \n", + " print(\"Product | Stock\")\n", + " print(\"----------------\")\n", + " for product, quantity in inventory.items():\n", + " print(f\"{product:<7} | {quantity}\")\n", + "\n", + "def main():\n", + " print(\"--- STARTING ORDER MANAGEMENT PROGRAM ---\")\n", + " \n", + " current_inventory = initialize_inventory(products)\n", + " \n", + " orders_list = get_customer_orders(current_inventory)\n", + " \n", + " total_price = calculate_total_price(orders_list)\n", + " \n", + " final_inventory = update_inventory(orders_list, current_inventory)\n", + " \n", + " total_ordered, percentage_stats = calculate_order_statistics(orders_list, products)\n", + " \n", + " print_order_statistics(total_ordered, percentage_stats)\n", + " \n", + " print_updated_inventory(final_inventory)\n", + "\n", + " # 5. Print the total price of the customer order (as requested in the screenshot)\n", + " print(f\"\\nTotal Price: {total_price:.2f}\")\n", + "\n", + " print(\"\\n--- PROGRAM FINISHED ---\")\n", + "\n", + "if __name__ == \"__main__\":\n", + " main()" + ] } ], "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": { @@ -90,7 +215,7 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.9.13" + "version": "3.13.5" } }, "nbformat": 4, From 6129f47006763907da4f5c28953eba3dced71cb3 Mon Sep 17 00:00:00 2001 From: alanlupatini Date: Tue, 2 Dec 2025 09:49:26 +0100 Subject: [PATCH 2/2] completed lab v2 --- ...lab-python-error-handling-checkpoint.ipynb | 41 +++++++++++++++---- lab-python-error-handling.ipynb | 41 +++++++++++++++---- 2 files changed, 66 insertions(+), 16 deletions(-) diff --git a/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb b/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb index ea5e117..166ae9d 100644 --- a/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb +++ b/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb @@ -84,10 +84,21 @@ "\n", "def initialize_inventory(products):\n", " print(\"\\nINITIALIZING INVENTORY\")\n", - " inventory = {\n", - " product: int(input(f\"Enter quantity of {product}s available: \"))\n", - " for product in products\n", - " }\n", + " inventory = {}\n", + " \n", + " for product in products:\n", + " while True:\n", + " try:\n", + " # 1. Error handling for invalid quantity (non-integer or negative)\n", + " quantity = int(input(f\"Enter quantity of {product}s available: \"))\n", + " if quantity < 0:\n", + " print(\"**Error:** Quantity must be a non-negative whole number. Please try again.\")\n", + " continue\n", + " inventory[product] = quantity\n", + " break\n", + " except ValueError:\n", + " print(\"**Error:** Invalid input. Please enter a whole number for the quantity.\")\n", + " \n", " return inventory\n", "\n", "def get_customer_orders(inventory):\n", @@ -120,10 +131,24 @@ "def calculate_total_price(customer_orders):\n", " print(\"\\nCALCULATING TOTAL PRICE\")\n", "\n", - " product_prices = {\n", - " product: float(input(f\"Enter the price of {product}: \"))\n", - " for product in set(customer_orders)\n", - " }\n", + " product_prices = {}\n", + " \n", + " # Get unique products to ask for price only once\n", + " unique_products_ordered = set(customer_orders)\n", + "\n", + " for product in unique_products_ordered:\n", + " while True:\n", + " try:\n", + " # 2. Error handling for invalid price (non-numeric or negative)\n", + " price_input = input(f\"Enter the price of {product}: \")\n", + " price = float(price_input)\n", + " if price < 0:\n", + " print(\"**Error:** Price must be non-negative. Please try again.\")\n", + " continue\n", + " product_prices[product] = price\n", + " break\n", + " except ValueError:\n", + " print(\"**Error:** Invalid input. Please enter a valid number (e.g., 19.99) for the price.\")\n", " \n", " total_price = sum(product_prices[product] for product in customer_orders)\n", " \n", diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb index ea5e117..166ae9d 100644 --- a/lab-python-error-handling.ipynb +++ b/lab-python-error-handling.ipynb @@ -84,10 +84,21 @@ "\n", "def initialize_inventory(products):\n", " print(\"\\nINITIALIZING INVENTORY\")\n", - " inventory = {\n", - " product: int(input(f\"Enter quantity of {product}s available: \"))\n", - " for product in products\n", - " }\n", + " inventory = {}\n", + " \n", + " for product in products:\n", + " while True:\n", + " try:\n", + " # 1. Error handling for invalid quantity (non-integer or negative)\n", + " quantity = int(input(f\"Enter quantity of {product}s available: \"))\n", + " if quantity < 0:\n", + " print(\"**Error:** Quantity must be a non-negative whole number. Please try again.\")\n", + " continue\n", + " inventory[product] = quantity\n", + " break\n", + " except ValueError:\n", + " print(\"**Error:** Invalid input. Please enter a whole number for the quantity.\")\n", + " \n", " return inventory\n", "\n", "def get_customer_orders(inventory):\n", @@ -120,10 +131,24 @@ "def calculate_total_price(customer_orders):\n", " print(\"\\nCALCULATING TOTAL PRICE\")\n", "\n", - " product_prices = {\n", - " product: float(input(f\"Enter the price of {product}: \"))\n", - " for product in set(customer_orders)\n", - " }\n", + " product_prices = {}\n", + " \n", + " # Get unique products to ask for price only once\n", + " unique_products_ordered = set(customer_orders)\n", + "\n", + " for product in unique_products_ordered:\n", + " while True:\n", + " try:\n", + " # 2. Error handling for invalid price (non-numeric or negative)\n", + " price_input = input(f\"Enter the price of {product}: \")\n", + " price = float(price_input)\n", + " if price < 0:\n", + " print(\"**Error:** Price must be non-negative. Please try again.\")\n", + " continue\n", + " product_prices[product] = price\n", + " break\n", + " except ValueError:\n", + " print(\"**Error:** Invalid input. Please enter a valid number (e.g., 19.99) for the price.\")\n", " \n", " total_price = sum(product_prices[product] for product in customer_orders)\n", " \n",