From 1662d803a0e2f885d7722de20b81d6f38ca95e11 Mon Sep 17 00:00:00 2001 From: Ofelia Date: Sun, 22 Feb 2026 21:48:22 +0100 Subject: [PATCH] Solved Lab_Error Handling --- ...lab-python-error-handling-checkpoint.ipynb | 309 ++++++++++++++++++ lab-python-error-handling.ipynb | 217 +++++++++++- 2 files changed, 523 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..0bfe2c6 --- /dev/null +++ b/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb @@ -0,0 +1,309 @@ +{ + "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": 34, + "id": "29f17f4f-86ee-4924-bd85-fbb343e90c89", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: -5\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Invalid quantity! Please enter a non-negative value.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: 3\n", + "Enter the quantity of mugs available: 5\n", + "Enter the quantity of hats available: 6\n", + "Enter the quantity of books available: 4\n", + "Enter the quantity of keychains available: 2\n" + ] + }, + { + "data": { + "text/plain": [ + "{'t-shirt': 3, 'mug': 5, 'hat': 6, 'book': 4, 'keychain': 2}" + ] + }, + "execution_count": 34, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n", + "inventory = {}\n", + "def initialize_inventory(products):\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", + "initialize_inventory(products)" + ] + }, + { + "cell_type": "code", + "execution_count": 39, + "id": "44efb5a8-cdd4-41b0-b415-8f26472281bd", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the number of products to order: -4\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid input. Please enter a valid number.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the number of products to order: 2\n", + "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: shirt\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Product does not exist in inventory.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the name of a product that a customer wants to order: hat\n" + ] + }, + { + "data": { + "text/plain": [ + "{'hat', 'mug'}" + ] + }, + "execution_count": 39, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "def get_customer_orders(inventory):\n", + " while True:\n", + " try:\n", + " quantity = int(input(\"Enter the number of products to order: \"))\n", + " if quantity < 0:\n", + " raise ValueError(\"Quantity cannot be negative.\")\n", + " break\n", + " except ValueError:\n", + " print(\"Invalid input. Please enter a valid number.\")\n", + "\n", + " customer_orders = set()\n", + "\n", + " for i in range(quantity):\n", + " while True:\n", + " try:\n", + " product_name = input(\n", + " \"Enter the name of a product that a customer wants to order: \"\n", + " )\n", + "\n", + " if product_name not in inventory:\n", + " raise ValueError(\"Product does not exist in inventory.\")\n", + " if inventory[product_name] <= 0:\n", + " raise ValueError(\"Product is out of stock.\")\n", + "\n", + " customer_orders.add(product_name)\n", + " break\n", + "\n", + " except ValueError as e:\n", + " print(f\"Error: {e}\")\n", + "\n", + " return customer_orders\n", + "get_customer_orders(inventory)" + ] + }, + { + "cell_type": "code", + "execution_count": 17, + "id": "fa49f4b1-c33c-4893-ba1b-d5e4ba090de9", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the price for mug: 6\n", + "Enter the price for hat: -4\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid input. Please enter a valid non-negative number.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the price for hat: 5\n" + ] + }, + { + "data": { + "text/plain": [ + "11.0" + ] + }, + "execution_count": 17, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "def total_price(customer_orders):\n", + " total = 0.0\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\n", + " break\n", + " \n", + " except ValueError:\n", + " print(\"Invalid input. Please enter a valid number.\")\n", + "\n", + " return total\n", + "total_price(customer_orders)" + ] + } + ], + "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": "3.13.9" + } + }, + "nbformat": 4, + "nbformat_minor": 5 +} diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb index f4c6ef6..0bfe2c6 100644 --- a/lab-python-error-handling.ipynb +++ b/lab-python-error-handling.ipynb @@ -72,13 +72,224 @@ "\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": 34, + "id": "29f17f4f-86ee-4924-bd85-fbb343e90c89", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: -5\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Invalid quantity! Please enter a non-negative value.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: 3\n", + "Enter the quantity of mugs available: 5\n", + "Enter the quantity of hats available: 6\n", + "Enter the quantity of books available: 4\n", + "Enter the quantity of keychains available: 2\n" + ] + }, + { + "data": { + "text/plain": [ + "{'t-shirt': 3, 'mug': 5, 'hat': 6, 'book': 4, 'keychain': 2}" + ] + }, + "execution_count": 34, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n", + "inventory = {}\n", + "def initialize_inventory(products):\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", + "initialize_inventory(products)" + ] + }, + { + "cell_type": "code", + "execution_count": 39, + "id": "44efb5a8-cdd4-41b0-b415-8f26472281bd", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the number of products to order: -4\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid input. Please enter a valid number.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the number of products to order: 2\n", + "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: shirt\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Product does not exist in inventory.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the name of a product that a customer wants to order: hat\n" + ] + }, + { + "data": { + "text/plain": [ + "{'hat', 'mug'}" + ] + }, + "execution_count": 39, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "def get_customer_orders(inventory):\n", + " while True:\n", + " try:\n", + " quantity = int(input(\"Enter the number of products to order: \"))\n", + " if quantity < 0:\n", + " raise ValueError(\"Quantity cannot be negative.\")\n", + " break\n", + " except ValueError:\n", + " print(\"Invalid input. Please enter a valid number.\")\n", + "\n", + " customer_orders = set()\n", + "\n", + " for i in range(quantity):\n", + " while True:\n", + " try:\n", + " product_name = input(\n", + " \"Enter the name of a product that a customer wants to order: \"\n", + " )\n", + "\n", + " if product_name not in inventory:\n", + " raise ValueError(\"Product does not exist in inventory.\")\n", + " if inventory[product_name] <= 0:\n", + " raise ValueError(\"Product is out of stock.\")\n", + "\n", + " customer_orders.add(product_name)\n", + " break\n", + "\n", + " except ValueError as e:\n", + " print(f\"Error: {e}\")\n", + "\n", + " return customer_orders\n", + "get_customer_orders(inventory)" + ] + }, + { + "cell_type": "code", + "execution_count": 17, + "id": "fa49f4b1-c33c-4893-ba1b-d5e4ba090de9", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the price for mug: 6\n", + "Enter the price for hat: -4\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid input. Please enter a valid non-negative number.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the price for hat: 5\n" + ] + }, + { + "data": { + "text/plain": [ + "11.0" + ] + }, + "execution_count": 17, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "def total_price(customer_orders):\n", + " total = 0.0\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\n", + " break\n", + " \n", + " except ValueError:\n", + " print(\"Invalid input. Please enter a valid number.\")\n", + "\n", + " return total\n", + "total_price(customer_orders)" + ] } ], "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 +301,7 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.9.13" + "version": "3.13.9" } }, "nbformat": 4,