diff --git a/lab-python-error-handling.ipynb b/lab-python-error-handling.ipynb
index f4c6ef6..0f3c477 100644
--- a/lab-python-error-handling.ipynb
+++ b/lab-python-error-handling.ipynb
@@ -72,13 +72,205 @@
     "\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": 1,
+   "id": "9ff88855-b8b6-46e7-972a-856507e94e13",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "Enter the quantity of t-shirts available:  5\n",
+      "Enter the quantity of mugs available:  5\n",
+      "Enter the quantity of hats available:  5\n",
+      "Enter the quantity of books available:  5\n",
+      "Enter the quantity of keychains available:  5\n"
+     ]
+    },
+    {
+     "data": {
+      "text/plain": [
+       "{'t-shirt': 5, 'mug': 5, 'hat': 5, 'book': 5, 'keychain': 5}"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\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",
+    "initialize_inventory(products)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "18bccc5d-b48a-4e79-b15d-bc47d14d7474",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "Enter the number of customer orders:  r\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Invalid input. Please enter a valid number.\n"
+     ]
+    },
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "Enter the number of customer orders:  -1\n"
+     ]
+    }
+   ],
+   "source": [
+    "def get_customer_orders():\n",
+    "    while True:\n",
+    "        try:\n",
+    "            customer_order_no = int(input(\"Enter the number of customer orders: \"))\n",
+    "\n",
+    "            if customer_order_no >= 0: \n",
+    "                list_of_items = [(input(f\"Enter the name of a product that a customer wants to order: \")) for i in range(customer_order_no)]\n",
+    "                return list_of_items\n",
+    "                \n",
+    "            elif customer_order_no < 0:\n",
+    "                pass\n",
+    "                \n",
+    "        except ValueError:\n",
+    "            print(\"Invalid input. Please enter a valid number.\")\n",
+    "    \n",
+    "    \n",
+    "\n",
+    "list_of_items = get_customer_orders()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "7800e76a-f74a-475f-a608-c8d3276d1212",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['mug', 'book']"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "list_of_items"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "646405ba-6afa-4893-90d0-f040cb494b41",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_customer_orders():\n",
+    "    while True:\n",
+    "        try:\n",
+    "            customer_order_no = int(input(\"Enter the number of customer orders: \"))\n",
+    "\n",
+    "            if customer_order_no >= 0:\n",
+    "                list_of_items = [\n",
+    "                    input(\"Enter the name of a product that a customer wants to order: \")\n",
+    "                    for i in range(customer_order_no)\n",
+    "                ]\n",
+    "                return list_of_items\n",
+    "\n",
+    "            else:\n",
+    "                print(\"Number of orders cannot be negative.\")\n",
+    "\n",
+    "        except ValueError:\n",
+    "            print(\"Invalid input. Please enter a valid number.\")\n",
+    "\n",
+    "list_of_items = get_customer_orders()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "73786c2d-ccc4-409a-ac4d-e0c79bc9b869",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def total_price(list_of_items):\n",
+    "    total = 0\n",
+    "    for item in list_of_items:\n",
+    "        while True:\n",
+    "            try:\n",
+    "                price = int(input(f\"Enter the price for the {item}: \"))\n",
+    "            \n",
+    "                if price >= 0:\n",
+    "                    total += price\n",
+    "                    break # You need this to move on to the next item\n",
+    "                else:\n",
+    "                    print(\"Price cannot be negative. Please enter a valid price.\")\n",
+    "            except ValueError:\n",
+    "                print(\"Invalid input. Please enter a valid number.\")\n",
+    "    \n",
+    "    print(\"The total price is \", total)\n",
+    "    return total\n",
+    "\n",
+    "total_price(list_of_items)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "ebc64977-09c1-4712-89fd-02ec599890ee",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "bb189163-c18a-4fb5-bfeb-14d2aee3dcb3",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python [conda env:base] *",
    "language": "python",
-   "name": "python3"
+   "name": "conda-base-py"
   },
   "language_info": {
    "codemirror_mode": {
@@ -90,7 +282,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.9"
   }
  },
  "nbformat": 4,