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..2d28a51 --- /dev/null +++ b/.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb @@ -0,0 +1,339 @@ +{ + "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": 19, + "id": "867ce320-d598-482d-9669-e8fb74f931c6", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter the quantity of t-shirt: 0\n", + "please enter the quantity of mug: 4\n", + "please enter the quantity of hat: -1\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid quantity! Please enter a non-negative value.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter the quantity of hat: 6\n", + "please enter the quantity of book: 5\n", + "please enter the quantity of keychain: 9\n" + ] + }, + { + "data": { + "text/plain": [ + "{'t-shirt': 0, 'mug': 4, 'hat': 6, 'book': 5, 'keychain': 9}" + ] + }, + "execution_count": 19, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "products=[\"t-shirt\",\"mug\",\"hat\",\"book\",\"keychain\"]\n", + "\n", + "# def valid_quantity(product):\n", + "# is_q_valid=False\n", + "# while not is_q_valid:\n", + "# try:\n", + "# quantity=int(input(f\"please enter the quantity of {product}:\"))\n", + "# # if quantity < 0:\n", + "# # raise ValueError(\"Invalid quantity! Please enter a non-negative value.\")\n", + "# assert quantity > 0\n", + "# is_q_valid=True\n", + "# except ValueError:\n", + "# print(\"Invalid input. Please enter a valid quantity.\")\n", + "# except AssertionError:\n", + "# print(\"Invalid quantity! Please enter a non-negative value.\")\n", + "# return quantity\n", + "\n", + "def valid_value(product,attri):\n", + " is_valid=False\n", + " while not is_valid:\n", + " try:\n", + " if attri==\"quantity\":\n", + " value=int(input(f\"please enter the quantity of {product}:\"))\n", + " assert value>=0\n", + " elif attri==\"price\":\n", + " value=float(input(f\"please input the price of {product}:\"))\n", + " assert value>0\n", + " elif attri==\"order number\":\n", + " value=int(input(\"please enter how many orders you want to have:\"))\n", + " assert value>=0\n", + " elif attri==\"product name\":\n", + " value=input(\"please enter the product name that you want to buy:\").strip().lower()\n", + " if not(value in product):\n", + " raise ValueError\n", + " assert product[value] >0\n", + " else:\n", + " is_valid=True\n", + " value = None\n", + " raise AttributeError(f\"there is no {attri}, pease check your function\")\n", + " is_valid=True \n", + " except ValueError:\n", + " print(f\"Invalid input. Please enter a valid {attri}.\")\n", + " except AssertionError:\n", + " if attri==\"product name\":\n", + " print(f\"{value} is not available, please enter a new product.\")\n", + " elif attri==\"price\":\n", + " print(f\"Invalid {attri}! Please enter a value more than 0.\")\n", + " else:\n", + " print(f\"Invalid {attri}! Please enter a non-negative value.\")\n", + " return value\n", + " \n", + "def initialize_inventory(products_list:list) -> dict:\n", + " ini_inventory={product:valid_value(product,\"quantity\") for product in products_list}\n", + " return ini_inventory\n", + "\n", + "inventory=initialize_inventory(products)\n", + "inventory" + ] + }, + { + "cell_type": "code", + "execution_count": 27, + "id": "3f3500ec-8637-4ae4-8be9-68f8d20e00fa", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter how many orders you want to have: t-shirt\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid input. Please enter a valid order number.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter how many orders you want to have: 1\n", + "please enter the product name that you want to buy: t-shirt\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "t-shirtis not available, please enter a new product.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter the product name that you want to buy: mug\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "1\n" + ] + } + ], + "source": [ + "def get_customer_orders(products):\n", + " order_number=valid_value(products,\"order number\")\n", + " if order_number != 0:\n", + " customer_orders={valid_value(products,\"product name\") for i in range(order_number)}\n", + " else:\n", + " customer_orders=set()\n", + " return customer_orders\n", + " \n", + "customer_orders=get_customer_orders(inventory)\n", + "print(len(customer_orders))" + ] + }, + { + "cell_type": "code", + "execution_count": 28, + "id": "229b5858-02c5-4a65-b383-f47158a81e14", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please input the price of {'mug'}: -1\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid price! Please enter a value more than 0.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please input the price of {'mug'}: 0\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid price! Please enter a value more than 0.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please input the price of {'mug'}: 5\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "total price: 5.0\n" + ] + } + ], + "source": [ + "# def valid_price(product):\n", + "# is_price_valid=False\n", + "# while not is_price_valid:\n", + "# try:\n", + "# price=float(input(f\"please input the price of {product}:\"))\n", + "# assert quantity > 0\n", + "# is_q_valid=True\n", + "# except ValueError:\n", + "# print(\"Invalid input. Please enter a valid quantity.\")\n", + "# except AssertionError:\n", + "# print(\"Invalid price! Please enter a non-negative value.\")\n", + "\n", + "def calculate_price(products):\n", + " return sum(valid_value(products,\"price\") for i in products)\n", + "\n", + "print(\"total price:\",calculate_price(customer_orders))" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "id": "6ab59cff-35c9-4d47-85a8-49009f50dca1", + "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": "3.10.14" + } + }, + "nbformat": 4, + "nbformat_minor": 5 +} diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb index f4c6ef6..2d28a51 100644 --- a/lab-python-error-handling.ipynb +++ b/lab-python-error-handling.ipynb @@ -72,6 +72,247 @@ "\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": 19, + "id": "867ce320-d598-482d-9669-e8fb74f931c6", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter the quantity of t-shirt: 0\n", + "please enter the quantity of mug: 4\n", + "please enter the quantity of hat: -1\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid quantity! Please enter a non-negative value.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter the quantity of hat: 6\n", + "please enter the quantity of book: 5\n", + "please enter the quantity of keychain: 9\n" + ] + }, + { + "data": { + "text/plain": [ + "{'t-shirt': 0, 'mug': 4, 'hat': 6, 'book': 5, 'keychain': 9}" + ] + }, + "execution_count": 19, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "products=[\"t-shirt\",\"mug\",\"hat\",\"book\",\"keychain\"]\n", + "\n", + "# def valid_quantity(product):\n", + "# is_q_valid=False\n", + "# while not is_q_valid:\n", + "# try:\n", + "# quantity=int(input(f\"please enter the quantity of {product}:\"))\n", + "# # if quantity < 0:\n", + "# # raise ValueError(\"Invalid quantity! Please enter a non-negative value.\")\n", + "# assert quantity > 0\n", + "# is_q_valid=True\n", + "# except ValueError:\n", + "# print(\"Invalid input. Please enter a valid quantity.\")\n", + "# except AssertionError:\n", + "# print(\"Invalid quantity! Please enter a non-negative value.\")\n", + "# return quantity\n", + "\n", + "def valid_value(product,attri):\n", + " is_valid=False\n", + " while not is_valid:\n", + " try:\n", + " if attri==\"quantity\":\n", + " value=int(input(f\"please enter the quantity of {product}:\"))\n", + " assert value>=0\n", + " elif attri==\"price\":\n", + " value=float(input(f\"please input the price of {product}:\"))\n", + " assert value>0\n", + " elif attri==\"order number\":\n", + " value=int(input(\"please enter how many orders you want to have:\"))\n", + " assert value>=0\n", + " elif attri==\"product name\":\n", + " value=input(\"please enter the product name that you want to buy:\").strip().lower()\n", + " if not(value in product):\n", + " raise ValueError\n", + " assert product[value] >0\n", + " else:\n", + " is_valid=True\n", + " value = None\n", + " raise AttributeError(f\"there is no {attri}, pease check your function\")\n", + " is_valid=True \n", + " except ValueError:\n", + " print(f\"Invalid input. Please enter a valid {attri}.\")\n", + " except AssertionError:\n", + " if attri==\"product name\":\n", + " print(f\"{value} is not available, please enter a new product.\")\n", + " elif attri==\"price\":\n", + " print(f\"Invalid {attri}! Please enter a value more than 0.\")\n", + " else:\n", + " print(f\"Invalid {attri}! Please enter a non-negative value.\")\n", + " return value\n", + " \n", + "def initialize_inventory(products_list:list) -> dict:\n", + " ini_inventory={product:valid_value(product,\"quantity\") for product in products_list}\n", + " return ini_inventory\n", + "\n", + "inventory=initialize_inventory(products)\n", + "inventory" + ] + }, + { + "cell_type": "code", + "execution_count": 27, + "id": "3f3500ec-8637-4ae4-8be9-68f8d20e00fa", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter how many orders you want to have: t-shirt\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid input. Please enter a valid order number.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter how many orders you want to have: 1\n", + "please enter the product name that you want to buy: t-shirt\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "t-shirtis not available, please enter a new product.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please enter the product name that you want to buy: mug\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "1\n" + ] + } + ], + "source": [ + "def get_customer_orders(products):\n", + " order_number=valid_value(products,\"order number\")\n", + " if order_number != 0:\n", + " customer_orders={valid_value(products,\"product name\") for i in range(order_number)}\n", + " else:\n", + " customer_orders=set()\n", + " return customer_orders\n", + " \n", + "customer_orders=get_customer_orders(inventory)\n", + "print(len(customer_orders))" + ] + }, + { + "cell_type": "code", + "execution_count": 28, + "id": "229b5858-02c5-4a65-b383-f47158a81e14", + "metadata": {}, + "outputs": [ + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please input the price of {'mug'}: -1\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid price! Please enter a value more than 0.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please input the price of {'mug'}: 0\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Invalid price! Please enter a value more than 0.\n" + ] + }, + { + "name": "stdin", + "output_type": "stream", + "text": [ + "please input the price of {'mug'}: 5\n" + ] + }, + { + "name": "stdout", + "output_type": "stream", + "text": [ + "total price: 5.0\n" + ] + } + ], + "source": [ + "# def valid_price(product):\n", + "# is_price_valid=False\n", + "# while not is_price_valid:\n", + "# try:\n", + "# price=float(input(f\"please input the price of {product}:\"))\n", + "# assert quantity > 0\n", + "# is_q_valid=True\n", + "# except ValueError:\n", + "# print(\"Invalid input. Please enter a valid quantity.\")\n", + "# except AssertionError:\n", + "# print(\"Invalid price! Please enter a non-negative value.\")\n", + "\n", + "def calculate_price(products):\n", + " return sum(valid_value(products,\"price\") for i in products)\n", + "\n", + "print(\"total price:\",calculate_price(customer_orders))" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "id": "6ab59cff-35c9-4d47-85a8-49009f50dca1", + "metadata": {}, + "outputs": [], + "source": [] } ], "metadata": { @@ -90,7 +331,7 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.9.13" + "version": "3.10.14" } }, "nbformat": 4,