diff --git a/lab-python-data-structures.ipynb b/lab-python-data-structures.ipynb
index 5b3ce9e0..15cf1dde 100644
--- a/lab-python-data-structures.ipynb
+++ b/lab-python-data-structures.ipynb
@@ -6,7 +6,8 @@
     "tags": []
    },
    "source": [
-    "# Lab | Data Structures "
+    "# Lab 01 | Data Structures\n",
+    "----"
    ]
   },
   {
@@ -50,11 +51,716 @@
     "\n",
     "Solve the exercise by implementing the steps using the Python concepts of lists, dictionaries, sets, and basic input/output operations. "
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "----\n",
+    "# Solved Lab 01 | Data Structures"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "----\n",
+    "#### 1. Define a list called `products` that contains the following items: \"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\". "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['t-shirt', 'mug', 'hat', 'book', 'keychain']\n"
+     ]
+    }
+   ],
+   "source": [
+    "# define list products\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "print(products)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#### 2. Create an empty dictionary called `inventory`\n",
+    "-----"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{}\n"
+     ]
+    }
+   ],
+   "source": [
+    "# create empty dict inventory\n",
+    "inventory = {}\n",
+    "print(inventory)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "-----\n",
+    "#### 3. Ask the user to input the quantity of each product available in the inventory. \n",
+    "Use the product names from the `products` list as keys in the `inventory` dictionary and assign the respective quantities as values."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Before updating the inventory: {}\n",
+      "\n",
+      "Products quantities input:\n",
+      "- t-shirt quantity updated to 20.\n",
+      "- mug quantity updated to 30.\n",
+      "- hat quantity updated to 40.\n",
+      "- book quantity updated to 1.\n",
+      "- keychain quantity updated to 2.\n",
+      "\n",
+      "Updated Inventory: {'t-shirt': 20, 'mug': 30, 'hat': 40, 'book': 1, 'keychain': 2}\n"
+     ]
+    }
+   ],
+   "source": [
+    "#3. user inputs the quantity of each product available in the inventory:\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "inventory = {}\n",
+    "print(\"Before updating the inventory:\", inventory)\n",
+    "print(\"\\nProducts quantities input:\")\n",
+    "\n",
+    "for product in products:\n",
+    "    quantity = int(input(f\"Enter the quantity for {product}: \"))\n",
+    "    inventory[product] = quantity\n",
+    "    print(f\"- {product} quantity updated to {quantity}.\")\n",
+    "print(\"\\nUpdated Inventory:\", inventory)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "----\n",
+    "##### Error handling the input"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{}\n",
+      "{'t-shirt': 10, 'mug': 20, 'hat': 30, 'book': 40, 'keychain': 50}\n"
+     ]
+    }
+   ],
+   "source": [
+    "# 3. input of the user for quantity of each product\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "inventory = {}\n",
+    "print(inventory)\n",
+    "\n",
+    "for i in range(len(products)):\n",
+    "    while True:  # keep asking until valid\n",
+    "        quantity = input(\"Enter the quantity for \" + products[i] + \": \")\n",
+    "        if quantity.isdigit():           # checks if input is a positive integer\n",
+    "            quantity = int(quantity)\n",
+    "            inventory[products[i]] = quantity\n",
+    "            break                        # valid → exit loop\n",
+    "        else:\n",
+    "            print(f\"❌ Invalid input! Please enter a numeric quantity for {products[i]}.\")\n",
+    "\n",
+    "# 3.5 checking our dictionary inventory\n",
+    "print(inventory)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "-----\n",
+    "#### 4. Create an empty set called `customer_orders`."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "set()\n"
+     ]
+    }
+   ],
+   "source": [
+    "# create empty set for customer orders\n",
+    "customer_orders = set()\n",
+    "print(customer_orders)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "-----\n",
+    "#### 5. Ask the user to input the name of three products that a customer wants to order (from those in the products list, meaning three products out of \"t-shirt\", \"mug\", \"hat\", \"book\" or \"keychain\". Add each product name to the `customer_orders` set."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Here are the available products : ['t-shirt', 'mug', 'hat', 'book', 'keychain']\n",
+      "\n",
+      " Empty Customer's orders: set()\n",
+      "Error! Please input product from the list:  ['t-shirt', 'mug', 'hat', 'book', 'keychain']\n",
+      "- t-shirt has been added to your order!\n",
+      "- book has been added to your order!\n",
+      "\n",
+      "Updated Customer's orders: {'book', 't-shirt'}\n"
+     ]
+    }
+   ],
+   "source": [
+    "# 5. Ask the user to input 3 product names to add to a set called `customers_orders`.----------------\n",
+    "# define list products\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "print(\"Here are the available products :\", products)\n",
+    "\n",
+    "# Empty customer orders set for testing\n",
+    "customer_orders = set()\n",
+    "print(\"\\n Empty Customer's orders:\", customer_orders)\n",
+    "\n",
+    "# INPUT 3 PRODUCTS using loop\n",
+    "for i in range(3):\n",
+    "\n",
+    "    product = input(\"Enter product name: \").lower()  # convert input to lowercase\n",
+    "    if product in products:\n",
+    "        print(f\"- {product} has been added to your order!\")\n",
+    "        customer_orders.add(product)\n",
+    "    else:\n",
+    "        print(\"Error! Please input product from the list: \", products)\n",
+    "        continue # skip to next iteration if product not in list\n",
+    "    \n",
+    "\n",
+    "# updated customer orders set with products for testing\n",
+    "print(\"\\nUpdated Customer's orders:\", customer_orders)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Here are the available products : ['t-shirt', 'mug', 'hat', 'book', 'keychain']\n",
+      "\n",
+      " Empty Customer's orders: set() \n",
+      "\n",
+      "Thank you for your purchase!\n",
+      "\n",
+      "Updated Customer's orders: set()\n"
+     ]
+    }
+   ],
+   "source": [
+    "# 5. using while instead of for loop---------------------------------------------------------------------------------\n",
+    "# unlimited adding of products until We enter 'BUY'\n",
+    "# define list products\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "print(\"Here are the available products :\", products)\n",
+    "\n",
+    "# Empty customer orders set for testing\n",
+    "customer_orders = set()\n",
+    "print(\"\\n Empty Customer's orders:\", customer_orders, \"\\n\")\n",
+    "\n",
+    "# must initialize product variable before while loop\n",
+    "product = \"\"\n",
+    "# INPUT 3 PRODUCTS using loop\n",
+    "while product !=\"buy\": # keep asking for product input until we write buy\n",
+    "\n",
+    "    product = input(\"Enter product name or BUY to complete your purchase: \").lower()  # convert input to lowercase\n",
+    "    if product in products:\n",
+    "        print(f\"- {product} has been added to your order!\")\n",
+    "        customer_orders.add(product)\n",
+    "    \n",
+    "    elif product == \"buy\":\n",
+    "        print(\"Thank you for your purchase!\")\n",
+    "        break\n",
+    "\n",
+    "    else:\n",
+    "        print(f\"Error! {product} is not listed in our products list. Please input product from the list: {products}\")\n",
+    "        continue # skip to next iteration if product not in list\n",
+    "    \n",
+    "\n",
+    "# updated customer orders set with products for testing\n",
+    "print(\"\\nUpdated Customer's orders:\", customer_orders)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Here are the available products : ['t-shirt', 'mug', 'hat', 'book', 'keychain']\n",
+      "\n",
+      " Empty Customer's orders: set() \n",
+      "\n",
+      "Error! tshirt is not listed in our products list. Please input product from the list: ['t-shirt', 'mug', 'hat', 'book', 'keychain']\n",
+      "Error! tshirt is not listed in our products list. Please input product from the list: ['t-shirt', 'mug', 'hat', 'book', 'keychain']\n",
+      "Error! boook is not listed in our products list. Please input product from the list: ['t-shirt', 'mug', 'hat', 'book', 'keychain']\n",
+      "Error! boooook is not listed in our products list. Please input product from the list: ['t-shirt', 'mug', 'hat', 'book', 'keychain']\n",
+      "- book has been added to your order!\n",
+      "- mug has been added to your order!\n",
+      "- hat has been added to your order!\n",
+      "\n",
+      "Updated Customer's orders: {'book', 'hat', 'mug'}\n"
+     ]
+    }
+   ],
+   "source": [
+    "# 5. using while instead of for loop---------------------------------------------------------------------------------\n",
+    "# limited adding of only 3 products until We enter 'BUY'\n",
+    "# define list products\n",
+    "products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "print(\"Here are the available products :\", products)\n",
+    "\n",
+    "# Empty customer orders set for testing\n",
+    "customer_orders = set()\n",
+    "print(\"\\n Empty Customer's orders:\", customer_orders, \"\\n\")\n",
+    "\n",
+    "# must initialize product variable before while loop\n",
+    "product = \"\"\n",
+    "product_nb = 0\n",
+    "# INPUT 3 PRODUCTS using loop\n",
+    "while product !=\"buy\" and product_nb<3: # keep asking for product input until we write buy\n",
+    "\n",
+    "    product = input(\"Enter product name or BUY to complete your purchase: \").lower()  # convert input to lowercase\n",
+    "    if product in products:\n",
+    "        print(f\"- {product} has been added to your order!\")\n",
+    "        customer_orders.add(product)\n",
+    "        product_nb+=1\n",
+    "    \n",
+    "    elif product == \"buy\":\n",
+    "        print(\"Thank you for your purchase!\")\n",
+    "        break\n",
+    "\n",
+    "    else:\n",
+    "        print(f\"Error! {product} is not listed in our products list. Please input product from the list: {products}\")\n",
+    "        continue # skip to next iteration if product not in list\n",
+    "    \n",
+    "\n",
+    "# updated customer orders set with products for testing\n",
+    "print(\"\\nUpdated Customer's orders:\", customer_orders)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "-----\n",
+    "#### 6. Print the products in the `customer_orders` set"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "Updated Customer's orders: {'book', 'hat', 'mug'}\n"
+     ]
+    }
+   ],
+   "source": [
+    "# 6. printing the Updated Customer's orders: ----------------------------------------------------------------\n",
+    "print(\"\\nUpdated Customer's orders:\", customer_orders)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "-----\n",
+    "#### 7. Calculate the following order statistics:\n",
+    "   - Total Products Ordered: The total number of products in the `customer_orders` set.\n",
+    "   - Percentage of Products Ordered: The percentage of products ordered compared to the total available products.\n",
+    "   \n",
+    "   Store these statistics in a tuple called `order_status`."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "Total Products Ordered: 3\n",
+      "Percentage of Products Ordered: 60.00%\n",
+      "Order Status (Total Products Ordered, Percentage): (3, 60.0)\n"
+     ]
+    }
+   ],
+   "source": [
+    "# 7. Calculate the following order statistics: ------------------------------------------------------------\n",
+    "# 7.1. Total products ordered\n",
+    "\n",
+    "total_products_ordered = len(customer_orders)\n",
+    "print(f\"\\nTotal Products Ordered: {total_products_ordered}\")\n",
+    "\n",
+    "# 7.2. Percentage products ordered from total products ordered\n",
+    "percentage = total_products_ordered / len(products) * 100\n",
+    "\n",
+    "print(f\"Percentage of Products Ordered: {percentage:.2f}%\")\n",
+    "\n",
+    "# Store these statistics in a tuple called `order_status`.\n",
+    "\n",
+    "order_status = (total_products_ordered, percentage)\n",
+    "print(\"Order Status (Total Products Ordered, Percentage):\", order_status)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "-----\n",
+    "#### 8. Print the order statistics using the following format:\n",
+    "   ```\n",
+    "   Order Statistics:\n",
+    "   Total Products Ordered: <total_products_ordered>\n",
+    "   Percentage of Products Ordered: <percentage_ordered>% \n",
+    "   ```"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "Order Statistics:\n",
+      "Total Products Ordered: 3\n",
+      "Percentage of Products Ordered: 60.00% \n"
+     ]
+    }
+   ],
+   "source": [
+    "# 8. Storing the statistics in a tuple order_status\n",
+    "\n",
+    "# Print the order statistics using the following format--------------------\n",
+    "\n",
+    "# Order Statistics:\n",
+    "print(\"\\nOrder Statistics:\")\n",
+    "\n",
+    "# Total Products Ordered: <total_products_ordered>\n",
+    "print(f\"Total Products Ordered: {total_products_ordered}\")\n",
+    "\n",
+    "# Percentage of Products Ordered: <percentage_ordered>% \n",
+    "print(f\"Percentage of Products Ordered: {percentage:.2f}% \")\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "-----\n",
+    "#### 9. Update the inventory by subtracting 1 from the quantity of each product. Modify the `inventory` dictionary accordingly."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 19,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "- book inventory decreased by 1. New quantity: 4\n",
+      "- hat inventory decreased by 1. New quantity: 3\n",
+      "- mug inventory decreased by 1. New quantity: 2\n"
+     ]
+    }
+   ],
+   "source": [
+    "# 9. Update the inventory dict by substracting 1 from products in customer_orders set ---------------------------------------------\n",
+    "for product in customer_orders:\n",
+    "    if inventory[product] > 0:\n",
+    "        inventory[product] -= 1\n",
+    "        print(f\"- {product} inventory decreased by 1. New quantity: {inventory[product]}\")\n",
+    "    else:\n",
+    "        print(f\"- {product} is out of stock!\")\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "-----\n",
+    "#### 10. Print the updated inventory, displaying the quantity of each product on separate lines."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "Updated Inventory after Customer's orders: {'t-shirt': 3, 'mug': 2, 'hat': 3, 'book': 4, 'keychain': 5}\n",
+      "\n",
+      "Updated Inventory after Customer's orders:\n",
+      "- t-shirt: 3 units left\n",
+      "- mug: 2 units left\n",
+      "- hat: 3 units left\n",
+      "- book: 4 units left\n",
+      "- keychain: 5 units left\n",
+      "\n",
+      "Updated Inventory after Customer's orders:\n",
+      "- t-shirt: 3 units left\n",
+      "- mug: 2 units left\n",
+      "- hat: 3 units left\n",
+      "- book: 4 units left\n",
+      "- keychain: 5 units left\n"
+     ]
+    }
+   ],
+   "source": [
+    "# Print the updated inventory\n",
+    "\n",
+    "# print way 1: call dict\n",
+    "print(\"\\nUpdated Inventory after Customer's orders:\", inventory)\n",
+    "\n",
+    "# print way 2: bullet points using key[i]\n",
+    "print(\"\\nUpdated Inventory after Customer's orders:\")\n",
+    "for product in products:\n",
+    "    print(f\"- {product}: {inventory[product]} units left\")\n",
+    "\n",
+    "# print way 3: using items()\n",
+    "print(\"\\nUpdated Inventory after Customer's orders:\")\n",
+    "for product, quantity in inventory.items():\n",
+    "    print(f\"- {product}: {quantity} units left\")\n",
+    "\n",
+    "# for key, value in dictionary.items():\n",
+    "#     print(f\"{key}: {value}\")\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "-----\n",
+    "# ***HOW TO ?***"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##### How to print the updated dict using `for` loop AND `get()`"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "dict_name = { 'key' : 'value'}\n",
+    "for key in dict_name.keys():\n",
+    "    print(f\"{key}: {key.get()}\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##### How to print the updated dict using `for` loop AND `items()`"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "for key, value in dict_name.items():\n",
+    "    print(f\"{key}: {value}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Different Ways to write mathematical operations----------------------------- \n",
+    "# Subtraction\n",
+    "x -= 1\n",
+    "x  = x - 1\n",
+    "\n",
+    "# Addition\n",
+    "x += 1\n",
+    "x  = x + 1\n",
+    "\n",
+    "# Division\n",
+    "x /= 1\n",
+    "x  = x / 1\n",
+    "\n",
+    "# Multiplication\n",
+    "x *= 1\n",
+    "x  = x * 1\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##### How to define EMPTY different data structures in Python :"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "set_name = set()\n",
+    "list_name = []\n",
+    "dict_name = {}\n",
+    "tuple_name = {}"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##### How to add to an EMPTY data Structure:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "variable = 'whatever'\n",
+    "# How to add to a set\n",
+    "set_name.add(variable)\n",
+    "\n",
+    "# How to add to a list\n",
+    "list_name.append(variable)\n",
+    "\n",
+    "# How to add to a dict\n",
+    "# missing\n",
+    "# How to add to a tuple\n",
+    "# missing"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##### How to input into an empty set"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# customer orders empty set\n",
+    "customer_orders = set()\n",
+    "print(\"\\nCustomer's orders:\", customer_orders)\n",
+    "\n",
+    "# INPUT 3 PRODUCTS using loop\n",
+    "print(range(3))\n",
+    "for i in range(3):\n",
+    "    product = input(\"Enter product name: \")\n",
+    "    print(f\"- {product}\")\n",
+    "    customer_orders.add(product)\n",
+    "\n",
+    "# customer orders set with products\n",
+    "print(\"\\nCustomer's orders:\", customer_orders)\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# input 1 product\n",
+    "product = input(\"Enter product name: \")\n",
+    "\n",
+    "# INPUT 3 PRODUCTS using loop\n",
+    "print(range(3))\n",
+    "for i in range(3):\n",
+    "    print(\"Line number :\", i)\n"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -68,7 +774,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.5"
   }
  },
  "nbformat": 4,