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Solved Lab #530

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337 changes: 334 additions & 3 deletions lab-python-error-handling.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -72,13 +72,344 @@
"\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": "fc5a97c7-ccac-4b2f-9f20-5f94d0e089ec",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Enter the initial quantities:\n",
"\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the quantity of t-shirt: 25\n",
"Enter the quantity of mug: 5\n",
"Enter the quantity of hat: 13\n",
"Enter the quantity of book: 8\n",
"Enter the quantity of keychain: 9\n",
"\n",
"Enter the number of customer orders: 7\n",
"\n",
"Enter a product name: 3\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: Only letters, spaces and hyphens allowed.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"\n",
"Enter a product name: casa\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: Product not found. Available products:\n",
"t-shirt, mug, hat, book, keychain\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"\n",
"Enter a product name: mug\n",
"\n",
"Enter a product name: hat\n",
"\n",
"Enter a product name: bok\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: Product not found. Available products:\n",
"t-shirt, mug, hat, book, keychain\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"\n",
"Enter a product name: book\n",
"\n",
"Enter a product name: t-shirt\n",
"\n",
"Enter a product name: \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: Only letters, spaces and hyphens allowed.\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"\n",
"Enter a product name: keychain\n",
"\n",
"Enter a product name: book\n",
"\n",
"Enter a product name: mug\n",
"Enter the price for hat: 50\n",
"Enter the price for t-shirt: 15\n",
"Enter the price for keychain: 84\n",
"Enter the price for mug: dos\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: could not convert string to float: 'dos'. Please enter a valid price (e.g., 5.99).\n"
]
},
{
"name": "stdin",
"output_type": "stream",
"text": [
"Enter the price for mug: 73\n",
"Enter the price for book: 1.85\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"text": [
"\n",
"Order Statistics\n",
"Total Products Ordered: 5\n",
"Percentage of Unique Products Ordered: 100.00%\n",
"\n",
"Updated Inventory:\n",
"t-shirt: 24\n",
"mug: 4\n",
"hat: 12\n",
"book: 7\n",
"keychain: 8\n",
"\n",
"Total Price: 223.85\n"
]
}
],
"source": [
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
"\n",
"\n",
"# -------------------------------------------------------------------\n",
"# 1. Initialize inventory with error handling\n",
"# -------------------------------------------------------------------\n",
"def initialize_inventory(products):\n",
" inventory = {}\n",
" print(\"Enter the initial quantities:\\n\")\n",
"\n",
" for product in products:\n",
" while True:\n",
" try:\n",
" qty = int(input(f\"Enter the quantity of {product}: \"))\n",
"\n",
" if qty < 0:\n",
" raise ValueError(\"Quantity cannot be negative.\")\n",
"\n",
" inventory[product] = qty\n",
" break\n",
"\n",
" except ValueError as e:\n",
" print(f\"Error: {e}. Please enter a valid non-negative integer.\")\n",
"\n",
" return inventory\n",
"\n",
"\n",
"# -------------------------------------------------------------------\n",
"# Helper: validate product names (letters, spaces and hyphens only)\n",
"# -------------------------------------------------------------------\n",
"def is_valid_product_name(name):\n",
" if not name.strip():\n",
" return False\n",
"\n",
" for ch in name:\n",
" if not (ch.isalpha() or ch in [\" \", \"-\"]):\n",
" return False\n",
"\n",
" return True\n",
"\n",
"\n",
"# -------------------------------------------------------------------\n",
"# 2. Get customer orders with error handling\n",
"# -------------------------------------------------------------------\n",
"def get_customer_orders(products, inventory):\n",
"\n",
" # Validate number of orders\n",
" while True:\n",
" try:\n",
" num_str = input(\"\\nEnter the number of customer orders: \")\n",
" num_orders = int(num_str)\n",
"\n",
" if num_orders < 0:\n",
" raise ValueError(\"Number of orders cannot be negative.\")\n",
"\n",
" break\n",
" except ValueError as e:\n",
" print(f\"Error: {e}. Please enter a non-negative integer.\")\n",
"\n",
" lower_products = [p.lower() for p in products]\n",
" customer_orders = set()\n",
"\n",
" for _ in range(num_orders):\n",
" while True:\n",
" product_raw = input(\"\\nEnter a product name: \").strip()\n",
" product = product_raw.lower()\n",
"\n",
" # Character validation\n",
" if not is_valid_product_name(product_raw):\n",
" print(\"Error: Only letters, spaces and hyphens allowed.\")\n",
" continue\n",
"\n",
" # Product must exist\n",
" if product not in lower_products:\n",
" print(\"Error: Product not found. Available products:\")\n",
" print(\", \".join(products))\n",
" continue\n",
"\n",
" # Find the correct key with original case\n",
" real_key = next((p for p in inventory.keys() if p.lower() == product), None)\n",
"\n",
" # Must be in stock\n",
" if inventory.get(real_key, 0) <= 0:\n",
" print(f\"Error: {real_key} is out of stock.\")\n",
" continue\n",
"\n",
" customer_orders.add(product)\n",
" break\n",
"\n",
" return customer_orders\n",
"\n",
"\n",
"# -------------------------------------------------------------------\n",
"# 3. Calculate total price with error handling\n",
"# -------------------------------------------------------------------\n",
"def calculate_total_price(customer_orders):\n",
"\n",
" total = 0.0\n",
"\n",
" for product in customer_orders:\n",
" while True:\n",
" try:\n",
" price_str = input(f\"Enter the price for {product}: \")\n",
" price = float(price_str)\n",
"\n",
" if price < 0:\n",
" raise ValueError(\"Price cannot be negative.\")\n",
"\n",
" total += price\n",
" break\n",
"\n",
" except ValueError as e:\n",
" print(f\"Error: {e}. Please enter a valid price (e.g., 5.99).\")\n",
"\n",
" return total\n",
"\n",
"\n",
"# -------------------------------------------------------------------\n",
"# 4. Update inventory (remove zero-stock items)\n",
"# -------------------------------------------------------------------\n",
"def update_inventory(customer_orders, inventory):\n",
"\n",
" for item in customer_orders:\n",
" key = next((k for k in inventory.keys() if k.lower() == item), None)\n",
" if key:\n",
" inventory[key] -= 1\n",
"\n",
" # Remove zero/negative quantities\n",
" inventory = {p: q for p, q in inventory.items() if q > 0}\n",
" return inventory\n",
"\n",
"\n",
"# -------------------------------------------------------------------\n",
"# 5. Calculate statistics\n",
"# -------------------------------------------------------------------\n",
"def calculate_order_statistics(customer_orders, products):\n",
" total_ordered = len(customer_orders)\n",
" percentage = (total_ordered / len(products) * 100) if products else 0\n",
" return total_ordered, percentage\n",
"\n",
"\n",
"# -------------------------------------------------------------------\n",
"# 6. Print statistics\n",
"# -------------------------------------------------------------------\n",
"def print_order_statistics(stats):\n",
" print(\"\\nOrder Statistics\")\n",
" print(f\"Total Products Ordered: {stats[0]}\")\n",
" print(f\"Percentage of Unique Products Ordered: {stats[1]:.2f}%\")\n",
"\n",
"\n",
"# -------------------------------------------------------------------\n",
"# 7. Print updated inventory\n",
"# -------------------------------------------------------------------\n",
"def print_updated_inventory(inventory):\n",
" print(\"\\nUpdated Inventory:\")\n",
"\n",
" if not inventory:\n",
" print(\"All items are out of stock.\")\n",
" return\n",
"\n",
" for product, qty in inventory.items():\n",
" print(f\"{product}: {qty}\")\n",
"\n",
"\n",
"# ===================================================================\n",
"# Program Execution\n",
"# ===================================================================\n",
"\n",
"inventory = initialize_inventory(products)\n",
"customer_orders = get_customer_orders(products, inventory)\n",
"total_price = calculate_total_price(customer_orders)\n",
"inventory = update_inventory(customer_orders, inventory)\n",
"stats = calculate_order_statistics(customer_orders, products)\n",
"\n",
"print_order_statistics(stats)\n",
"print_updated_inventory(inventory)\n",
"\n",
"print(f\"\\nTotal Price: {total_price:.2f}\")"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "121bf43d-dbfc-4b54-a79d-57eee5d512d8",
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "Python [conda env:base] *",
"language": "python",
"name": "python3"
"name": "conda-base-py"
},
"language_info": {
"codemirror_mode": {
Expand All @@ -90,7 +421,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.5"
}
},
"nbformat": 4,
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