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379 changes: 378 additions & 1 deletion lab-python-error-handling.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,383 @@
"\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": null,
"id": "166ef48e-63f8-42d5-bfc8-3e338106fa5e",
"metadata": {},
"outputs": [],
"source": [
"# 1 - Define the function for initializing the inventory with error handling"
]
},
{
"cell_type": "code",
"execution_count": 34,
"id": "64682fae-1d2f-45f9-8a1e-457e5646720e",
"metadata": {},
"outputs": [
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the quantity of t-shirts available: 2\n",
"Enter the quantity of mugs available: 2\n",
"Enter the quantity of hats available: 2\n",
"Enter the quantity of books available: 2\n",
"Enter the quantity of keychains available: 2\n"
]
}
],
"source": [
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\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. Pleaase enter a valid quantity.\")\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid quantity in numbers.\")\n",
" return inventory\n",
"\n",
"inventory = initialize_inventory(products)\n",
"\n",
"\n",
"\n",
" "
]
},
{
"cell_type": "markdown",
"id": "65a1f8a5-f892-4b83-8f94-800449b20bc3",
"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."
]
},
{
"cell_type": "code",
"execution_count": 35,
"id": "738af7ae-302d-49d0-a685-b65a06c983c8",
"metadata": {},
"outputs": [
{
"name": "stdin",
"output_type": "stream",
"text": [
"How many different products would you like to order? 11\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"You can only order up to 5 different products (based on the stock).\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"How many different products would you like to order? 2\n",
"Enter product 1 name: maa\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"'maa' is not in list of products.\n",
"Please try again.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter product 1 name: mug\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Added 'mug' to your orders.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter product 2 name: t-shirt\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Added 't-shirt' to your orders.\n",
"Final Customer Orders: {'t-shirt', 'mug'}\n"
]
}
],
"source": [
"def get_customer_orders(products, inventory):\n",
" avaiable_products = [p for p in products if inventory.get(p, 0) > 0]\n",
" \n",
" while True:\n",
" try:\n",
" num_orders = int(input(\"How many different products would you like to order? \")) \n",
" if num_orders <= 0:\n",
" print(\"Number of products must be greater than zero.\")\n",
" continue\n",
" if num_orders > len(avaiable_products):\n",
" print(f\"You can only order up to {len(avaiable_products)} different products (based on the stock).\")\n",
" continue\n",
" break\n",
" \n",
" except ValueError:\n",
" print(\"Please enter a valid number.\")\n",
" \n",
" customer_orders = set()\n",
" \n",
" for i in range(num_orders):\n",
" while True:\n",
" try:\n",
" product_name = input(f\"Enter product {i + 1} name: \").strip().lower() \n",
" if not product_name:\n",
" raise ValueError(\"Product name cannot be empty.\")\n",
" if product_name not in products:\n",
" raise ValueError(f\"'{product_name}' is not in list of products.\")\n",
" if inventory.get(product_name, 0) <= 0:\n",
" raise ValueError(f\"'{product_name}' is currently out of stock.\")\n",
" if product_name in customer_orders:\n",
" print(f\"'{product_name}' is already in your orders. Please enter a different product.\")\n",
" continue\n",
"\n",
" customer_orders.add(product_name)\n",
" print(f\"Added '{product_name}' to your orders.\")\n",
" break\n",
" except ValueError as e:\n",
" print(e)\n",
" print(\"Please try again.\")\n",
"\n",
" return customer_orders\n",
" \n",
"customer_orders = get_customer_orders(products, inventory)\n",
"print(\"Final Customer Orders:\", customer_orders)"
]
},
{
"cell_type": "code",
"execution_count": 36,
"id": "0f798eb4-5ffc-469d-9f69-f6eb42782444",
"metadata": {},
"outputs": [],
"source": [
"def update_inventory(inventory, customer_orders):\n",
" updated_inventory = {\n",
" product: (inventory[product] - 1 if product in customer_orders and inventory[product] > 0 else inventory[product]) for product in inventory}\n",
" return updated_inventory\n",
"\n",
"updated_inventory = update_inventory(inventory, customer_orders)"
]
},
{
"cell_type": "code",
"execution_count": 37,
"id": "b050bea2-ffb0-4851-bfa5-4e7967414d83",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"the updated inventory: t-shirt: 1, mug: 1, hat: 2, book: 2, keychain: 2\n"
]
}
],
"source": [
"def print_updated_inventory (inventory):\n",
" formatted_inventory = \", \".join(f\"{product}: {quantity}\" for product, quantity in inventory.items())\n",
" print(\"the updated inventory:\", formatted_inventory)\n",
"\n",
"print_updated_inventory(updated_inventory)"
]
},
{
"cell_type": "markdown",
"id": "0a10a046-9501-4e7d-bfa2-a6f7307b5ba2",
"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": 39,
"id": "6fcbe531-faef-418f-8078-437df6f8a900",
"metadata": {},
"outputs": [
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the price for t-shirt: ff\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Invalid input. Please enter a valid price.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the price for t-shirt: -122\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Price cannot be negative. Please enter a valid price.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the price for t-shirt: 12\n",
"Enter the price for mug: 12\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Order prices: {'t-shirt': 12.0, 'mug': 12.0}\n",
"Total price: 24.0\n"
]
}
],
"source": [
"def get_order_prices(customer_orders):\n",
" prices = {}\n",
" total = 0.0\n",
" \n",
" for product in customer_orders:\n",
" valid_input = False\n",
" while not valid_input:\n",
" try:\n",
" price = float(input(f\"Enter the price for {product}: \"))\n",
" if price >= 0:\n",
" prices[product] = price\n",
" total += price\n",
" valid_input = True\n",
" else:\n",
" print(\"Price cannot be negative. Please enter a valid price.\")\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid price.\") \n",
" return prices, total\n",
"\n",
"prices, total = get_order_prices(customer_orders)\n",
"print(\"Order prices:\", prices)\n",
"print(\"Total price:\", round(total, 2))"
]
},
{
"cell_type": "code",
"execution_count": 40,
"id": "200ebd56-c86a-42bb-bd41-aac544b681ce",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The updated inventory: {'t-shirt': 1, 'mug': 1, 'hat': 2, 'book': 2, 'keychain': 2}\n"
]
}
],
"source": [
"def update_inventory(inventory, customer_orders):\n",
" for product in customer_orders:\n",
" if product in inventory and inventory[product] > 0:\n",
" inventory[product] -= 1\n",
" \n",
" updated_inventory = {product: quantity for product, quantity in inventory.items() if quantity > 0}\n",
" return updated_inventory\n",
"\n",
"updated_inventory = update_inventory(inventory, customer_orders)\n",
"print(\"The updated inventory:\", updated_inventory)\n"
]
},
{
"cell_type": "code",
"execution_count": 41,
"id": "0d8f8fa8-d3d0-4fbd-9233-37e6a5cf4b85",
"metadata": {},
"outputs": [],
"source": [
"def calculate_order_statistics(customer_orders, products):\n",
" total_products_order = len(customer_orders)\n",
" percentage = len(set(customer_orders)) / len(products) * 100\n",
" return total_products_order, percentage\n",
" \n",
"update_inventory(inventory, customer_orders)\n",
"total, percentage = calculate_order_statistics(customer_orders, products)\n"
]
},
{
"cell_type": "code",
"execution_count": 42,
"id": "d8ec46c3-b7a9-4061-b996-47275add186e",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The total products ordered: 2\n",
"The percentage of unique products ordered are: 40.0 %\n"
]
}
],
"source": [
"def print_order_statistics(order_statistics): \n",
" total, percentage = order_statistics\n",
" print(\"The total products ordered: \", total)\n",
" print(\"The percentage of unique products ordered are: \", round(percentage, 2),\"%\")\n",
" \n",
"order_statistics = calculate_order_statistics(customer_orders, products)\n",
"print_order_statistics(order_statistics)"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "8dc641b2-e073-45a6-b924-5648023df4b2",
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
Expand All @@ -90,7 +467,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.5"
}
},
"nbformat": 4,
Expand Down