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..f4c6ef6 --- /dev/null +++ b/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb @@ -0,0 +1,98 @@ +{ + "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" + ] + } + ], + "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 +} diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb index f4c6ef6..caf813f 100644 --- a/lab-python-error-handling.ipynb +++ b/lab-python-error-handling.ipynb @@ -72,6 +72,251 @@ "\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": 11, + "id": "60831e74-f68e-4c91-a0c1-e3941e297c6d", + "metadata": {}, + "outputs": [], + "source": [ + "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" + ] + }, + { + "cell_type": "markdown", + "id": "d16087c2-ca85-4329-ad8c-01775c74281e", + "metadata": {}, + "source": [ + "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." + ] + }, + { + "cell_type": "code", + "execution_count": 12, + "id": "7d1575bd-e87f-4ac3-ba1d-8866baafb52e", + "metadata": {}, + "outputs": [], + "source": [ + "def calculate_total_price(customer_orders):\n", + " total_price = 0\n", + " for product in customer_orders:\n", + " valid_price = False\n", + " while not valid_price:\n", + " try:\n", + " price = float(input(f\"Enter the price of {product}: \"))\n", + " if price < 0:\n", + " raise ValueError(\"Price cannot be negative.\")\n", + " total_price += price\n", + " valid_price = True\n", + " except ValueError as error:\n", + " print(f\"Error: {error}. Please enter a valid non-negative number.\")\n", + " return total_price" + ] + }, + { + "cell_type": "markdown", + "id": "e2bb175b-ee24-4d01-96ac-209dc40927ab", + "metadata": {}, + "source": [ + "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" + ] + }, + { + "cell_type": "code", + "execution_count": 13, + "id": "70724991-6c8a-42f8-abcd-335a0dd95892", + "metadata": {}, + "outputs": [], + "source": [ + "def get_customer_orders(inventory):\n", + " customer_orders = set()\n", + "\n", + " valid_count = False\n", + " while not valid_count:\n", + " try:\n", + " num_orders = int(input(\"Enter the number of customer orders: \"))\n", + " if num_orders >= 0:\n", + " valid_count = True\n", + " else:\n", + " print(\"Invalid input! Please enter a non-negative number.\")\n", + " except ValueError:\n", + " print(\"Invalid input! Please enter a valid number.\")\n", + "\n", + " while len(customer_orders) < num_orders:\n", + " product = input(f\"Enter product {len(customer_orders) + 1} of {num_orders}: \").strip().lower()\n", + "\n", + " if product not in inventory:\n", + " print(f\"Error: '{product}' is not in the inventory. Please try again.\")\n", + " elif inventory[product] <= 0:\n", + " print(f\"Error: '{product}' is out of stock. Please try again.\")\n", + " else:\n", + " customer_orders.add(product)\n", + "\n", + " return customer_orders" + ] + }, + { + "cell_type": "markdown", + "id": "0dafacce-274f-4f6c-8858-8cecfd24da2b", + "metadata": {}, + "source": [ + "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." + ] + }, + { + "cell_type": "code", + "execution_count": 14, + "id": "ea881212-b719-4985-87d7-e402ef9978c0", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: -5\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Quantity cannot be negative. Please enter a valid quantity.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the quantity of t-shirts available: 0\n", + "Enter the quantity of mugs available: 2\n", + "Enter the quantity of hats available: 0\n", + "Enter the quantity of books available: 2\n", + "Enter the quantity of keychains available: 3\n", + "Enter the number of customer orders: 2\n", + "Enter product 1 of 2: hi\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: 'hi' is not in the inventory. Please try again.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter product 1 of 2: t-shirts\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: 't-shirts' is not in the inventory. Please try again.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter product 1 of 2: t-shirt\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: 't-shirt' is out of stock. Please try again.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter product 1 of 2: MUG\n", + "Enter product 2 of 2: hat\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: 'hat' is out of stock. Please try again.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter product 2 of 2: keychain\n", + "Enter the price of keychain: -8\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Error: Price cannot be negative.. Please enter a valid non-negative number.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "Enter the price of keychain: 15.99\n", + "Enter the price of mug: 8.99\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Total Price: 24.98\n" + ] + } + ], + "source": [ + "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n", + "\n", + "inventory = initialize_inventory(products)\n", + "\n", + "customer_orders = get_customer_orders(inventory)\n", + "\n", + "total_price = calculate_total_price(customer_orders)\n", + "\n", + "print(f\"\\nTotal Price: {total_price: }\")" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "id": "568bfb70-0bef-48b9-aca5-74f1039b4038", + "metadata": {}, + "outputs": [], + "source": [] } ], "metadata": { @@ -90,7 +335,7 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.9.13" + "version": "3.14.7" } }, "nbformat": 4,