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..4cec6e5 --- /dev/null +++ b/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb @@ -0,0 +1,255 @@ +{ + "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": 4, + "id": "b9435dbc-0589-4d23-b868-7df32e05aecf", + "metadata": {}, + "outputs": [], + "source": [ + "products = ['book', 'mug', 'hat']\n", + "\n", + "inventory = {\n", + " 'book': 10,\n", + " 'mug': 20,\n", + " 'hat': 0\n", + "}\n", + "\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" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "id": "3f7141ff-fb18-48ed-b339-43a7ccc876a2", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "How much is the book? 200\n", + "How much is the mug? 100\n" + ] + }, + { + "data": { + "text/plain": [ + "300" + ] + }, + "execution_count": 5, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "def calculate_price (customer_orders):\n", + " price_list = []\n", + " for product in customer_orders:\n", + " valid_input = False\n", + " while not valid_input:\n", + " try:\n", + " price = int(input(f'How much is the {product}?'))\n", + " if price <= 0:\n", + " raise ValueError(\"Invalid price! Please enter a non-negative value.\")\n", + " valid_input = True\n", + " except ValueError as error:\n", + " print ('bad input', error)\n", + " price_list.append(price) \n", + " return sum(price_list)\n", + "\n", + "calculate_price({'book', 'mug'})" + ] + }, + { + "cell_type": "code", + "execution_count": 6, + "id": "b458910e-c847-4e6a-b31c-c84b3b514442", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the number of customer orders: 2\n", + "Enter the name of a product that a customer wants to order: book\n", + "Enter the name of a product that a customer wants to order: hat\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "You made a mistake: hat is out of stock\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the name of a product that a customer wants to order: mug\n" + ] + }, + { + "data": { + "text/plain": [ + "{'book', 'mug'}" + ] + }, + "execution_count": 6, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "def get_customer_orders(inventory):\n", + " result = set()\n", + " valid_unit = False\n", + " while not valid_unit:\n", + " try:\n", + " unit = int(input('Enter the number of customer orders: '))\n", + " if unit < 0:\n", + " raise ValueError(\"Invalid unit! Please enter a non-negative value.\")\n", + " valid_unit = True\n", + " except ValueError as error:\n", + " print ('bad input', error)\n", + "\n", + " for i in range(int(unit)):\n", + " \n", + " valid_product = False\n", + " while not valid_product:\n", + " try:\n", + " product = input('Enter the name of a product that a customer wants to order: ')\n", + " if product not in inventory:\n", + " raise ValueError(f\"There is no such a {product}\")\n", + " elif inventory[product] == 0:\n", + " raise ValueError(f\"{product} is out of stock\")\n", + " else:\n", + " valid_product = True\n", + " result.add(product)\n", + " except ValueError as error:\n", + " print('You made a mistake:', error)\n", + " \n", + " return (result)\n", + "\n", + "get_customer_orders(inventory)" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "id": "30809f93-333f-4fa4-830f-13b15bcaa052", + "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": "3.13.5" + } + }, + "nbformat": 4, + "nbformat_minor": 5 +} diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb index f4c6ef6..4cec6e5 100644 --- a/lab-python-error-handling.ipynb +++ b/lab-python-error-handling.ipynb @@ -72,6 +72,163 @@ "\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": 4, + "id": "b9435dbc-0589-4d23-b868-7df32e05aecf", + "metadata": {}, + "outputs": [], + "source": [ + "products = ['book', 'mug', 'hat']\n", + "\n", + "inventory = {\n", + " 'book': 10,\n", + " 'mug': 20,\n", + " 'hat': 0\n", + "}\n", + "\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" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "id": "3f7141ff-fb18-48ed-b339-43a7ccc876a2", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "How much is the book? 200\n", + "How much is the mug? 100\n" + ] + }, + { + "data": { + "text/plain": [ + "300" + ] + }, + "execution_count": 5, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "def calculate_price (customer_orders):\n", + " price_list = []\n", + " for product in customer_orders:\n", + " valid_input = False\n", + " while not valid_input:\n", + " try:\n", + " price = int(input(f'How much is the {product}?'))\n", + " if price <= 0:\n", + " raise ValueError(\"Invalid price! Please enter a non-negative value.\")\n", + " valid_input = True\n", + " except ValueError as error:\n", + " print ('bad input', error)\n", + " price_list.append(price) \n", + " return sum(price_list)\n", + "\n", + "calculate_price({'book', 'mug'})" + ] + }, + { + "cell_type": "code", + "execution_count": 6, + "id": "b458910e-c847-4e6a-b31c-c84b3b514442", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the number of customer orders: 2\n", + "Enter the name of a product that a customer wants to order: book\n", + "Enter the name of a product that a customer wants to order: hat\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "You made a mistake: hat is out of stock\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the name of a product that a customer wants to order: mug\n" + ] + }, + { + "data": { + "text/plain": [ + "{'book', 'mug'}" + ] + }, + "execution_count": 6, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "def get_customer_orders(inventory):\n", + " result = set()\n", + " valid_unit = False\n", + " while not valid_unit:\n", + " try:\n", + " unit = int(input('Enter the number of customer orders: '))\n", + " if unit < 0:\n", + " raise ValueError(\"Invalid unit! Please enter a non-negative value.\")\n", + " valid_unit = True\n", + " except ValueError as error:\n", + " print ('bad input', error)\n", + "\n", + " for i in range(int(unit)):\n", + " \n", + " valid_product = False\n", + " while not valid_product:\n", + " try:\n", + " product = input('Enter the name of a product that a customer wants to order: ')\n", + " if product not in inventory:\n", + " raise ValueError(f\"There is no such a {product}\")\n", + " elif inventory[product] == 0:\n", + " raise ValueError(f\"{product} is out of stock\")\n", + " else:\n", + " valid_product = True\n", + " result.add(product)\n", + " except ValueError as error:\n", + " print('You made a mistake:', error)\n", + " \n", + " return (result)\n", + "\n", + "get_customer_orders(inventory)" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "id": "30809f93-333f-4fa4-830f-13b15bcaa052", + "metadata": {}, + "outputs": [], + "source": [] } ], "metadata": { @@ -90,7 +247,7 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.9.13" + "version": "3.13.5" } }, "nbformat": 4,