From 239257669d7ff2fd0684ae1800545494ab182b96 Mon Sep 17 00:00:00 2001 From: AnaP2020 Date: Mon, 18 May 2026 14:07:26 +0100 Subject: [PATCH] Lab error handling done --- lab-python-error-handling.ipynb | 280 ++++++++++++++++++++++++++++++++ 1 file changed, 280 insertions(+) create mode 100644 lab-python-error-handling.ipynb diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb new file mode 100644 index 0000000..0539f32 --- /dev/null +++ b/lab-python-error-handling.ipynb @@ -0,0 +1,280 @@ +{ + "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": 3, + "id": "1ba4db8c", + "metadata": {}, + "outputs": [], + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]" + ] + }, + { + "cell_type": "code", + "execution_count": 4, + "id": "0591e99b", + "metadata": {}, + "outputs": [], + "source": [ + "def initialize_inventory(products):\n", + " inventory = {}\n", + " for product in products:\n", + " while True:\n", + " try:\n", + " quantity = int(input(f\"Enter the quantity of {product}s available: \"))\n", + " if quantity >= 0:\n", + " inventory[product] = quantity\n", + " break\n", + " else:\n", + " print(\"Quantity cannot be negative. Please enter a non-negative number.\")\n", + " except ValueError:\n", + " print(\"Invalid input. Please enter a valid number for the quantity.\")\n", + " formatted_items = [f\"Enter the quantity of {product}s available: {quantity}\" for product, quantity in inventory.items()]\n", + " for item in formatted_items:\n", + " print(item)\n", + " return inventory" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "id": "1060e123", + "metadata": {}, + "outputs": [], + "source": [ + "def get_customer_orders(inventory):\n", + " num_orders = []\n", + " while True:\n", + " try:\n", + " num_orders_input = int(input(\"Enter the number of products you wish to order: \"))\n", + " if num_orders_input >= 0:\n", + " num_orders = num_orders_input\n", + " break\n", + " else:\n", + " print(\"Please enter a valide number.\")\n", + " except ValueError:\n", + " print(\"Invalid input. Please enter a number for the number of products.\")\n", + " print(f\"Enter the number of customer orders: {num_orders}\")\n", + " orders = set()\n", + " while len(orders) < num_orders:\n", + " try:\n", + " order = input(f\"Enter product name {len(orders)+1}: \")\n", + " if order not in inventory:\n", + " print(\"The product is not available in the inventory.\")\n", + " elif inventory[order] <= 0:\n", + " print(\"The product is out of stock.\")\n", + " else:\n", + " orders.add(order)\n", + " except ValueError:\n", + " print(\"Invalid input. Please enter a valid product name.\")\n", + " formatted_orders = [f\"Enter the name of a product that a customer wants to order: {order}\" for order in sorted(orders)]\n", + " for order in formatted_orders:\n", + " print(order)\n", + " return orders" + ] + }, + { + "cell_type": "code", + "execution_count": 6, + "id": "c185d4ec", + "metadata": {}, + "outputs": [], + "source": [ + "def calculate_order_total_price(customer_orders):\n", + " prices = []\n", + "\n", + " while len(prices) < len(customer_orders):\n", + " try:\n", + " for order in customer_orders:\n", + " if len(prices) < len(customer_orders):\n", + " price = float(input(f\"Enter the price of {order}: \"))\n", + " if price <= 0:\n", + " print(\"Invalid input. Please enter a valid number price.\")\n", + " else:\n", + " prices.append(price)\n", + " except ValueError:\n", + " print(\"Invalid input. Please enter a valid number price.\")\n", + "\n", + " for order, price in zip(customer_orders, prices):\n", + " print(f\"The price of {order}: {price}\")\n", + "\n", + " total_price = sum(prices)\n", + " print(f\"Total price: {total_price:.2f}\")\n", + " \n", + " return total_price" + ] + }, + { + "cell_type": "code", + "execution_count": 8, + "id": "6f4c99a7", + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: 10\n", + "Enter the quantity of mugs available: 10\n", + "Enter the quantity of hats available: 10\n", + "Enter the quantity of books available: 0\n", + "Enter the quantity of keychains available: 2\n" + ] + } + ], + "source": [ + "inventory = initialize_inventory(products)" + ] + }, + { + "cell_type": "code", + "execution_count": 9, + "id": "a26e77eb", + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid input. Please enter a number for the number of products.\n", + "Please enter a valide number.\n", + "Enter the number of customer orders: 2\n", + "The product is out of stock.\n", + "Enter the name of a product that a customer wants to order: hat\n", + "Enter the name of a product that a customer wants to order: mug\n" + ] + } + ], + "source": [ + "customer_orders = get_customer_orders(inventory)" + ] + }, + { + "cell_type": "code", + "execution_count": 10, + "id": "b80afb3c", + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid input. Please enter a valid number price.\n", + "Invalid input. Please enter a valid number price.\n", + "The price of mug: 10.28\n", + "The price of hat: 25.54\n", + "Total price: 35.82\n" + ] + }, + { + "data": { + "text/plain": [ + "35.82" + ] + }, + "execution_count": 10, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "calculate_order_total_price(customer_orders)" + ] + } + ], + "metadata": { + "kernelspec": { + "display_name": "base", + "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": "3.13.9" + } + }, + "nbformat": 4, + "nbformat_minor": 5 +}