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Resolution error handling #587

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98 changes: 98 additions & 0 deletions .ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb
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@@ -0,0 +1,98 @@
{
"cells": [
{
"cell_type": "markdown",
"id": "25d7736c-ba17-4aff-b6bb-66eba20fbf4e",
"metadata": {},
"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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165 changes: 164 additions & 1 deletion lab-python-error-handling.ipynb
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Expand Up @@ -72,6 +72,169 @@
"\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": 52,
"id": "e47153c6-cf84-43af-ba4a-7880b9769db7",
"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",
"Enter the number of customer orders: 3\n",
"Enter product name: mug\n",
"Enter product name: mug\n",
"Enter product name: mug\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Sorry, mug is out of stock.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter product name: hat\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Order Statistics:\n",
"Total Products Ordered: 3\n",
"Percentage of Products Ordered: 60.0 %\n",
"Updated Inventory: {'t-shirt': 2, 'mug': 0, 'hat': 1, 'book': 2, 'keychain': 2}\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the price of mug: 5\n",
"Enter the price of hat: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Total price of the order: 20.0\n"
]
}
],
"source": [
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
"\n",
"# Initialize inventory\n",
"\n",
"def initialize_inventory(products):\n",
" inventory = {}\n",
" for product in products:\n",
" while True:\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",
" break\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
" inventory[product] = quantity\n",
" return inventory\n",
"\n",
"# Get customer orders\n",
"\n",
"def get_customer_orders(products, inventory):\n",
" while True:\n",
" try: \n",
" num_orders = int(input(\"Enter the number of customer orders: \"))\n",
" if num_orders < 0:\n",
" raise ValueError(\"Invalid order! Please enter a non-negative value.\")\n",
" break\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
"\n",
" customer_orders = {}\n",
" \n",
" for i in range(num_orders):\n",
" while True:\n",
" product_name = input(f\"Enter product name: \").strip().lower()\n",
"\n",
" if product_name not in products:\n",
" print(\"Product not available. Available products:\", products)\n",
" elif inventory[product_name] <= 0:\n",
" print(f\"Sorry, {product_name} is out of stock.\")\n",
" else:\n",
" if product_name in customer_orders:\n",
" customer_orders[product_name] += 1\n",
" else:\n",
" customer_orders[product_name] = 1\n",
"\n",
" inventory[product_name] -= 1\n",
" break\n",
" \n",
"\n",
" return customer_orders\n",
"\n",
"# Order statistics\n",
"\n",
"def calculate_order_statistics(customer_orders, products):\n",
" total_products_ordered = sum(customer_orders.values())\n",
" percentage_ordered = (total_products_ordered / len(products)) * 100\n",
" return total_products_ordered, percentage_ordered \n",
"\n",
"# Total price\n",
"\n",
"def total_price(customer_orders):\n",
" total = 0\n",
" for product, quantity in customer_orders.items():\n",
" while True:\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",
" total += price * quantity\n",
" break\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
"\n",
" return total\n",
"\n",
"# main program\n",
"\n",
"inventory = initialize_inventory(products)\n",
"\n",
"customer_orders = get_customer_orders(products, inventory)\n",
"\n",
"total, percentage = calculate_order_statistics(customer_orders, products)\n",
"\n",
"print(\"Order Statistics:\")\n",
"print(\"Total Products Ordered:\", total)\n",
"print(\"Percentage of Products Ordered:\", percentage, \"%\")\n",
"\n",
"print(f\"Updated Inventory:\", inventory)\n",
"\n",
"print(f\"Total price of the order:\", total_price(customer_orders))"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "45f2676d-3579-4fcb-b8f4-7e59e52064c6",
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}
],
"metadata": {
Expand All @@ -90,7 +253,7 @@
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