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209 changes: 207 additions & 2 deletions lab-python-error-handling.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -72,11 +72,216 @@
"\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": "ed41bf89",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"\n",
"--- Initialize Inventory ---\n",
"Error: Invalid input! Please enter a valid whole number.\n",
"Error: Invalid input! Please enter a valid whole number.\n",
"Error: Invalid input! Please enter a valid whole number.\n",
"Error: Quantity cannot be negative. Please try again.\n",
"Error: Quantity cannot be negative. Please try again.\n",
"\n",
"--- Get Customer Orders ---\n",
"Error: 'pen' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'pencil' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'rubber' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'notebook' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'hoodie' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'letter' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'laptop' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'computer' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'letter' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'headphone' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'bag' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'tab' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'spoon' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'jbelt' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'belt' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'cable' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'toy' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'router' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'chair' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'clock' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'mouse' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'bed' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'mat' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'violin' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'computer' does not exist in our inventory catalog. Please try a different product.\n",
"Error: 'tape' does not exist in our inventory catalog. Please try a different product.\n",
"Error: '' does not exist in our inventory catalog. Please try a different product.\n"
]
}
],
"source": [
"from functools import reduce\n",
"\n",
"def initialize_inventory(products):\n",
" \"\"\"1. Initializes the inventory dictionary with robust numeric validation loops.\"\"\"\n",
" inventory = {}\n",
" print(\"\\n--- Initialize 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: \").strip())\n",
" if quantity >= 0:\n",
" inventory[product] = quantity\n",
" valid_input = True\n",
" else:\n",
" print(\"Error: Quantity cannot be negative. Please try again.\")\n",
" except ValueError:\n",
" print(\"Error: Invalid input! Please enter a valid whole number.\")\n",
" return inventory\n",
"\n",
"\n",
"def get_customer_orders(inventory):\n",
" \"\"\"3. Gathers orders with error handling for negative counts, missing items, and out-of-stock items.\"\"\"\n",
" print(\"\\n--- Get Customer Orders ---\")\n",
" \n",
" # Part A: Validate the total number of orders requested\n",
" while True:\n",
" try:\n",
" num_orders = int(input(\"Enter the number of customer orders: \").strip())\n",
" if num_orders < 0:\n",
" print(\"Error: Number of orders cannot be negative. Please try again.\")\n",
" continue\n",
" break\n",
" except ValueError:\n",
" print(\"Error: Invalid input! Please enter a valid whole number.\")\n",
"\n",
" # Create a quick lowercase mapping to handle case-insensitive entries safely\n",
" inventory_lowercase = {product.lower(): product for product in inventory}\n",
" customer_orders = set()\n",
" \n",
" # Part B: Gather and validate individual product names\n",
" for i in range(num_orders):\n",
" while True:\n",
" order = input(f\"Enter the name of product #{i+1} that a customer wants to order: \").strip()\n",
" order_lower = order.lower()\n",
" \n",
" # Check 1: Does the product exist in the store catalog?\n",
" if order_lower not in inventory_lowercase:\n",
" print(f\"Error: '{order}' does not exist in our inventory catalog. Please try a different product.\")\n",
" continue\n",
" \n",
" original_name = inventory_lowercase[order_lower]\n",
" \n",
" # Check 2: Does the product have stock available right now?\n",
" if inventory[original_name] <= 0:\n",
" print(f\"Error: '{original_name}' is currently out of stock! Please choose a different product.\")\n",
" continue\n",
" \n",
" # If all checks pass, add to order records and break the retry loop\n",
" customer_orders.add(original_name)\n",
" break\n",
" \n",
" return customer_orders\n",
"\n",
"\n",
"def update_inventory(customer_orders, inventory):\n",
" \"\"\"Updates inventory counts and uses a comprehension to filter out products with 0 stock.\"\"\"\n",
" # Deduct stock for chosen items (validation in previous step guarantees stock exists)\n",
" for order in customer_orders:\n",
" if order in inventory:\n",
" inventory[order] -= 1\n",
"\n",
" # Dictionary Comprehension: Automatically filters out items whose quantity drops to 0\n",
" updated_inventory = {prod: qty for prod, qty in inventory.items() if qty > 0}\n",
" \n",
" inventory.clear()\n",
" inventory.update(updated_inventory)\n",
"\n",
"\n",
"def calculate_order_statistics(customer_orders, products):\n",
" \"\"\"Calculates order statistics using a list filter operation.\"\"\"\n",
" total_products_ordered = len(customer_orders)\n",
" products_lower = [p.lower() for p in products]\n",
" \n",
" valid_orders_count = sum(1 for order in customer_orders if order.lower() in products_lower)\n",
" \n",
" percentage_ordered = (valid_orders_count / len(products)) * 100 if products else 0.0\n",
" return total_products_ordered, percentage_ordered\n",
"\n",
"\n",
"def print_order_statistics(order_statistics):\n",
" \"\"\"Prints the calculated order statistics.\"\"\"\n",
" total, percentage = order_statistics\n",
" print(\"\\nOrder Statistics:\")\n",
" print(f\"Total Products Ordered: {total}\")\n",
" print(f\"Percentage of Unique Products Ordered: {percentage:.1f}%\")\n",
"\n",
"\n",
"def print_updated_inventory(inventory):\n",
" \"\"\"Prints the updated inventory contents cleanly.\"\"\"\n",
" print(\"\\nUpdated Inventory:\")\n",
" for product, quantity in inventory.items():\n",
" print(f\"{product}: {quantity}\")\n",
"\n",
"\n",
"def calculate_total_price(customer_orders):\n",
" \"\"\"2 & 5. Prompts for product prices with error handling and prints the total sum.\"\"\"\n",
" print() # Formatted padding spacing\n",
" total_price = 0.0\n",
" \n",
" for product in customer_orders:\n",
" while True:\n",
" try:\n",
" price = float(input(f\"Enter the price of {product}: \").strip())\n",
" if price < 0:\n",
" print(\"Error: Price cannot be negative. Please try again.\")\n",
" continue\n",
" total_price += price\n",
" break\n",
" except ValueError:\n",
" print(\"Error: Invalid input! Please enter a valid decimal number (e.g., 10.50).\")\n",
" \n",
" print(f\"Total Price: ${total_price:.2f}\")\n",
" return total_price\n",
"\n",
"\n",
"# 7. Main program control flow\n",
"if __name__ == \"__main__\":\n",
" # Base product master catalog array\n",
" products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
" \n",
" # 1. Initialize\n",
" inventory = initialize_inventory(products)\n",
" \n",
" # 2 & 3. Fetch orders (passing active inventory dictionary for cross-checking)\n",
" customer_orders = get_customer_orders(inventory)\n",
" \n",
" # 4. Process analytics and modify system inventory counts\n",
" order_statistics = calculate_order_statistics(customer_orders, products)\n",
" update_inventory(customer_orders, inventory)\n",
" \n",
" # 5 & 6. Print final outputs out to console terminal\n",
" print_order_statistics(order_statistics)\n",
" print_updated_inventory(inventory)\n",
" calculate_total_price(customer_orders)\n"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "fa28824d",
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "base",
"language": "python",
"name": "python3"
},
Expand All @@ -90,7 +295,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.9"
}
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"nbformat": 4,
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