diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..2480337 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -70,13 +70,134 @@
     "   - 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"
+    "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",
+    "het"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "4e9b7c55",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Error: invalid literal for int() with base 10: '' Please enter a valid non-negative integer.\n",
+      "Error: invalid literal for int() with base 10: '' Please enter a valid non-negative integer.\n",
+      "\n",
+      "Inventory initialized: {'t-shirt': 2, 'mug': 3, 'hat': 3, 'book': 4, 'keychain': 43}\n",
+      "\n",
+      "Total inventory value: 745.00\n",
+      "Error: Product does not exist in inventory. Please enter a valid product name.\n",
+      "Error: Product does not exist in inventory. Please enter a valid product name.\n"
+     ]
+    }
+   ],
+   "source": [
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "\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(\"Quantity cannot be negative.\")\n",
+    "                inventory[product] = quantity\n",
+    "                break\n",
+    "            except ValueError as error:\n",
+    "                print(f\"Error: {error} Please enter a valid non-negative integer.\")\n",
+    "\n",
+    "    return inventory\n",
+    "\n",
+    "\n",
+    "def calculate_total_price(inventory):\n",
+    "    total_price = 0\n",
+    "\n",
+    "    for product, quantity in inventory.items():\n",
+    "        while True:\n",
+    "            try:\n",
+    "                price = float(input(f\"Enter the price of one {product}: \"))\n",
+    "                if price < 0:\n",
+    "                    raise ValueError(\"Price cannot be negative.\")\n",
+    "                total_price += quantity * price\n",
+    "                break\n",
+    "            except ValueError as error:\n",
+    "                print(f\"Error: {error} Please enter a valid non-negative number.\")\n",
+    "\n",
+    "    return total_price\n",
+    "\n",
+    "\n",
+    "def get_customer_orders(inventory):\n",
+    "    customer_orders = []\n",
+    "\n",
+    "    while True:\n",
+    "        try:\n",
+    "            num_orders = int(input(\"Enter the number of customer orders: \"))\n",
+    "            if num_orders < 0:\n",
+    "                raise ValueError(\"Number of orders cannot be negative.\")\n",
+    "            break\n",
+    "        except ValueError as error:\n",
+    "            print(f\"Error: {error} Please enter a valid non-negative integer.\")\n",
+    "\n",
+    "    for i in range(num_orders):\n",
+    "        while True:\n",
+    "            product = input(f\"Enter product for order {i + 1}: \").strip().lower()\n",
+    "\n",
+    "            if product not in inventory:\n",
+    "                print(\"Error: Product does not exist in inventory. Please enter a valid product name.\")\n",
+    "            elif inventory[product] <= 0:\n",
+    "                print(\"Error: Product is out of stock. Please choose another product.\")\n",
+    "            else:\n",
+    "                customer_orders.append(product)\n",
+    "                inventory[product] -= 1\n",
+    "                break\n",
+    "\n",
+    "    return customer_orders\n",
+    "\n",
+    "\n",
+    "def main():\n",
+    "    products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "    inventory = initialize_inventory(products)\n",
+    "    print(\"\\nInventory initialized:\", inventory)\n",
+    "\n",
+    "    total_price = calculate_total_price(inventory)\n",
+    "    print(f\"\\nTotal inventory value: {total_price:.2f}\")\n",
+    "\n",
+    "    customer_orders = get_customer_orders(inventory)\n",
+    "    print(\"\\nCustomer orders:\", customer_orders)\n",
+    "    print(\"Updated inventory:\", inventory)\n",
+    "\n",
+    "\n",
+    "if __name__ == \"__main__\":\n",
+    "    main()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "e8ee2f48",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "6e89b5db",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "´"
    ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -90,7 +211,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.5"
   }
  },
  "nbformat": 4,