diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..59c1366
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.DS_Store
+.ipynb_checkpoints/
+__pycache__/
+data.pkl
diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..0640e21 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -72,6 +72,124 @@
     "\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": "45e5bcda-221d-4ebb-ab6f-ec01f01322cd",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# 1. Initialize inventory with validation\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 number.\")\n",
+    "    return inventory\n",
+    "\n",
+    "# 2. Collect and validate customer orders\n",
+    "def get_customer_orders(inventory):\n",
+    "    valid_num = False\n",
+    "    while not valid_num:\n",
+    "        try:\n",
+    "            num_orders = int(input(\"Enter the number of customer orders: \"))\n",
+    "            if num_orders >= 0:\n",
+    "                valid_num = True\n",
+    "            else:\n",
+    "                print(\"Number of orders cannot be negative.\")\n",
+    "        except ValueError:\n",
+    "            print(\"Invalid input. Please enter a valid number.\")\n",
+    "\n",
+    "    customer_orders = set()\n",
+    "    for _ in range(num_orders):\n",
+    "        valid_product = False\n",
+    "        while not valid_product:\n",
+    "            product = input(\"Enter the name of a product that a customer wants to order: \")\n",
+    "            if product not in inventory:\n",
+    "                print(f\"Error: {product} is not in the inventory. Please try again.\")\n",
+    "            elif inventory[product] <= 0:\n",
+    "                print(f\"Error: {product} is out of stock. Please try again.\")\n",
+    "            else:\n",
+    "                customer_orders.add(product)\n",
+    "                valid_product = True\n",
+    "    return customer_orders\n",
+    "\n",
+    "# 3. Calculate total price with validation\n",
+    "def calculate_total_price(customer_orders):\n",
+    "    total_price = 0\n",
+    "    for product in customer_orders:\n",
+    "        valid_price = False\n",
+    "        while not valid_price:\n",
+    "            try:\n",
+    "                price = float(input(f\"Enter the price of {product}: \"))\n",
+    "                if price >= 0:\n",
+    "                    total_price += price\n",
+    "                    valid_price = 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 numeric price.\")\n",
+    "    return total_price\n",
+    "\n",
+    "# Supporting functions\n",
+    "def update_inventory(customer_orders, inventory):\n",
+    "    for product in customer_orders:\n",
+    "        if product in inventory:\n",
+    "            inventory[product] -= 1\n",
+    "    # Remove out-of-stock products\n",
+    "    inventory = {product: quantity for product, quantity in inventory.items() if quantity > 0}\n",
+    "    return inventory\n",
+    "\n",
+    "def calculate_order_statistics(customer_orders, products):\n",
+    "    total_products_ordered = len(customer_orders)\n",
+    "    percentage_ordered = (total_products_ordered / len(products)) * 100\n",
+    "    return total_products_ordered, percentage_ordered\n",
+    "\n",
+    "def print_order_statistics(order_statistics):\n",
+    "    total_products_ordered, percentage_ordered = order_statistics\n",
+    "    print(\"Order Statistics:\")\n",
+    "    print(f\"Total Products Ordered: {total_products_ordered}\")\n",
+    "    print(f\"Percentage of Unique Products Ordered: {percentage_ordered:.1f}%\")\n",
+    "\n",
+    "def print_updated_inventory(inventory):\n",
+    "    print(\"Updated Inventory:\")\n",
+    "    for product, quantity in inventory.items():\n",
+    "        print(f\"{product}: {quantity}\")\n",
+    "\n",
+    "# Main program flow\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "inventory = initialize_inventory(products)\n",
+    "# Pass the validated inventory to the order function:\n",
+    "customer_orders = get_customer_orders(inventory) \n",
+    "\n",
+    "order_statistics = calculate_order_statistics(customer_orders, products)\n",
+    "print_order_statistics(order_statistics)\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}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "f3f85921-19dd-4bf0-96ec-7c62c40454e8",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
@@ -90,7 +208,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.12.9"
   }
  },
  "nbformat": 4,