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lab5 done #500

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195 changes: 193 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 +72,202 @@
"\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": 1,
"id": "714ea21a",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"\n",
"=== Initialize Inventory ===\n",
"\n",
"=== Take Customer Orders ===\n",
"Error: invalid literal for int() with base 10: 't-shirt' Please enter 0 or a positive integer.\n",
"Error: invalid literal for int() with base 10: 'mug' Please enter 0 or a positive integer.\n",
"\n",
"Order Statistics:\n",
"Total Products Ordered: 3\n",
"Percentage of Unique Products Ordered: 60.0\n",
"\n",
"=== Update Inventory ===\n",
"- 'mug' deducted by 1. New stock: 4\n",
"- 't-shirt' deducted by 1. New stock: 4\n",
"- 'keychain' deducted by 1. New stock: 4\n",
"\n",
"Updated Inventory:\n",
"t-shirt: 4\n",
"mug: 4\n",
"hat: 5\n",
"book: 5\n",
"keychain: 4\n",
"\n",
"Total Price: 35.0\n"
]
}
],
"source": [
"def initialize_inventory(products):\n",
" \"\"\"\n",
" Ask the user for a starting quantity for each product.\n",
" Validates: integer, non-negative.\n",
" \"\"\"\n",
" inventory = {}\n",
" print(\"\\n=== Initialize Inventory ===\")\n",
" for product in products:\n",
" while True:\n",
" try:\n",
" raw = input(f\"Enter the quantity of {product}s available: \")\n",
" qty = int(raw)\n",
" if qty < 0:\n",
" raise ValueError(\"Quantity cannot be negative.\")\n",
" inventory[product] = qty\n",
" break\n",
" except ValueError as err:\n",
" print(f\"Error: {err} Please enter a non-negative integer.\")\n",
" return inventory\n",
"\n",
"\n",
"def get_customer_orders(inventory):\n",
" \"\"\"\n",
" Ask how many orders to take (validated), then collect product names.\n",
" Validates: product must exist in inventory AND have stock > 0.\n",
" Returns a set of unique product names (1 unit max per product).\n",
" \"\"\"\n",
" print(\"\\n=== Take Customer Orders ===\")\n",
" # Validate number of orders\n",
" while True:\n",
" try:\n",
" raw = input(\"Enter the number of customer orders: \")\n",
" n = int(raw)\n",
" if n < 0:\n",
" raise ValueError(\"Number of orders cannot be negative.\")\n",
" break\n",
" except ValueError as err:\n",
" print(f\"Error: {err} Please enter 0 or a positive integer.\")\n",
"\n",
" orders = set()\n",
" i = 0\n",
" while i < n:\n",
" name = input(\"Enter the name of a product that a customer wants to order: \").strip().lower()\n",
" if name not in inventory:\n",
" print(f\"Error: '{name}' is not in the inventory. Available: {', '.join(inventory.keys()) or '(none)'}\")\n",
" continue\n",
" if inventory[name] <= 0:\n",
" print(f\"Error: '{name}' is out of stock. Choose another product.\")\n",
" continue\n",
"\n",
" # if already ordered (set), we still allow but it won’t double-count;\n",
" # if you prefer to forbid duplicates, uncomment next two lines:\n",
" # if name in orders:\n",
" # print(\"That product is already in the order (1 unit per product). Choose another.\"); continue\n",
"\n",
" orders.add(name)\n",
" i += 1\n",
"\n",
" return orders\n",
"\n",
"\n",
"def update_inventory(customer_orders, inventory):\n",
" \"\"\"\n",
" Deduct 1 per ordered product if stock is available.\n",
" Then remove zero-stock items with a dict comprehension.\n",
" \"\"\"\n",
" print(\"\\n=== Update Inventory ===\")\n",
" for item in customer_orders:\n",
" if item in inventory and inventory[item] > 0:\n",
" inventory[item] -= 1\n",
" print(f\"- '{item}' deducted by 1. New stock: {inventory[item]}\")\n",
" else:\n",
" # Shouldn't happen due to validation, but keep it safe\n",
" print(f\"- '{item}' not deducted (not found or no stock).\")\n",
"\n",
" # Filter out zero-quantity products\n",
" inventory = {k: v for k, v in inventory.items() if v > 0}\n",
" return inventory\n",
"\n",
"\n",
"def calculate_order_statistics(customer_orders, products):\n",
" \"\"\"\n",
" Compute total unique products ordered and percentage vs catalog size.\n",
" \"\"\"\n",
" total_unique = len(customer_orders)\n",
" percent_unique = (total_unique / len(products) * 100) if products else 0.0\n",
" return total_unique, percent_unique\n",
"\n",
"\n",
"def print_order_statistics(order_statistics):\n",
" total_unique, percent_unique = order_statistics\n",
" print(\"\\nOrder Statistics:\")\n",
" print(f\"Total Products Ordered: {total_unique}\")\n",
" print(f\"Percentage of Unique Products Ordered: {percent_unique:.1f}\")\n",
"\n",
"\n",
"def print_updated_inventory(inventory):\n",
" \"\"\"\n",
" Print inventory (or a message if empty).\n",
" \"\"\"\n",
" print(\"\\nUpdated Inventory:\")\n",
" if not inventory:\n",
" print(\"(All items are out of stock.)\")\n",
" return\n",
" print(\"\\n\".join(f\"{k}: {v}\" for k, v in inventory.items()))\n",
"\n",
"\n",
"def calculate_total_price(customer_orders):\n",
" \"\"\"\n",
" Prompt for price of each ordered product and sum them.\n",
" Validates: float, non-negative.\n",
" Returns the total price (float).\n",
" \"\"\"\n",
" print()\n",
" prices = {}\n",
" for item in customer_orders:\n",
" while True:\n",
" try:\n",
" raw = input(f\"Enter the price of {item}: \")\n",
" price = float(raw)\n",
" if price < 0:\n",
" raise ValueError(\"Price cannot be negative.\")\n",
" prices[item] = price\n",
" break\n",
" except ValueError as err:\n",
" print(f\"Error: {err} Please enter a non-negative number (e.g., 0, 5, 10.5).\")\n",
" return sum(prices.values())\n",
"\n",
"\n",
"if __name__ == \"__main__\":\n",
" products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
"\n",
" inventory = initialize_inventory(products)\n",
" customer_orders = get_customer_orders(inventory)\n",
"\n",
" stats = calculate_order_statistics(customer_orders, products)\n",
" print_order_statistics(stats)\n",
"\n",
" inventory = update_inventory(customer_orders, inventory)\n",
" print_updated_inventory(inventory)\n",
"\n",
" total_price = calculate_total_price(customer_orders)\n",
" print(f\"Total Price: {total_price:.1f}\")\n"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "1b9a413c",
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
Expand All @@ -90,7 +281,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.9.6"
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"nbformat": 4,
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