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Complete error handling lab #599

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385 changes: 385 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",
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"source": [
"# Lab | Error Handling"
]
},
{
"cell_type": "markdown",
"id": "bc99b386-7508-47a0-bcdb-d969deaf6c8b",
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"## 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"
]
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{
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"source": [
"# 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"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "ff199957-0723-4cef-8204-7de27b7c210d",
"metadata": {},
"outputs": [
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the quantity of t-shirts available: 5\n",
"Enter the quantity of mugs available: -1\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 mugs available: 3\n",
"Enter the quantity of hats available: tres\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Invalid input. Please enter a valid quantity.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the quantity of hats available: 5\n",
"Enter the quantity of books available: 0\n",
"Enter the quantity of keychains available: 43e\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Invalid input. Please enter a valid quantity.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the quantity of keychains available: 5\n",
"Enter the number of customer orders: 3\n",
"Enter the name of product 1: table\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error:This product is not in the inventory.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the name of product 1: mug\n",
"Enter the name of product 2: mug\n",
"Enter the name of product 3: h12\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error:This product is not in the inventory.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the name of product 3: Hat\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"\n",
"Order Statistics:\n",
"Total Products Ordered: 3\n",
"Percentage of Products Ordered: 60.0 %\n",
"\n",
"Updated Inventory:\n",
"t-shirt: 5\n",
"mug: 1\n",
"hat: 4\n",
"book: 0\n",
"keychain: 5\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the price of mug: 5\n",
"Enter the price of mug: 5\n",
"Enter the price of hat: 23\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Total Price: 33.0\n"
]
}
],
"source": [
"#Last exercise code lIST COMPREHENSION\n",
"\n",
"# Function 1 ---- CHANGE FOR Q1\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",
" # Function 2 --- CHANGE FOR Q3\n",
"def get_customer_orders (inventory):\n",
" customer_orders= []\n",
"\n",
" while True:\n",
" try:\n",
" num_orders =int(input(\"Enter the number of customer orders: \"))\n",
" if num_orders <0:\n",
" print(\"The number of orders cannot be negative. Please place a correct number.\")\n",
" else:\n",
" break\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid quantity.\")\n",
" for pname in range(num_orders):\n",
" valid_product = False\n",
" while not valid_product:\n",
" try:\n",
" product = input(f\"Enter the name of product {pname + 1}: \").lower()\n",
"\n",
" if product not in inventory:\n",
" raise ValueError(\"This product is not in the inventory.\")\n",
"\n",
" if inventory [product] <= 0:\n",
" raise ValueError(\"This product is out of stock.\")\n",
"\n",
" customer_orders.append(product)\n",
" inventory [product] -= 1\n",
" valid_product = True\n",
"\n",
" except ValueError as error:\n",
" print(f\"Error:{error}\")\n",
"\n",
" return customer_orders\n",
" \n",
"\n",
"#NEW FUNCTION --- CHANGE FOR Q2\n",
"\n",
"def calculate_total_price (customer_orders):\n",
" total_price = 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 of {product}: \"))\n",
" if price >= 0:\n",
" total_price += 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",
" \n",
" return total_price\n",
"\n",
" # Function 4\n",
"def calculate_order_statistics (customer_orders, products):\n",
" total_products_ordered = len(customer_orders)\n",
" \n",
" percentage_ordered = (total_products_ordered / len(products)) * 100\n",
" \n",
" return total_products_ordered,percentage_ordered\n",
"\n",
"''' Print the total price of the customer order. '''\n",
" #Function 5\n",
"def print_order_statistics(order_statistics):\n",
" total_products_ordered = order_statistics [0]\n",
" percentage_ordered = order_statistics [1]\n",
" \n",
" print(\"\\nOrder Statistics:\")\n",
" print(\"Total Products Ordered:\", total_products_ordered)\n",
" print(\"Percentage of Products Ordered:\", percentage_ordered, \"%\")\n",
"\n",
" #Function 6 - HERE Q1\n",
"def print_updated_inventory (inventory):\n",
" print(\"\\nUpdated Inventory:\")\n",
" for product, quantity in inventory.items():\n",
" print(f\"{product}: {quantity}\")\n",
"\n",
"# List of products\n",
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
"\n",
"inventory =initialize_inventory(products)\n",
"customer_orders = get_customer_orders (inventory)\n",
"order_statistics = calculate_order_statistics (customer_orders, products)\n",
"print_order_statistics(order_statistics)\n",
"print_updated_inventory (inventory)\n",
"\n",
"total_price = calculate_total_price(customer_orders)\n",
"print(f\"Total Price: {total_price}\")\n"
]
},
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