diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..04da34c 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -72,11 +72,197 @@
     "\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": 6,
+   "id": "3d67fb50",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "acd370be",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "    for product in products:\n",
+    "        valid_quantity = False\n",
+    "        while not valid_quantity:\n",
+    "            try:\n",
+    "                quantity = int(input(f\"Enter the quantity of {product}s available: \"))\n",
+    "                if quantity < 0:\n",
+    "                    raise ValueError(\"Invalid quantity! Please enter a non-negative value.\")\n",
+    "                valid_quantity = True\n",
+    "            except ValueError as error:\n",
+    "                print(f\"Error: {error}\")\n",
+    "        inventory[product] = quantity\n",
+    "    return inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "id": "ae8dafc4",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def calculate_total_price(customer_orders):\n",
+    "    total_price = 0\n",
+    "    for product in customer_orders:\n",
+    "        print(f\"Select a price for : {product}\")\n",
+    "        \n",
+    "        valid_price = False\n",
+    "        while not valid_price:\n",
+    "            try:\n",
+    "                price = float(input(f\"Enter the price of {product}:\"))\n",
+    "\n",
+    "                if price < 0:\n",
+    "                    print(\"Error: price have to be possitive\")\n",
+    "\n",
+    "                else: \n",
+    "                    total_price += price\n",
+    "                    valid_price = True\n",
+    "            except  ValueError:\n",
+    "                print(\"Error: Enter a valid number please\") \n",
+    "    return total_price  \n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "id": "c2a30f0b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_customer_orders(inventory):\n",
+    "    valid_number = False\n",
+    "    while not valid_number:\n",
+    "        try:\n",
+    "            num_orders = int(input(\"Enter the number of orders: \"))\n",
+    "            if num_orders < 0:\n",
+    "                print(\"Error: Number of order have to be possitive.\")\n",
+    "            else:\n",
+    "                valid_number = True\n",
+    "        except ValueError:\n",
+    "            print(\"Error: Write Enter a valid number please\")\n",
+    "\n",
+    "    customer_orders = []\n",
+    "\n",
+    "    for order in range(num_orders):\n",
+    "\n",
+    "        valid_product = False\n",
+    "\n",
+    "        while not valid_product:\n",
+    "             \n",
+    "            product_name = input(\"Please enter a product name\").strip().lower()\n",
+    "\n",
+    "            if product_name in inventory:\n",
+    "\n",
+    "                if  inventory[product_name] > 0:\n",
+    "                    customer_orders.append(product_name)\n",
+    "                    inventory[product_name] -=1 \n",
+    "                    print(f\"{product_name} add to your order\")\n",
+    "                        \n",
+    "                    valid_product = True\n",
+    "                else:\n",
+    "                    print(f\"Error:{product_name} is out of stock\")\n",
+    "            else:\n",
+    "                print(f\"Error: {product_name} is not in our shop\")\n",
+    "\n",
+    "    return customer_orders\n",
+    "\n",
+    "\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "id": "a9bfdedb",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Error: invalid literal for int() with base 10: ''\n",
+      "Stock {'t-shirt': 1, 'mug': 1, 'hat': 1, 'book': 1, 'keychain': 1}\n"
+     ]
+    }
+   ],
+   "source": [
+    "my_inventory = initialize_inventory(products)\n",
+    "print(f\"Stock {my_inventory}\")\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "id": "e2db7824",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Error: dog is not in our shop\n",
+      "Error:hat is out of stock\n",
+      "mug add to your order\n",
+      "book add to your order\n",
+      "Error:mug is out of stock\n",
+      "Error:book is out of stock\n",
+      "keychain add to your order\n",
+      "Order['mug', 'book', 'keychain']\n"
+     ]
+    }
+   ],
+   "source": [
+    "\n",
+    "my_orders = get_customer_orders(my_inventory)\n",
+    "print(f\"Order{my_orders}\")\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "dbb49dc8",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Select a price for : hat\n",
+      "Error: Enter a valid number please\n",
+      "Error: Enter a valid number please\n",
+      "Total: 21.0\n"
+     ]
+    }
+   ],
+   "source": [
+    "\n",
+    "total = calculate_total_price(my_orders)\n",
+    "print(f\"Total: {total}\") "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "5e37585d",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -90,7 +276,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.5"
   }
  },
  "nbformat": 4,