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Lab Submitted[Imtiaz Faruk] #288

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231 changes: 231 additions & 0 deletions lab-python-error-handling 2.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": null,
"id": "f8e836a5",
"metadata": {},
"outputs": [],
"source": [
"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"
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "f3196ec0",
"metadata": {},
"outputs": [],
"source": [
"def calculate_total_price(products):\n",
" prices = {}\n",
" for product in products:\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(\"Invalid price! Please enter a non-negative value.\")\n",
" valid_price = True\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
" prices[product] = price\n",
" return prices\n"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "0891242a",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders(inventory):\n",
" orders = {}\n",
" while True:\n",
" try:\n",
" num_orders = int(input(\"Enter the number of different products to order: \"))\n",
" if num_orders < 0:\n",
" raise ValueError(\"Invalid number! Please enter a non-negative value.\")\n",
" break\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
"\n",
" for _ in range(num_orders):\n",
" while True:\n",
" product_name = input(\"Enter the product name: \")\n",
" if product_name not in inventory:\n",
" print(\"Error: This product is not in the inventory. Please enter a valid product name.\")\n",
" continue\n",
"\n",
" if inventory[product_name] <= 0:\n",
" print(f\"Error: {product_name} is out of stock.\")\n",
" continue\n",
"\n",
" try:\n",
" quantity = int(input(f\"Enter the quantity for {product_name}: \"))\n",
" if quantity < 0:\n",
" raise ValueError(\"Invalid quantity! Please enter a non-negative value.\")\n",
" elif quantity > inventory[product_name]:\n",
" print(f\"Error: Only {inventory[product_name]} {product_name}s are available.\")\n",
" else:\n",
" orders[product_name] = quantity\n",
" inventory[product_name] -= quantity\n",
" break\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
"\n",
" return orders\n"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "fcdd7fb7",
"metadata": {},
"outputs": [
{
"ename": "TypeError",
"evalue": "list indices must be integers or slices, not str",
"output_type": "error",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[1;31mTypeError\u001b[0m Traceback (most recent call last)",
"Cell \u001b[1;32mIn[4], line 10\u001b[0m\n\u001b[0;32m 7\u001b[0m prices \u001b[38;5;241m=\u001b[39m calculate_total_price(products)\n\u001b[0;32m 9\u001b[0m \u001b[38;5;66;03m# Step 3: Get customer orders with error handling\u001b[39;00m\n\u001b[1;32m---> 10\u001b[0m orders \u001b[38;5;241m=\u001b[39m \u001b[43mget_customer_orders\u001b[49m\u001b[43m(\u001b[49m\u001b[43minventory\u001b[49m\u001b[43m)\u001b[49m\n\u001b[0;32m 12\u001b[0m \u001b[38;5;66;03m# Display final order summary\u001b[39;00m\n\u001b[0;32m 13\u001b[0m \u001b[38;5;28mprint\u001b[39m(\u001b[38;5;124m\"\u001b[39m\u001b[38;5;130;01m\\n\u001b[39;00m\u001b[38;5;124mOrder Summary:\u001b[39m\u001b[38;5;124m\"\u001b[39m)\n",
"Cell \u001b[1;32mIn[2], line 19\u001b[0m, in \u001b[0;36mget_customer_orders\u001b[1;34m(inventory)\u001b[0m\n\u001b[0;32m 16\u001b[0m \u001b[38;5;28mprint\u001b[39m(\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mError: This product is not in the inventory. Please enter a valid product name.\u001b[39m\u001b[38;5;124m\"\u001b[39m)\n\u001b[0;32m 17\u001b[0m \u001b[38;5;28;01mcontinue\u001b[39;00m\n\u001b[1;32m---> 19\u001b[0m \u001b[38;5;28;01mif\u001b[39;00m \u001b[43minventory\u001b[49m\u001b[43m[\u001b[49m\u001b[43mproduct_name\u001b[49m\u001b[43m]\u001b[49m \u001b[38;5;241m<\u001b[39m\u001b[38;5;241m=\u001b[39m \u001b[38;5;241m0\u001b[39m:\n\u001b[0;32m 20\u001b[0m \u001b[38;5;28mprint\u001b[39m(\u001b[38;5;124mf\u001b[39m\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mError: \u001b[39m\u001b[38;5;132;01m{\u001b[39;00mproduct_name\u001b[38;5;132;01m}\u001b[39;00m\u001b[38;5;124m is out of stock.\u001b[39m\u001b[38;5;124m\"\u001b[39m)\n\u001b[0;32m 21\u001b[0m \u001b[38;5;28;01mcontinue\u001b[39;00m\n",
"\u001b[1;31mTypeError\u001b[0m: list indices must be integers or slices, not str"
]
}
],
"source": [
"products = [\"apple\", \"banana\", \"orange\"]\n",
"\n",
"# Step 1: Initialize inventory with error handling\n",
"inventory = products\n",
"\n",
"# Step 2: Set prices with error handling\n",
"prices = calculate_total_price(products)\n",
"\n",
"# Step 3: Get customer orders with error handling\n",
"orders = get_customer_orders(inventory)\n",
"\n",
"# Display final order summary\n",
"print(\"\\nOrder Summary:\")\n",
"total_cost = 0\n",
"for product, quantity in orders.items():\n",
" cost = prices[product] * quantity\n",
" total_cost += cost\n",
" print(f\"{quantity} x {product} @ {prices[product]} each = {cost}\")\n",
"\n",
"print(f\"Total Cost: {total_cost}\")\n"
]
}
],
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98 changes: 0 additions & 98 deletions lab-python-error-handling.ipynb
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