diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..ca1a598 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -72,11 +72,105 @@
     "\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": 39,
+   "id": "464b1353",
+   "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": null,
+   "id": "b4154ae6",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def calculate_total_price(customer_orders): \n",
+    "   total_price = 0.0\n",
+    "   for product in customer_orders:\n",
+    "        valid_input = False\n",
+    "        while not valid_input:\n",
+    "            try:\n",
+    "                entry = input(f\"Enter the price of {product}: \")\n",
+    "                price = float(entry)\n",
+    "                if price < 0:\n",
+    "                  raise ValueError(\"Price cannot be negative. Please enter a valid price.\")\n",
+    "                total_price += price\n",
+    "                valid_input = True\n",
+    "            except ValueError:\n",
+    "             print(f\"Error: '{entry}' is not a valid number. Please try again.\")\n",
+    "             print (f\"Error: '{price}' cannot be negative. Please enter a valid price.\") \n",
+    "   return total_price"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "c568692b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_customer_orders(inventory):\n",
+    "    while True:\n",
+    "        try:\n",
+    "            orders_count = int(input(\"Enter the number of customer orders: \"))\n",
+    "            if orders_count < 0:\n",
+    "                raise ValueError(\"The number of orders cannot be negative.\")\n",
+    "            break\n",
+    "        except ValueError as e:\n",
+    "            print(f\"Error: {e} Please enter a valid integer.\")\n",
+    "\n",
+    "    customer_orders = {}\n",
+    "    for i in range(orders_count):\n",
+    "        while True:\n",
+    "            try:\n",
+    "                product_name = input(f\"Gather the name for product {i + 1}: \")\n",
+    "                if product_name not in inventory:\n",
+    "                    raise ValueError(f\"'{product_name}' does not exist in our catalog.\")\n",
+    "                already_ordered = customer_orders.get(product_name, 0)\n",
+    "                if inventory[product_name] <= already_ordered:\n",
+    "                    raise ValueError(f\"'{product_name}' is currently out of stock or insufficient units.\")\n",
+    "                break\n",
+    "            except ValueError as e:\n",
+    "                print(f\"Error: {e} Please try again.\")\n",
+    "\n",
+    "    return customer_orders\n",
+    "\n",
+    "                \n",
+    "\n",
+    "   "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "fa19394e",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -90,7 +184,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.9"
   }
  },
  "nbformat": 4,