diff --git a/lab-python-functions.ipynb b/lab-python-functions.ipynb
index 44d337b..a954415 100644
--- a/lab-python-functions.ipynb
+++ b/lab-python-functions.ipynb
@@ -43,13 +43,209 @@
     "\n",
     "\n"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "124df5a7-007b-416d-aeec-7a892f94e6e1",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "ce1ef732-1998-43af-9c4f-e97a28100275",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "\n",
+    "    for product in products:\n",
+    "        quantity = int(input(f\"Enter the quantity of {product}: \"))\n",
+    "        inventory[product] = quantity\n",
+    "\n",
+    "    return inventory"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "id": "f0e78b2f-de51-45f1-9fc6-cc484d1393c8",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_customer_orders():\n",
+    "    customer_orders = set()\n",
+    "\n",
+    "    while True:\n",
+    "        product = input(\n",
+    "            \"Enter a product name or type 'stop' to finish: \"\n",
+    "        ).lower()\n",
+    "\n",
+    "        if product in products:\n",
+    "            customer_orders.add(product)\n",
+    "\n",
+    "        elif product == \"stop\":\n",
+    "            print(\"Ordering finished.\")\n",
+    "            break\n",
+    "\n",
+    "        else:\n",
+    "            print(\"This product is not available.\")\n",
+    "\n",
+    "    return customer_orders"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "id": "3cd0df25-5720-45b4-92ea-3887ffb72e5b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def update_inventory(customer_orders,inventory):\n",
+    "    for product in customer_orders:\n",
+    "        if product in inventory and inventory[product] > 0:\n",
+    "         inventory[product] -= 1\n",
+    "\n",
+    "    return inventory\n",
+    "    \n",
+    "    "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 19,
+   "id": "1c51f961-d734-4854-a015-bf88ef386d5c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def calculate_order_statistics(customer_orders, products):\n",
+    "    total_products_ordered = len(customer_orders)\n",
+    "\n",
+    "    percentage_products_ordered = (total_products_ordered / len(products)) * 100\n",
+    "\n",
+    "    return (total_products_ordered, percentage_products_ordered)\n",
+    "\n",
+    "    \n",
+    "    "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 22,
+   "id": "b7120318-05ea-4cbc-88ef-f1fd02b72d0e",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def print_order_statistics(order_statistics ):\n",
+    "    print (\"Order Statistics:\")\n",
+    "    print(f\"Total Products Ordered: {order_statistics[0]}\")\n",
+    "    print(\n",
+    "        f\"Percentage of Unique Products Ordered: \"\n",
+    "        f\"{order_statistics[1]:.2f}%\")\n",
+    "\n",
+    "    \n",
+    "\n",
+    "    "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
+   "id": "aa777fe3-09f5-462e-8572-7f1db17c0c34",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def print_updated_inventory(inventory):\n",
+    "    print(\"Updated Inventory:\")\n",
+    "\n",
+    "    for product, quantity in inventory.items():\n",
+    "        print(f\"{product}: {quantity}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "id": "e307b1d0-57d4-43f5-98db-4c9b3e1eb444",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def print_updated_inventory(inventory):\n",
+    "    print(\"Updated Inventory:\")\n",
+    "\n",
+    "    for product, quantity in inventory.items():\n",
+    "        print(f\"{product}: {quantity}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "id": "9e515355-28ad-4053-ab80-e81703b40837",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "Enter the quantity of t-shirt:  5\n",
+      "Enter the quantity of mug:  4\n",
+      "Enter the quantity of hat:  6\n",
+      "Enter the quantity of book:  2\n",
+      "Enter the quantity of keychain:  1\n",
+      "Enter a product name or type 'stop' to finish:  stop\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Ordering finished.\n",
+      "Order Statistics:\n",
+      "Total Products Ordered: 0\n",
+      "Percentage of Unique Products Ordered: 0.00%\n",
+      "Updated Inventory:\n",
+      "t-shirt: 5\n",
+      "mug: 4\n",
+      "hat: 6\n",
+      "book: 2\n",
+      "keychain: 1\n"
+     ]
+    }
+   ],
+   "source": [
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "\n",
+    "inventory = initialize_inventory(products)\n",
+    "customer_orders = get_customer_orders()\n",
+    "inventory = update_inventory(customer_orders, inventory)\n",
+    "\n",
+    "order_statistics = calculate_order_statistics(\n",
+    "    customer_orders,\n",
+    "    products\n",
+    ")\n",
+    "\n",
+    "print_order_statistics(order_statistics)\n",
+    "print_updated_inventory(inventory)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "2846d308-f913-4d34-b246-3351ea50734f",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "pj1_env",
    "language": "python",
-   "name": "python3"
+   "name": "venv"
   },
   "language_info": {
    "codemirror_mode": {
@@ -61,7 +257,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.12.13"
   }
  },
  "nbformat": 4,