diff --git a/format_strings.ipynb b/format_strings.ipynb
new file mode 100644
index 0000000..26688c5
--- /dev/null
+++ b/format_strings.ipynb
@@ -0,0 +1,248 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "c23452f9-f689-420e-b170-ee9b8b08e1d0",
+   "metadata": {},
+   "source": [
+    "# F String"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "d453e396-0588-4982-b254-75add9a0cc08",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The price is 73.75 dollars\n"
+     ]
+    }
+   ],
+   "source": [
+    "price = 59\n",
+    "tax = 0.25\n",
+    "txt = f\"The price is {price + (price * tax)} dollars\"\n",
+    "print(txt)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "273f9c04-aeb7-48d5-ba49-06c24f5a7651",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "It is very Cheap\n"
+     ]
+    }
+   ],
+   "source": [
+    "price = 49\n",
+    "txt = f\"It is very {'Expensive' if price>50 else 'Cheap'}\"\n",
+    "print(txt)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "fbe7e945-6ac1-4c71-8bd9-beb8f425d897",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "I love APPLES\n"
+     ]
+    }
+   ],
+   "source": [
+    "fruit = \"apples\"\n",
+    "txt = f\"I love {fruit.upper()}\"\n",
+    "print(txt)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "478b71c4-9b59-4cda-8b3e-3c1abccb731a",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The plane is flying at a 9144.0 meter altitude\n"
+     ]
+    }
+   ],
+   "source": [
+    "def myconverter(x):\n",
+    "    return x * 0.3048\n",
+    "\n",
+    "\n",
+    "txt = f\"The plane is flying at a {myconverter(30000)} meter altitude\"\n",
+    "print(txt)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "c053f887-73b5-4838-b42c-63e9d398c9b4",
+   "metadata": {},
+   "source": [
+    "# String format()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "becf51c2-f500-4d7f-b388-8bf17835e0eb",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The price is 49 dollars\n"
+     ]
+    }
+   ],
+   "source": [
+    "price = 49\n",
+    "txt = \"The price is {} dollars\"\n",
+    "print(txt.format(price))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "id": "e149e803-611a-4334-8b84-56463eebedb9",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "The price is 49.00 dollars\n"
+     ]
+    }
+   ],
+   "source": [
+    "txt = \"The price is {:.2f} dollars\"\n",
+    "print(txt.format(price))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "id": "dd616200-4c97-4654-80f1-d09efdc7c43e",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "I want 3 pieces of item number 567 for 49.00 dollars.\n"
+     ]
+    }
+   ],
+   "source": [
+    "quantity = 3\n",
+    "itemno = 567\n",
+    "price = 49\n",
+    "myorder = \"I want {} pieces of item number {} for {:.2f} dollars.\"\n",
+    "print(myorder.format(quantity, itemno, price))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "id": "aea41442-f091-4ff8-bde5-1001ec01061f",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "I want 3 pieces of item number 567 for 49.00 dollars.\n"
+     ]
+    }
+   ],
+   "source": [
+    "quantity = 3\n",
+    "itemno = 567\n",
+    "price = 49\n",
+    "myorder = \"I want {0} pieces of item number {1} for {2:.2f} dollars.\"\n",
+    "print(myorder.format(quantity, itemno, price))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "id": "b0a150cb-5420-4314-b21b-2e35a25dbb2d",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "His name is John. John is 36 years old.\n"
+     ]
+    }
+   ],
+   "source": [
+    "age = 36\n",
+    "name = \"John\"\n",
+    "txt = \"His name is {1}. {1} is {0} years old.\"\n",
+    "print(txt.format(age, name))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "id": "2481de45-9a9d-4e59-abac-65912698b6d9",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "I have a Ford, it is a Mustang.\n"
+     ]
+    }
+   ],
+   "source": [
+    "myorder = \"I have a {carname}, it is a {model}.\"\n",
+    "print(myorder.format(carname = \"Ford\", model = \"Mustang\"))"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.19"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}