diff --git a/your-code/main.ipynb b/your-code/main.ipynb
index f3bde01..5fcf8c3 100644
--- a/your-code/main.ipynb
+++ b/your-code/main.ipynb
@@ -24,11 +24,15 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 73,
    "id": "630d7e4d",
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "import math\n",
+    "import random\n",
+    "import os\n"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -44,7 +48,51 @@
    "cell_type": "markdown",
    "id": "1207cb2c",
    "metadata": {},
-   "source": []
+   "source": [
+    "\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "id": "5afbd685",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[1,\n",
+       " 4,\n",
+       " 9,\n",
+       " 16,\n",
+       " 25,\n",
+       " 36,\n",
+       " 49,\n",
+       " 64,\n",
+       " 81,\n",
+       " 100,\n",
+       " 121,\n",
+       " 144,\n",
+       " 169,\n",
+       " 196,\n",
+       " 225,\n",
+       " 256,\n",
+       " 289,\n",
+       " 324,\n",
+       " 361,\n",
+       " 400]"
+      ]
+     },
+     "execution_count": 11,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "square = [i * i for i  in range(1,21)]\n",
+    "\n",
+    "square\n"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -59,11 +107,125 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 22,
    "id": "c047115a",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[1,\n",
+       " 4,\n",
+       " 9,\n",
+       " 16,\n",
+       " 25,\n",
+       " 36,\n",
+       " 49,\n",
+       " 64,\n",
+       " 81,\n",
+       " 100,\n",
+       " 121,\n",
+       " 144,\n",
+       " 169,\n",
+       " 196,\n",
+       " 225,\n",
+       " 256,\n",
+       " 289,\n",
+       " 324,\n",
+       " 361,\n",
+       " 400,\n",
+       " 441,\n",
+       " 484,\n",
+       " 529,\n",
+       " 576,\n",
+       " 625,\n",
+       " 676,\n",
+       " 729,\n",
+       " 784,\n",
+       " 841,\n",
+       " 900,\n",
+       " 961,\n",
+       " 1024,\n",
+       " 1089,\n",
+       " 1156,\n",
+       " 1225,\n",
+       " 1296,\n",
+       " 1369,\n",
+       " 1444,\n",
+       " 1521,\n",
+       " 1600,\n",
+       " 1681,\n",
+       " 1764,\n",
+       " 1849,\n",
+       " 1936,\n",
+       " 2025,\n",
+       " 2116,\n",
+       " 2209,\n",
+       " 2304,\n",
+       " 2401,\n",
+       " 2500,\n",
+       " 2601,\n",
+       " 2704,\n",
+       " 2809,\n",
+       " 2916,\n",
+       " 3025,\n",
+       " 3136,\n",
+       " 3249,\n",
+       " 3364,\n",
+       " 3481,\n",
+       " 3600,\n",
+       " 3721,\n",
+       " 3844,\n",
+       " 3969,\n",
+       " 4096,\n",
+       " 4225,\n",
+       " 4356,\n",
+       " 4489,\n",
+       " 4624,\n",
+       " 4761,\n",
+       " 4900,\n",
+       " 5041,\n",
+       " 5184,\n",
+       " 5329,\n",
+       " 5476,\n",
+       " 5625,\n",
+       " 5776,\n",
+       " 5929,\n",
+       " 6084,\n",
+       " 6241,\n",
+       " 6400,\n",
+       " 6561,\n",
+       " 6724,\n",
+       " 6889,\n",
+       " 7056,\n",
+       " 7225,\n",
+       " 7396,\n",
+       " 7569,\n",
+       " 7744,\n",
+       " 7921,\n",
+       " 8100,\n",
+       " 8281,\n",
+       " 8464,\n",
+       " 8649,\n",
+       " 8836,\n",
+       " 9025,\n",
+       " 9216,\n",
+       " 9409,\n",
+       " 9604,\n",
+       " 9801,\n",
+       " 10000]"
+      ]
+     },
+     "execution_count": 22,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "sqrt = [i * i for i in range(1, 101)]\n",
+    "\n",
+    "sqrt"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -77,11 +239,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 24,
    "id": "e23d87ea",
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "my_list = [x for x in range(-10, 1)]"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -95,11 +259,74 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 26,
    "id": "d8d1c865",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[1,\n",
+       " 3,\n",
+       " 5,\n",
+       " 7,\n",
+       " 9,\n",
+       " 11,\n",
+       " 13,\n",
+       " 15,\n",
+       " 17,\n",
+       " 19,\n",
+       " 21,\n",
+       " 23,\n",
+       " 25,\n",
+       " 27,\n",
+       " 29,\n",
+       " 31,\n",
+       " 33,\n",
+       " 35,\n",
+       " 37,\n",
+       " 39,\n",
+       " 41,\n",
+       " 43,\n",
+       " 45,\n",
+       " 47,\n",
+       " 49,\n",
+       " 51,\n",
+       " 53,\n",
+       " 55,\n",
+       " 57,\n",
+       " 59,\n",
+       " 61,\n",
+       " 63,\n",
+       " 65,\n",
+       " 67,\n",
+       " 69,\n",
+       " 71,\n",
+       " 73,\n",
+       " 75,\n",
+       " 77,\n",
+       " 79,\n",
+       " 81,\n",
+       " 83,\n",
+       " 85,\n",
+       " 87,\n",
+       " 89,\n",
+       " 91,\n",
+       " 93,\n",
+       " 95,\n",
+       " 97,\n",
+       " 99]"
+      ]
+     },
+     "execution_count": 26,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "odds = [i for i in range(1, 101) if i %2 == 1 ]\n",
+    "odds"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -112,11 +339,1025 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 28,
    "id": "6a9cfb8c",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[1,\n",
+       " 2,\n",
+       " 3,\n",
+       " 4,\n",
+       " 5,\n",
+       " 6,\n",
+       " 7,\n",
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+       " 10,\n",
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+       " 12,\n",
+       " 13,\n",
+       " 14,\n",
+       " 15,\n",
+       " 16,\n",
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+       " 25,\n",
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+       " 819,\n",
+       " 820,\n",
+       " 821,\n",
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+       " 841,\n",
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+       " 850,\n",
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+       " 854,\n",
+       " 855,\n",
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+       " 888,\n",
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+       " 900,\n",
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+       " 911,\n",
+       " 912,\n",
+       " 913,\n",
+       " 914,\n",
+       " 915,\n",
+       " 916,\n",
+       " 917,\n",
+       " 918,\n",
+       " 919,\n",
+       " 920,\n",
+       " 921,\n",
+       " 922,\n",
+       " 923,\n",
+       " 924,\n",
+       " 925,\n",
+       " 926,\n",
+       " 927,\n",
+       " 928,\n",
+       " 929,\n",
+       " 930,\n",
+       " 931,\n",
+       " 932,\n",
+       " 933,\n",
+       " 934,\n",
+       " 935,\n",
+       " 936,\n",
+       " 937,\n",
+       " 938,\n",
+       " 939,\n",
+       " 940,\n",
+       " 941,\n",
+       " 942,\n",
+       " 943,\n",
+       " 944,\n",
+       " 945,\n",
+       " 946,\n",
+       " 947,\n",
+       " 948,\n",
+       " 949,\n",
+       " 950,\n",
+       " 951,\n",
+       " 952,\n",
+       " 953,\n",
+       " 954,\n",
+       " 955,\n",
+       " 956,\n",
+       " 957,\n",
+       " 958,\n",
+       " 959,\n",
+       " 960,\n",
+       " 961,\n",
+       " 962,\n",
+       " 963,\n",
+       " 964,\n",
+       " 965,\n",
+       " 966,\n",
+       " 967,\n",
+       " 968,\n",
+       " 969,\n",
+       " 970,\n",
+       " 971,\n",
+       " 972,\n",
+       " 973,\n",
+       " 974,\n",
+       " 975,\n",
+       " 976,\n",
+       " 977,\n",
+       " 978,\n",
+       " 979,\n",
+       " 980,\n",
+       " 981,\n",
+       " 982,\n",
+       " 983,\n",
+       " 984,\n",
+       " 985,\n",
+       " 986,\n",
+       " 987,\n",
+       " 988,\n",
+       " 989,\n",
+       " 990,\n",
+       " 991,\n",
+       " 992,\n",
+       " 993,\n",
+       " 994,\n",
+       " 995,\n",
+       " 996,\n",
+       " 997,\n",
+       " 998,\n",
+       " 999,\n",
+       " 1000]"
+      ]
+     },
+     "execution_count": 28,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "divisible_by_seven = [i for i in range(1, 1001) if i/7 ]\n",
+    "\n",
+    "divisible_by_seven"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -129,7 +1370,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 38,
    "id": "43b38bd3",
    "metadata": {},
    "outputs": [],
@@ -141,11 +1382,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 44,
    "id": "d5fc7426",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Fndllfthwrdsnstrngthtrmnsyllbc\n"
+     ]
+    }
+   ],
+   "source": [
+    "non_vowels = [i for i in teststring if i not in 'a, e, i, o, u']\n",
+    "non_vowels\n",
+    "\n",
+    "print(''.join(non_vowels))"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -160,11 +1414,27 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 67,
    "id": "3a43399c",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "TQBFJOTLD\n"
+     ]
+    }
+   ],
+   "source": [
+    "sentence = 'The Quick Brown Fox Jumped Over The Lazy Dog'\n",
+    "\n",
+    "capital_letters = [i for i in sentence if i.isupper()]\n",
+    "\n",
+    "capital_letters\n",
+    "\n",
+    "print(''.join(capital_letters))"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -179,11 +1449,26 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 70,
    "id": "3ddb68df",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Thequickbrownfoxjumpedoverthelazydog\n"
+     ]
+    }
+   ],
+   "source": [
+    "consonants = 'The quick brown fox jumped over the lazy dog'\n",
+    "\n",
+    "consonants = [i for i in consonants if i.isalpha()]\n",
+    "consonants\n",
+    "\n",
+    "print(''.join(consonants))"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -201,11 +1486,36 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 74,
    "id": "22bb13eb",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['.git',\n",
+       " '.gitignore',\n",
+       " 'cheatsheet',\n",
+       " 'datasets',\n",
+       " 'example',\n",
+       " 'faq-and-examples',\n",
+       " 'images',\n",
+       " 'README.md',\n",
+       " 'troubleshooting',\n",
+       " 'week-1',\n",
+       " 'week-2']"
+      ]
+     },
+     "execution_count": 74,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "extracts =  os.listdir('C:/Users/Marco/Desktop/IronHack/lectures')\n",
+    "\n",
+    "extracts"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -220,11 +1530,29 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 85,
    "id": "120b29bd",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[[15, 46, 36, 31, 21, 26, 87, 26, 66],\n",
+       " [66, 11, 32, 17, 71, 6, 35, 8, 1],\n",
+       " [50, 86, 95, 47, 97, 27, 80, 66, 79],\n",
+       " [60, 43, 78, 77, 41, 92, 100, 88, 76]]"
+      ]
+     },
+     "execution_count": 85,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "random_lists = [[random.randint(0, 100) for i in range(1, 10)] for x in range(4)]\n",
+    "\n",
+    "random_lists "
+   ]
   },
   {
    "cell_type": "markdown",
@@ -238,7 +1566,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 87,
    "id": "b3afebb7",
    "metadata": {},
    "outputs": [],
@@ -248,11 +1576,26 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 88,
    "id": "b6bcef37",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[1, 2, 3, 4, 5, 6, 7, 8, 9]"
+      ]
+     },
+     "execution_count": 88,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "flatten_list = [i for sublist in list_of_lists for i in sublist]\n",
+    "\n",
+    "flatten_list"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -267,7 +1610,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 89,
    "id": "7087f44e",
    "metadata": {},
    "outputs": [],
@@ -279,11 +1622,56 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 91,
    "id": "a932aff5",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['40',\n",
+       " '20',\n",
+       " '10',\n",
+       " '30',\n",
+       " '20',\n",
+       " '20',\n",
+       " '20',\n",
+       " '20',\n",
+       " '20',\n",
+       " '30',\n",
+       " '20',\n",
+       " '30',\n",
+       " '20',\n",
+       " '30',\n",
+       " '50',\n",
+       " '10',\n",
+       " '30',\n",
+       " '20',\n",
+       " '20',\n",
+       " '20',\n",
+       " '100',\n",
+       " '100',\n",
+       " '100',\n",
+       " '100',\n",
+       " '100',\n",
+       " '100',\n",
+       " '100',\n",
+       " '100',\n",
+       " '100',\n",
+       " '100',\n",
+       " '100']"
+      ]
+     },
+     "execution_count": 91,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "floats = [i for row in list_of_lists for i in row]\n",
+    "\n",
+    "floats"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -295,22 +1683,49 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 100,
    "id": "b5980ab4",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "ename": "TypeError",
+     "evalue": "unsupported operand type(s) for ** or pow(): 'str' and 'int'",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
+      "Cell \u001b[1;32mIn[100], line 3\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[38;5;28;01mfor\u001b[39;00m i \u001b[38;5;129;01min\u001b[39;00m [\u001b[38;5;124m'\u001b[39m\u001b[38;5;124ma\u001b[39m\u001b[38;5;124m'\u001b[39m,\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mb\u001b[39m\u001b[38;5;124m'\u001b[39m,\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mc\u001b[39m\u001b[38;5;124m'\u001b[39m]:\n\u001b[1;32m----> 3\u001b[0m     \u001b[38;5;28mprint\u001b[39m (i\u001b[38;5;241m*\u001b[39m\u001b[38;5;241m*\u001b[39m\u001b[38;5;241m2\u001b[39m)\n",
+      "\u001b[1;31mTypeError\u001b[0m: unsupported operand type(s) for ** or pow(): 'str' and 'int'"
+     ]
+    }
+   ],
    "source": [
     "for i in ['a','b','c']:\n",
-    "    print i**2"
+    "    \n",
+    "    print (i**2)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 99,
    "id": "3605fc78",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Error\n",
+      "Error\n",
+      "Error\n"
+     ]
+    }
+   ],
+   "source": [
+    "for i in ['a','b','c']:\n",
+    "    try: print (i**2)\n",
+    "    except: print(\"Error\")"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -326,10 +1741,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 101,
    "id": "441acd1c",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "ename": "ZeroDivisionError",
+     "evalue": "division by zero",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[1;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
+      "Cell \u001b[1;32mIn[101], line 4\u001b[0m\n\u001b[0;32m      1\u001b[0m x \u001b[38;5;241m=\u001b[39m \u001b[38;5;241m5\u001b[39m\n\u001b[0;32m      2\u001b[0m y \u001b[38;5;241m=\u001b[39m \u001b[38;5;241m0\u001b[39m\n\u001b[1;32m----> 4\u001b[0m z \u001b[38;5;241m=\u001b[39m x\u001b[38;5;241m/\u001b[39my\n",
+      "\u001b[1;31mZeroDivisionError\u001b[0m: division by zero"
+     ]
+    }
+   ],
    "source": [
     "x = 5\n",
     "y = 0\n",
@@ -339,11 +1766,27 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 114,
    "id": "976fec9f",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "you can't divide by zero\n",
+      "All done\n"
+     ]
+    }
+   ],
+   "source": [
+    "try:\n",
+    "    z = x/y\n",
+    "except ZeroDivisionError:\n",
+    "    print(\"you can't divide by zero\")\n",
+    "finally:\n",
+    "    print(\"All done\")"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -357,10 +1800,22 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 115,
    "id": "783a8224",
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "ename": "IndexError",
+     "evalue": "list index out of range",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[1;31mIndexError\u001b[0m                                Traceback (most recent call last)",
+      "Cell \u001b[1;32mIn[115], line 2\u001b[0m\n\u001b[0;32m      1\u001b[0m abc\u001b[38;5;241m=\u001b[39m[\u001b[38;5;241m10\u001b[39m,\u001b[38;5;241m20\u001b[39m,\u001b[38;5;241m20\u001b[39m]\n\u001b[1;32m----> 2\u001b[0m \u001b[38;5;28mprint\u001b[39m(abc[\u001b[38;5;241m3\u001b[39m])\n",
+      "\u001b[1;31mIndexError\u001b[0m: list index out of range"
+     ]
+    }
+   ],
    "source": [
     "abc=[10,20,20]\n",
     "print(abc[3])"
@@ -368,11 +1823,24 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 116,
    "id": "cfcf15f0",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "list index is out of range\n"
+     ]
+    }
+   ],
+   "source": [
+    "try:\n",
+    "    print(abc[3])\n",
+    "except IndexError:\n",
+    "    print(\"list index is out of range\")"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -388,11 +1856,32 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 129,
    "id": "3c1f141b",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Select a number to be divided by 10\n",
+      "select a number that divides d\n",
+      "please introduce only numbers\n"
+     ]
+    }
+   ],
+   "source": [
+    "x = input ('Select a number to be divided by ')\n",
+    "y =  input ('select a number that divides ')\n",
+    "\n",
+    "try: \n",
+    "    print(int(x)/int(y))\n",
+    "    \n",
+    "except ZeroDivisionError:\n",
+    "    print(\"You can't divide by zero\")\n",
+    "except ValueError:\n",
+    "    print(\"please introduce only numbers\")\n"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -406,7 +1895,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 126,
    "id": "b73f824c",
    "metadata": {},
    "outputs": [
@@ -415,25 +1904,41 @@
      "evalue": "[Errno 2] No such file or directory: 'testfile'",
      "output_type": "error",
      "traceback": [
-      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
-      "\u001b[0;31mFileNotFoundError\u001b[0m                         Traceback (most recent call last)",
-      "\u001b[0;32m<ipython-input-1-cd8832385d15>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mf\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mopen\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'testfile'\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;34m'r'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      2\u001b[0m \u001b[0mf\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mwrite\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'Test write this'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
-      "\u001b[0;31mFileNotFoundError\u001b[0m: [Errno 2] No such file or directory: 'testfile'"
+      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[1;31mFileNotFoundError\u001b[0m                         Traceback (most recent call last)",
+      "Cell \u001b[1;32mIn[126], line 1\u001b[0m\n\u001b[1;32m----> 1\u001b[0m f \u001b[38;5;241m=\u001b[39m \u001b[38;5;28mopen\u001b[39m(\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mtestfile\u001b[39m\u001b[38;5;124m'\u001b[39m,\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mr\u001b[39m\u001b[38;5;124m'\u001b[39m)\n\u001b[0;32m      2\u001b[0m f\u001b[38;5;241m.\u001b[39mwrite(\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mTest write this\u001b[39m\u001b[38;5;124m'\u001b[39m)\n",
+      "File \u001b[1;32m~\\miniconda3\\Lib\\site-packages\\IPython\\core\\interactiveshell.py:286\u001b[0m, in \u001b[0;36m_modified_open\u001b[1;34m(file, *args, **kwargs)\u001b[0m\n\u001b[0;32m    279\u001b[0m \u001b[38;5;28;01mif\u001b[39;00m file \u001b[38;5;129;01min\u001b[39;00m {\u001b[38;5;241m0\u001b[39m, \u001b[38;5;241m1\u001b[39m, \u001b[38;5;241m2\u001b[39m}:\n\u001b[0;32m    280\u001b[0m     \u001b[38;5;28;01mraise\u001b[39;00m \u001b[38;5;167;01mValueError\u001b[39;00m(\n\u001b[0;32m    281\u001b[0m         \u001b[38;5;124mf\u001b[39m\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mIPython won\u001b[39m\u001b[38;5;124m'\u001b[39m\u001b[38;5;124mt let you open fd=\u001b[39m\u001b[38;5;132;01m{\u001b[39;00mfile\u001b[38;5;132;01m}\u001b[39;00m\u001b[38;5;124m by default \u001b[39m\u001b[38;5;124m\"\u001b[39m\n\u001b[0;32m    282\u001b[0m         \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mas it is likely to crash IPython. If you know what you are doing, \u001b[39m\u001b[38;5;124m\"\u001b[39m\n\u001b[0;32m    283\u001b[0m         \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124myou can use builtins\u001b[39m\u001b[38;5;124m'\u001b[39m\u001b[38;5;124m open.\u001b[39m\u001b[38;5;124m\"\u001b[39m\n\u001b[0;32m    284\u001b[0m     )\n\u001b[1;32m--> 286\u001b[0m \u001b[38;5;28;01mreturn\u001b[39;00m io_open(file, \u001b[38;5;241m*\u001b[39margs, \u001b[38;5;241m*\u001b[39m\u001b[38;5;241m*\u001b[39mkwargs)\n",
+      "\u001b[1;31mFileNotFoundError\u001b[0m: [Errno 2] No such file or directory: 'testfile'"
      ]
     }
    ],
    "source": [
     "f = open('testfile','r')\n",
-    "f.write('Test write this')"
+    "f.write('Test write this')\n",
+    "\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 130,
    "id": "5a1cb361",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "ename": "SyntaxError",
+     "evalue": "expected 'except' or 'finally' block (2332520272.py, line 2)",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;36m  Cell \u001b[1;32mIn[130], line 2\u001b[1;36m\u001b[0m\n\u001b[1;33m    f.write('Test write this')\u001b[0m\n\u001b[1;37m    ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m expected 'except' or 'finally' block\n"
+     ]
+    }
+   ],
+   "source": [
+    "try: f = open('testfile','r')\n",
+    "f.write('Test write this')\n",
+    "except fileNotFoundError:\n",
+    "    print(\"no such file  or directory\")"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -447,16 +1952,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 131,
    "id": "5f639ab1",
    "metadata": {},
    "outputs": [
     {
      "ename": "IndentationError",
-     "evalue": "unexpected indent (<ipython-input-2-f4ec7bf448fd>, line 2)",
+     "evalue": "unexpected indent (1269636024.py, line 2)",
      "output_type": "error",
      "traceback": [
-      "\u001b[0;36m  File \u001b[0;32m\"<ipython-input-2-f4ec7bf448fd>\"\u001b[0;36m, line \u001b[0;32m2\u001b[0m\n\u001b[0;31m    line = f.readline()\u001b[0m\n\u001b[0m    ^\u001b[0m\n\u001b[0;31mIndentationError\u001b[0m\u001b[0;31m:\u001b[0m unexpected indent\n"
+      "\u001b[1;36m  Cell \u001b[1;32mIn[131], line 2\u001b[1;36m\u001b[0m\n\u001b[1;33m    line = f.readline()\u001b[0m\n\u001b[1;37m    ^\u001b[0m\n\u001b[1;31mIndentationError\u001b[0m\u001b[1;31m:\u001b[0m unexpected indent\n"
      ]
     }
    ],
@@ -466,6 +1971,31 @@
     "    i = int(s.strip())\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 135,
+   "id": "67c81971",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "myfile.txt not found\n"
+     ]
+    }
+   ],
+   "source": [
+    "try:\n",
+    "    fp = open('myfile.txt')\n",
+    "    line = f.readline()\n",
+    "    i = int(s.strip())\n",
+    "except FileNotFoundError:\n",
+    "    print(\"myfile.txt not found\")\n",
+    "except ValueError:\n",
+    "    print(\"can't convert to int\")"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "d695245b",
@@ -507,11 +2037,29 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 134,
    "id": "1643bbed",
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Function can only run on Linux systems\n"
+     ]
+    }
+   ],
+   "source": [
+    "import sys\n",
+    "\n",
+    "def linux_interaction():\n",
+    "    try:\n",
+    "        assert ('linux' in sys.platform), \"This function can only run on Linux systems.\"\n",
+    "        print('Doing something.')\n",
+    "    except AssertionError:\n",
+    "        print(\"This function can only run on Linux systems\")\n",
+    "linux_interaction()"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -636,7 +2184,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.13"
+   "version": "3.11.4"
   },
   "toc": {
    "base_numbering": 1,