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315 changes: 315 additions & 0 deletions .ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb
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{
"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": 20,
"id": "ba8b09cf-fbe5-4580-9a75-3bb7c8bd539e",
"metadata": {},
"outputs": [
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the quantity of t-shirts available: 10\n",
"Enter the quantity of mugs available: 11\n",
"Enter the quantity of hats available: 12\n",
"Enter the quantity of books available: 13\n",
"Enter the quantity of keychains available: 14\n"
]
}
],
"source": [
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
"inventory = initialize_inventory(products)"
]
},
{
"cell_type": "code",
"execution_count": 21,
"id": "3cd6470c-357b-4fbf-8710-1b20eb3964b2",
"metadata": {},
"outputs": [],
"source": [
"def initialize_inventory(products):\n",
" inventory = {}\n",
" for item in products:\n",
" valid_quantity = False\n",
" while not valid_quantity:\n",
" try:\n",
" quantity = int(input(f\"Enter the quantity of {item}s available: \"))\n",
" if quantity < 0:\n",
" raise ValueError(\"Quantity cannot be negative. Please enter a valid quantity.\")\n",
" inventory[item] = quantity\n",
" valid_quantity = True\n",
" except ValueError as error:\n",
" print(f\"Error: {error}. Please enter a valid number.\")\n",
" return inventory"
]
},
{
"cell_type": "code",
"execution_count": 22,
"id": "24935485-d879-40ec-94e2-abdc67adc479",
"metadata": {},
"outputs": [],
"source": [
"def total_price(customer_orders):\n",
" prices = []\n",
" for order in customer_orders:\n",
" valid_price = False\n",
" while not valid_price:\n",
" try:\n",
" price = float(input(f\"Enter the price of {order}: \"))\n",
" if price < 0:\n",
" raise ValueError(\"Price cannot be negative.\")\n",
" prices.append(price)\n",
" valid_price = True\n",
" except ValueError as error:\n",
" print(f\"Invalid input: {error} Please enter a valid numeric price.\")\n",
" \n",
" total = sum(prices)\n",
" print(f\"Total price of products are: {total}\")\n",
" return total"
]
},
{
"cell_type": "code",
"execution_count": 23,
"id": "fb57dad2-2afa-4142-bad2-650642dca32b",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders(inventory):\n",
" customer_orders = set()\n",
" add_another_product = \"yes\"\n",
" \n",
" while add_another_product == \"yes\":\n",
" valid_order = False\n",
" while not valid_order:\n",
" try:\n",
" x = input(\"Input order product name: \").strip()\n",
" \n",
" # Check if product exists in inventory\n",
" if x not in inventory:\n",
" raise KeyError(f\"'{x}' is not available in the inventory.\")\n",
" \n",
" # Check if product is out of stock\n",
" if inventory[x] <= 0:\n",
" raise ValueError(f\"Sorry, '{x}' is currently out of stock.\")\n",
" \n",
" customer_orders.add(x)\n",
" valid_order = True\n",
" except (KeyError, ValueError) as error:\n",
" print(f\"Error: {error}. Please choose a valid product from the inventory.\")\n",
" \n",
" add_another_product = input(\"Do you want to add another product? (yes/no): \").strip().lower()\n",
" \n",
" return customer_orders"
]
},
{
"cell_type": "code",
"execution_count": 24,
"id": "3a616599-0d6c-4a5e-98fb-a1d9bdccb8ae",
"metadata": {},
"outputs": [
{
"name": "stdin",
"output_type": "stream",
"text": [
"Input order product name: hat\n",
"Do you want to add another product? (yes/no): yes\n",
"Input order product name: mug\n",
"Do you want to add another product? (yes/no): no\n"
]
}
],
"source": [
"customer_orders = get_customer_orders(inventory)"
]
},
{
"cell_type": "code",
"execution_count": 25,
"id": "81922add-f2fe-40e1-b080-30a45b94d675",
"metadata": {},
"outputs": [],
"source": [
"def update_inventory(customer_orders, inventory):\n",
" for item in customer_orders:\n",
" if item in inventory:\n",
" inventory[item] = inventory[item] - 1\n",
" return inventory"
]
},
{
"cell_type": "code",
"execution_count": 26,
"id": "ecba47d9-f7be-4b7c-97e0-301f17efbe42",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Order Statistics:\n",
"Total Products Ordered:2\n",
"Percentage of Products Ordered:40.0\n",
"{'t-shirt': 10, 'mug': 10, 'hat': 11, 'book': 13, 'keychain': 14}\n",
"dict_items([('t-shirt', 10), ('mug', 10), ('hat', 11), ('book', 13), ('keychain', 14)])\n",
"dict_keys(['t-shirt', 'mug', 'hat', 'book', 'keychain'])\n",
"dict_values([10, 10, 11, 13, 14])\n",
"('t-shirt', 10)\n",
"('mug', 10)\n",
"('hat', 11)\n",
"('book', 13)\n",
"('keychain', 14)\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the price of hat: 2\n",
"Enter the price of mug: 4\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Total price of products are: 6.0\n"
]
},
{
"data": {
"text/plain": [
"6.0"
]
},
"execution_count": 26,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"# Step A: Update the inventory quantities based on customer orders\n",
"update_inventory(customer_orders, inventory)\n",
"\n",
"# Step B: Calculate order statistics\n",
"order_status = calculate_order_statistics(customer_orders, products)\n",
"\n",
"# Step C: Print order statistics\n",
"print_order_statistics(order_status)\n",
"\n",
"# Step D: Print the updated inventory details\n",
"print_updated_inventory(inventory)\n",
"\n",
"# Step E: Calculate and print the total price (using your enhanced total_price function with error handling)\n",
"total_price(customer_orders)"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "cccf40b3-b5f8-4d43-8a25-7d84cfa5a365",
"metadata": {},
"outputs": [],
"source": []
}
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