diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index 3e50ef8..d430bd0 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -41,13 +41,182 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "id": "cc2c441d-9dcf-4817-b097-cf6cbe440846",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# your code goes here"
+    "# your code goes here\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "    for product in products:\n",
+    "        while True:\n",
+    "            try:\n",
+    "                quantity = input(f\"Enter the quantity for {product}: \").strip()\n",
+    "                if not quantity.isdigit():\n",
+    "                    raise ValueError(f\"{quantity} is not a valid quantity. Please enter a positive integer.\")\n",
+    "                inventory[product] = int(quantity)\n",
+    "                break\n",
+    "            except ValueError as e:\n",
+    "                print(e)\n",
+    "    return inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "f84e6933-a2dd-4e1d-866e-751e5b1b8db8",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_customer_orders():\n",
+    "    customer_orders = set()\n",
+    "    products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "    while True:\n",
+    "        try:\n",
+    "            product = input(\"Enter the name of a product to order (from t-shirt, mug, hat, book, keychain): \").strip().lower()\n",
+    "            if product not in products:\n",
+    "                raise ValueError(f\"{product} is not a valid product. Please choose from the list: {products}\")\n",
+    "            customer_orders.add(product)\n",
+    "            print(f\"{product} has been added to your order.\")\n",
+    "            \n",
+    "            another_product = input(\"Do you want to add another product? (yes/no): \").strip().lower()\n",
+    "            if another_product != \"yes\":\n",
+    "                break\n",
+    "        except ValueError as e:\n",
+    "            print(e)\n",
+    "    return customer_orders\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "id": "bcd6d605-0bc5-47bb-a9f8-079478fc6dca",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def update_inventory(customer_orders, inventory):\n",
+    "    for product in customer_orders:\n",
+    "        try:\n",
+    "            if product in inventory:\n",
+    "                if inventory[product] > 0:\n",
+    "                    inventory[product] -= 1\n",
+    "                else:\n",
+    "                    print(f\"{product} not available\")\n",
+    "            else:\n",
+    "                raise KeyError(f\"{product} doesn't exist in this inventory.\")\n",
+    "        except KeyError as e:\n",
+    "            print(e)\n",
+    "            \n",
+    "    return inventory"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "id": "d674dadf-2417-4c96-b7d7-4bf688ae378c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def calculate_order_statistics(customer_orders, products):\n",
+    "    try:\n",
+    "        total_products_ordered = len(customer_orders)\n",
+    "        percentage_products_ordered = (total_products_ordered / len(products)) * 100\n",
+    "        return total_products_ordered, percentage_products_ordered\n",
+    "    except ZeroDivisionError:\n",
+    "        print(\"Error: The list of products must not be empty.\")\n",
+    "        return 0, 0\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "id": "3406f45f-e310-4542-ab5d-81d8e829eec8",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def print_order_statistics(order_statistics):\n",
+    "    total_products_ordered, percentage_products_ordered = order_statistics\n",
+    "    print(\"Order Statistics:\")\n",
+    "    print(\"Total Products Ordered:\", total_products_ordered)\n",
+    "    print(f\"Percentage of Products Ordered: {percentage_products_ordered:.2f} %\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "id": "d3a9db75-0b97-46d5-8fae-a9d3e2f858b0",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "Enter the quantity for t-shirt:  3\n",
+      "Enter the quantity for mug:  5\n",
+      "Enter the quantity for hat:  1\n",
+      "Enter the quantity for book:  0\n",
+      "Enter the quantity for keychain:  6\n",
+      "Enter the name of a product to order (from t-shirt, mug, hat, book, keychain):  mug\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "mug has been added to your order.\n"
+     ]
+    },
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "Do you want to add another product? (yes/no):  no\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Order Statistics:\n",
+      "Total Products Ordered: 1\n",
+      "Percentage of Products Ordered: 20.00 %\n",
+      "Updated inventory:\n",
+      "t-shirt: 3\n",
+      "mug: 4\n",
+      "hat: 1\n",
+      "book: 0\n",
+      "keychain: 6\n"
+     ]
+    }
+   ],
+   "source": [
+    "def print_updated_inventory(inventory):\n",
+    "    print(\"Updated inventory:\")\n",
+    "    for product, quantity in inventory.items():\n",
+    "        print(f\"{product}: {quantity}\")\n",
+    "\n",
+    "# Execution sequence\n",
+    "try:\n",
+    "    inventory = initialize_inventory(products)\n",
+    "    customer_orders = get_customer_orders()\n",
+    "    inventory = update_inventory(customer_orders, inventory)\n",
+    "    order_statistics = calculate_order_statistics(customer_orders, products)\n",
+    "    print_order_statistics(order_statistics)\n",
+    "    print_updated_inventory(inventory)\n",
+    "except Exception as e:\n",
+    "    print(f\"An unexpected error occurred: {e}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "778209aa-c1a4-4999-9c4f-fbd84a52c00e",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
@@ -66,7 +235,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.12.4"
   }
  },
  "nbformat": 4,