diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..84da072
Binary files /dev/null and b/.DS_Store differ
diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..9dc1827 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -72,6 +72,160 @@
     "\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": 2,
+   "id": "b893859f-815c-4d51-abd6-c13a825d213d",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "inventory = {}\n",
+    "\n",
+    "\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 quantity.\")\n",
+    "    return inventory\n",
+    "\n",
+    "def get_customer_orders(inventory):\n",
+    "    customer_orders = set()\n",
+    "    while True:\n",
+    "        try:\n",
+    "            orders_number = int(input(\"Enter the number of customer orders:\"))\n",
+    "            if orders_number <= 0:\n",
+    "                print(\"Please enter a number above 0.\")\n",
+    "                continue\n",
+    "        except ValueError as error:\n",
+    "            print(f\"{error}! Please enter a valid number!\")\n",
+    "            continue\n",
+    "                    \n",
+    "        for orders in range(orders_number):\n",
+    "            while True:\n",
+    "                orders = input(f\"Enter a product name:\")\n",
+    "                if orders in products:\n",
+    "                    customer_orders.add(orders)\n",
+    "                    break\n",
+    "                else:\n",
+    "                    print(f\"Please choose one of the available products! Here are your options: {products}\")\n",
+    "\n",
+    "        print(f\"Customer's orders : {customer_orders}\")\n",
+    "        return customer_orders\n",
+    "\n",
+    "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",
+    "    return {product: qty for product, qty in inventory.items() if qty > 0}\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 Products Ordered: {percentage_ordered} % \")\n",
+    "\n",
+    "def calculate_total_price():\n",
+    "    total_price = 0\n",
+    "    for product in customer_orders:\n",
+    "        while True:\n",
+    "            try:\n",
+    "                price = float(input(f\"Enter the price of {product} : \"))\n",
+    "                if price < 0:\n",
+    "                    print(\"Please enter a number above 0.\")\n",
+    "                else:\n",
+    "                    total_price += price\n",
+    "                    break\n",
+    "            except ValueError as error:\n",
+    "                print(f\"{error}! Please enter a valid number.\")\n",
+    "    print(f\"Total price:{total_price:.2f} €\")\n",
+    "\n",
+    "def print_updated_inventory(inventory):\n",
+    "    for products, quantities in inventory.items():\n",
+    "        print(f\"We have {quantities} {products}s!\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "d601dead-dc2c-4d61-bffa-b6a9ec8d971b",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Enter the quantity of t-shirts available:  6\n",
+      "Enter the quantity of mugs available:  4\n",
+      "Enter the quantity of hats available:  3\n",
+      "Enter the quantity of books available:  2\n",
+      "Enter the quantity of keychains available:  5\n",
+      "Enter the number of customer orders: 5\n",
+      "Enter a product name: mug\n",
+      "Enter a product name: book\n",
+      "Enter a product name: hat\n",
+      "Enter a product name: keychain\n",
+      "Enter a product name: mug\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Customer's orders : {'mug', 'keychain', 'book', 'hat'}\n",
+      "Order Statistics:\n",
+      "Total Products Ordered: 4 \n",
+      "Percentage of Products Ordered: 80.0 % \n",
+      "We have 6 t-shirts!\n",
+      "We have 3 mugs!\n",
+      "We have 2 hats!\n",
+      "We have 1 books!\n",
+      "We have 4 keychains!\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Enter the price of mug :  6\n",
+      "Enter the price of keychain :  3\n",
+      "Enter the price of book :  17\n",
+      "Enter the price of hat :  12\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Total price:38.00 €\n"
+     ]
+    }
+   ],
+   "source": [
+    "inventory = initialize_inventory(products)\n",
+    "customer_orders = get_customer_orders(inventory)\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",
+    "calculate_total_price()"
+   ]
   }
  ],
  "metadata": {
@@ -90,7 +244,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.12.4"
   }
  },
  "nbformat": 4,