From 3a7ea79f65f6fe2f944d91a62e42c9ea4bcf2a26 Mon Sep 17 00:00:00 2001 From: angelica Date: Tue, 18 Aug 2026 08:19:58 +0200 Subject: [PATCH] Lab Solved --- lab-python-error-handling.ipynb | 388 ++++++++++++++++++++++++-------- 1 file changed, 292 insertions(+), 96 deletions(-) diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb index f4c6ef6..edb5b08 100644 --- a/lab-python-error-handling.ipynb +++ b/lab-python-error-handling.ipynb @@ -1,98 +1,294 @@ { - "cells": [ - { - "cell_type": "markdown", - "id": "25d7736c-ba17-4aff-b6bb-66eba20fbf4e", - "metadata": {}, - "source": [ - "# Lab | Error Handling" - ] + "cells": [ + { + "cell_type": "markdown", + "id": "25d7736c-ba17-4aff-b6bb-66eba20fbf4e", + "metadata": { + "id": "25d7736c-ba17-4aff-b6bb-66eba20fbf4e" + }, + "source": [ + "# Lab | Error Handling" + ] + }, + { + "cell_type": "markdown", + "id": "bc99b386-7508-47a0-bcdb-d969deaf6c8b", + "metadata": { + "id": "bc99b386-7508-47a0-bcdb-d969deaf6c8b" + }, + "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", + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n", + "\n", + "\n", + "def create_inventory(products):\n", + " \"\"\"Ask the user for the initial quantity of each product.\"\"\"\n", + " inventory = {}\n", + "\n", + " for product in products:\n", + " while True:\n", + " try:\n", + " quantity = int(input(f\"Enter quantity for {product}: \"))\n", + "\n", + " if quantity < 0:\n", + " raise ValueError(\"Quantity cannot be negative\")\n", + "\n", + " inventory[product] = quantity\n", + " break\n", + "\n", + " except ValueError as error:\n", + " print(f\"Invalid quantity: {error}. Please enter a whole number.\")\n", + "\n", + " return inventory\n", + "\n", + "\n", + "def get_customer_orders(inventory):\n", + " \"\"\"Ask how many products the customer wants and validate each order.\"\"\"\n", + " while True:\n", + " try:\n", + " number_of_orders = int(\n", + " input(\"How many different products would you like to order? \")\n", + " )\n", + "\n", + " if number_of_orders < 0:\n", + " raise ValueError(\"The number of orders cannot be negative\")\n", + "\n", + " available_products = sum(\n", + " 1 for quantity in inventory.values() if quantity > 0\n", + " )\n", + "\n", + " if number_of_orders > available_products:\n", + " raise ValueError(\n", + " f\"Only {available_products} different products are available\"\n", + " )\n", + "\n", + " break\n", + "\n", + " except ValueError as error:\n", + " print(f\"Invalid number of orders: {error}.\")\n", + "\n", + " customer_orders = set()\n", + "\n", + " while len(customer_orders) < number_of_orders:\n", + " try:\n", + " order = input(\n", + " f\"Enter product {len(customer_orders) + 1}: \"\n", + " ).strip().lower()\n", + "\n", + " if order not in inventory:\n", + " raise ValueError(f\"'{order}' is not a valid product\")\n", + "\n", + " if inventory[order] <= 0:\n", + " raise ValueError(f\"'{order}' is out of stock\")\n", + "\n", + " if order in customer_orders:\n", + " raise ValueError(f\"'{order}' has already been ordered\")\n", + "\n", + " customer_orders.add(order)\n", + "\n", + " except ValueError as error:\n", + " print(f\"Invalid product: {error}. Please try again.\")\n", + "\n", + " return customer_orders\n", + "\n", + "\n", + "def calculate_total_price(customer_orders):\n", + " \"\"\"Ask for and validate the price of every ordered product.\"\"\"\n", + " total_price = 0\n", + "\n", + " for product in customer_orders:\n", + " while True:\n", + " try:\n", + " price = float(input(f\"Enter the price for {product}: €\"))\n", + "\n", + " if price < 0:\n", + " raise ValueError(\"Price cannot be negative\")\n", + "\n", + " total_price += price\n", + " break\n", + "\n", + " except ValueError as error:\n", + " print(f\"Invalid price: {error}. Please enter a valid number.\")\n", + "\n", + " return total_price\n", + "\n", + "\n", + "def update_inventory(customer_orders, inventory):\n", + " \"\"\"Remove one unit of every ordered product from the inventory.\"\"\"\n", + " for product in customer_orders:\n", + " inventory[product] -= 1\n", + "\n", + "\n", + "def display_order_statistics(customer_orders, products):\n", + " \"\"\"Calculate and display statistics about the order.\"\"\"\n", + " total_products_ordered = len(customer_orders)\n", + " percentage_ordered = (\n", + " total_products_ordered / len(products)\n", + " ) * 100\n", + "\n", + " print(\"\\nOrder Statistics:\")\n", + " print(\"Total Products Ordered:\", total_products_ordered)\n", + " print(f\"Percentage of Products Ordered: {percentage_ordered:.0f}%\")\n", + "\n", + "\n", + "def display_inventory(inventory):\n", + " \"\"\"Display the remaining inventory.\"\"\"\n", + " print(\"\\nUpdated Inventory:\")\n", + "\n", + " for product, quantity in inventory.items():\n", + " print(f\"{product}: {quantity}\")\n", + "\n", + "\n", + "# Main program\n", + "inventory = create_inventory(products)\n", + "\n", + "customer_orders = get_customer_orders(inventory)\n", + "\n", + "total_price = calculate_total_price(customer_orders)\n", + "\n", + "update_inventory(customer_orders, inventory)\n", + "\n", + "print(\"\\nCustomer Orders:\", customer_orders)\n", + "\n", + "display_order_statistics(customer_orders, products)\n", + "\n", + "print(f\"Total Price: €{total_price:.2f}\")\n", + "\n", + "display_inventory(inventory)" + ], + "metadata": { + "colab": { + "base_uri": "https://localhost:8080/" + }, + "id": "Ssm8XBmIgC0F", + "outputId": "b4033924-55ea-4d5e-919c-d475bce278ea" + }, + "id": "Ssm8XBmIgC0F", + "execution_count": 1, + "outputs": [ + { + "output_type": "stream", + "name": "stdout", + "text": [ + "Enter quantity for t-shirt: 7\n", + "Enter quantity for mug: 5\n", + "Enter quantity for hat: 7\n", + "Enter quantity for book: 8\n", + "Enter quantity for keychain: 9\n", + "How many different products would you like to order? 4\n", + "Enter product 1: mug\n", + "Enter product 2: hat\n", + "Enter product 3: book\n", + "Enter product 4: t-shit\n", + "Invalid product: 't-shit' is not a valid product. Please try again.\n", + "Enter product 4: t-shirt\n", + "Enter the price for t-shirt: €10\n", + "Enter the price for hat: €3\n", + "Enter the price for book: €7\n", + "Enter the price for mug: €3\n", + "\n", + "Customer Orders: {'t-shirt', 'hat', 'book', 'mug'}\n", + "\n", + "Order Statistics:\n", + "Total Products Ordered: 4\n", + "Percentage of Products Ordered: 80%\n", + "Total Price: €23.00\n", + "\n", + "Updated Inventory:\n", + "t-shirt: 6\n", + "mug: 4\n", + "hat: 6\n", + "book: 7\n", + "keychain: 9\n" + ] + } + ] + } + ], + "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": "3.9.13" + }, + "colab": { + "provenance": [] + } }, - { - "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" - ] - } - ], - "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": "3.9.13" - } - }, - "nbformat": 4, - "nbformat_minor": 5 -} + "nbformat": 4, + "nbformat_minor": 5 +} \ No newline at end of file