From 04c06d369be751d3c88ab0f42c127d760023afbb Mon Sep 17 00:00:00 2001 From: Jan Noel Vero Date: Thu, 23 Jul 2026 22:49:26 +0200 Subject: [PATCH] complete lab-python-error-handling --- ...lab-python-error-handling-checkpoint.ipynb | 434 ++++++++++++++++++ lab-python-error-handling.ipynb | 338 +++++++++++++- 2 files changed, 771 insertions(+), 1 deletion(-) 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..e46e52a --- /dev/null +++ b/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb @@ -0,0 +1,434 @@ +{ + "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": "a17cee49-b35e-46ed-9138-2c8c394bfc32", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: abc\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: invalid literal for int() with base 10: 'abc'\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: -3\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Quantity cannot be negative.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: abc\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: invalid literal for int() with base 10: 'abc'\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: -3\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Quantity cannot be negative.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: 3\n", + "Enter the quantity of mugs available: 4\n", + "Enter the quantity of hats available: 2\n", + "Enter the quantity of books available: 2\n", + "Enter the quantity of keychains available: 2\n", + "Enter the number of customer orders: 2\n", + "Enter the name of a product that a customer wants to order: 123\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Product not found in inventory.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the name of a product that a customer wants to order: coffe\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Product not found in inventory.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the name of a product that a customer wants to order: mug\n", + "Enter the name of a product that a customer wants to order: t-shirt\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: 2\n", + "mug: 3\n", + "hat: 2\n", + "book: 2\n", + "keychain: 2\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the price of mug: 10\n", + "Enter the price of t-shirt: 20\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Total Price: 30.0\n" + ] + } + ], + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n", + "\n", + "\n", + "def initialize_inventory(products):\n", + " inventory = {}\n", + "\n", + " for product in products:\n", + " valid_input = False\n", + "\n", + " while not valid_input:\n", + " try:\n", + " quantity = int(\n", + " input(f\"Enter the quantity of {product}s available: \")\n", + " )\n", + "\n", + " if quantity < 0:\n", + " raise ValueError(\n", + " \"Quantity cannot be negative.\"\n", + " )\n", + "\n", + " inventory[product] = quantity\n", + " valid_input = True\n", + "\n", + " except ValueError as error:\n", + " print(\"Error:\", error)\n", + "\n", + " return inventory\n", + "\n", + "\n", + "def get_customer_orders(inventory):\n", + " valid_input = False\n", + "\n", + " while not valid_input:\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(\n", + " \"Number of orders cannot be negative.\"\n", + " )\n", + "\n", + " valid_input = True\n", + "\n", + " except ValueError as error:\n", + " print(\"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(\n", + " \"Product not found in inventory.\"\n", + " )\n", + "\n", + " if inventory[product] <= 0:\n", + " raise ValueError(\n", + " \"Product is out of stock.\"\n", + " )\n", + "\n", + " customer_orders.add(product)\n", + " valid_product = True\n", + "\n", + " except ValueError as error:\n", + " print(\"Error:\", error)\n", + "\n", + " return customer_orders\n", + "\n", + "\n", + "def update_inventory(customer_orders, inventory):\n", + "\n", + " updated_inventory = {\n", + " product: quantity - 1\n", + " if product in customer_orders\n", + " else quantity\n", + " for product, quantity in inventory.items()\n", + " }\n", + "\n", + " updated_inventory = {\n", + " product: quantity\n", + " for product, quantity in updated_inventory.items()\n", + " if quantity > 0\n", + " }\n", + "\n", + " return updated_inventory\n", + "\n", + "\n", + "def calculate_order_statistics(customer_orders, products):\n", + "\n", + " total_products_ordered = len(customer_orders)\n", + "\n", + " percentage_unique_products = (\n", + " total_products_ordered / len(products)\n", + " ) * 100\n", + "\n", + " return total_products_ordered, percentage_unique_products\n", + "\n", + "\n", + "def print_order_statistics(order_statistics):\n", + "\n", + " total_products_ordered = order_statistics[0]\n", + " percentage_unique_products = order_statistics[1]\n", + "\n", + " print(\"\\nOrder Statistics:\")\n", + " print(\n", + " \"Total Products Ordered:\",\n", + " total_products_ordered\n", + " )\n", + "\n", + " print(\n", + " \"Percentage of Unique Products Ordered:\",\n", + " percentage_unique_products\n", + " )\n", + "\n", + "\n", + "def print_updated_inventory(inventory):\n", + "\n", + " print(\"\\nUpdated Inventory:\")\n", + "\n", + " for product, quantity in inventory.items():\n", + " print(f\"{product}: {quantity}\")\n", + "\n", + "\n", + "def calculate_total_price(customer_orders):\n", + "\n", + " prices = {}\n", + "\n", + " for product in customer_orders:\n", + " valid_price = False\n", + "\n", + " while not valid_price:\n", + " try:\n", + " price = float(\n", + " input(f\"Enter the price of {product}: \")\n", + " )\n", + "\n", + " if price < 0:\n", + " raise ValueError(\n", + " \"Price cannot be negative.\"\n", + " )\n", + "\n", + " prices[product] = price\n", + " valid_price = True\n", + "\n", + " except ValueError as error:\n", + " print(\"Error:\", error)\n", + "\n", + " total_price = sum(\n", + " price\n", + " for price in prices.values()\n", + " )\n", + "\n", + " return total_price\n", + "\n", + "\n", + "inventory = initialize_inventory(products)\n", + "\n", + "customer_orders = get_customer_orders(inventory)\n", + "\n", + "order_statistics = calculate_order_statistics(\n", + " customer_orders,\n", + " products\n", + ")\n", + "\n", + "print_order_statistics(order_statistics)\n", + "\n", + "inventory = update_inventory(\n", + " customer_orders,\n", + " inventory\n", + ")\n", + "\n", + "print_updated_inventory(inventory)\n", + "\n", + "total_price = calculate_total_price(\n", + " customer_orders\n", + ")\n", + "\n", + "print(\"\\nTotal Price:\", total_price)" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "id": "8fc1ede7-a300-452c-a15d-2b1610b12865", + "metadata": {}, + "outputs": [], + "source": [] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 3 (ipykernel)", + "language": "python", + "name": "python3" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 3 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython3", + "version": "3.13.14" + } + }, + "nbformat": 4, + "nbformat_minor": 5 +} diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb index f4c6ef6..e46e52a 100644 --- a/lab-python-error-handling.ipynb +++ b/lab-python-error-handling.ipynb @@ -72,6 +72,342 @@ "\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": "a17cee49-b35e-46ed-9138-2c8c394bfc32", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: abc\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: invalid literal for int() with base 10: 'abc'\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: -3\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Quantity cannot be negative.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: abc\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: invalid literal for int() with base 10: 'abc'\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: -3\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Quantity cannot be negative.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: 3\n", + "Enter the quantity of mugs available: 4\n", + "Enter the quantity of hats available: 2\n", + "Enter the quantity of books available: 2\n", + "Enter the quantity of keychains available: 2\n", + "Enter the number of customer orders: 2\n", + "Enter the name of a product that a customer wants to order: 123\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Product not found in inventory.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the name of a product that a customer wants to order: coffe\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Product not found in inventory.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the name of a product that a customer wants to order: mug\n", + "Enter the name of a product that a customer wants to order: t-shirt\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: 2\n", + "mug: 3\n", + "hat: 2\n", + "book: 2\n", + "keychain: 2\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the price of mug: 10\n", + "Enter the price of t-shirt: 20\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Total Price: 30.0\n" + ] + } + ], + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n", + "\n", + "\n", + "def initialize_inventory(products):\n", + " inventory = {}\n", + "\n", + " for product in products:\n", + " valid_input = False\n", + "\n", + " while not valid_input:\n", + " try:\n", + " quantity = int(\n", + " input(f\"Enter the quantity of {product}s available: \")\n", + " )\n", + "\n", + " if quantity < 0:\n", + " raise ValueError(\n", + " \"Quantity cannot be negative.\"\n", + " )\n", + "\n", + " inventory[product] = quantity\n", + " valid_input = True\n", + "\n", + " except ValueError as error:\n", + " print(\"Error:\", error)\n", + "\n", + " return inventory\n", + "\n", + "\n", + "def get_customer_orders(inventory):\n", + " valid_input = False\n", + "\n", + " while not valid_input:\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(\n", + " \"Number of orders cannot be negative.\"\n", + " )\n", + "\n", + " valid_input = True\n", + "\n", + " except ValueError as error:\n", + " print(\"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(\n", + " \"Product not found in inventory.\"\n", + " )\n", + "\n", + " if inventory[product] <= 0:\n", + " raise ValueError(\n", + " \"Product is out of stock.\"\n", + " )\n", + "\n", + " customer_orders.add(product)\n", + " valid_product = True\n", + "\n", + " except ValueError as error:\n", + " print(\"Error:\", error)\n", + "\n", + " return customer_orders\n", + "\n", + "\n", + "def update_inventory(customer_orders, inventory):\n", + "\n", + " updated_inventory = {\n", + " product: quantity - 1\n", + " if product in customer_orders\n", + " else quantity\n", + " for product, quantity in inventory.items()\n", + " }\n", + "\n", + " updated_inventory = {\n", + " product: quantity\n", + " for product, quantity in updated_inventory.items()\n", + " if quantity > 0\n", + " }\n", + "\n", + " return updated_inventory\n", + "\n", + "\n", + "def calculate_order_statistics(customer_orders, products):\n", + "\n", + " total_products_ordered = len(customer_orders)\n", + "\n", + " percentage_unique_products = (\n", + " total_products_ordered / len(products)\n", + " ) * 100\n", + "\n", + " return total_products_ordered, percentage_unique_products\n", + "\n", + "\n", + "def print_order_statistics(order_statistics):\n", + "\n", + " total_products_ordered = order_statistics[0]\n", + " percentage_unique_products = order_statistics[1]\n", + "\n", + " print(\"\\nOrder Statistics:\")\n", + " print(\n", + " \"Total Products Ordered:\",\n", + " total_products_ordered\n", + " )\n", + "\n", + " print(\n", + " \"Percentage of Unique Products Ordered:\",\n", + " percentage_unique_products\n", + " )\n", + "\n", + "\n", + "def print_updated_inventory(inventory):\n", + "\n", + " print(\"\\nUpdated Inventory:\")\n", + "\n", + " for product, quantity in inventory.items():\n", + " print(f\"{product}: {quantity}\")\n", + "\n", + "\n", + "def calculate_total_price(customer_orders):\n", + "\n", + " prices = {}\n", + "\n", + " for product in customer_orders:\n", + " valid_price = False\n", + "\n", + " while not valid_price:\n", + " try:\n", + " price = float(\n", + " input(f\"Enter the price of {product}: \")\n", + " )\n", + "\n", + " if price < 0:\n", + " raise ValueError(\n", + " \"Price cannot be negative.\"\n", + " )\n", + "\n", + " prices[product] = price\n", + " valid_price = True\n", + "\n", + " except ValueError as error:\n", + " print(\"Error:\", error)\n", + "\n", + " total_price = sum(\n", + " price\n", + " for price in prices.values()\n", + " )\n", + "\n", + " return total_price\n", + "\n", + "\n", + "inventory = initialize_inventory(products)\n", + "\n", + "customer_orders = get_customer_orders(inventory)\n", + "\n", + "order_statistics = calculate_order_statistics(\n", + " customer_orders,\n", + " products\n", + ")\n", + "\n", + "print_order_statistics(order_statistics)\n", + "\n", + "inventory = update_inventory(\n", + " customer_orders,\n", + " inventory\n", + ")\n", + "\n", + "print_updated_inventory(inventory)\n", + "\n", + "total_price = calculate_total_price(\n", + " customer_orders\n", + ")\n", + "\n", + "print(\"\\nTotal Price:\", total_price)" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "id": "8fc1ede7-a300-452c-a15d-2b1610b12865", + "metadata": {}, + "outputs": [], + "source": [] } ], "metadata": { @@ -90,7 +426,7 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.9.13" + "version": "3.13.14" } }, "nbformat": 4,