diff --git a/Data Type.ipynb b/Data Type.ipynb
index 84d7819..4a0f321 100644
--- a/Data Type.ipynb	
+++ b/Data Type.ipynb	
@@ -49,7 +49,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [
     {
@@ -58,7 +58,7 @@
        "0.5"
       ]
      },
-     "execution_count": 3,
+     "execution_count": 1,
      "metadata": {},
      "output_type": "execute_result"
     }
diff --git a/If-Else.ipynb b/If-Else.ipynb
index 0ff6130..09b4d08 100644
--- a/If-Else.ipynb
+++ b/If-Else.ipynb
@@ -77,10 +77,7 @@
     }
    ],
    "source": [
-    "if 1 > 2:\n",
-    "    print('first')\n",
-    "else:\n",
-    "    print('last')"
+    "p"
    ]
   },
   {
diff --git a/List.ipynb b/List.ipynb
index b093b36..7015b01 100644
--- a/List.ipynb
+++ b/List.ipynb
@@ -9,45 +9,82 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[1, 2, 3, 4, 5, 5, 6, 78, 88, 9]\n"
+     ]
+    }
+   ],
    "source": [
-    "[1,2,3]"
+    "a=[1,2,3,4,5,5,6,78,88,9]\n",
+    "print(a)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "['hi', 1, [1, 2]]"
+       "['hi', 1]"
       ]
      },
-     "execution_count": 2,
+     "execution_count": 3,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "['hi',1,[1,2]]"
+    "['hi',1]"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 5,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['a', 'b', 'c', 10]\n",
+      "['a', 'b', 'c', 10, 'Angshuman']\n",
+      "['a', 'b', 'c', 10, 'Angshuman', 'aaaaa']\n",
+      "['a', 'b', 'c', 10, 'Angshuman', 'aaaaa', 'bbb']\n",
+      "['a', 'b', 'c', 10, 'Angshuman', 'aaaaa', 'bbb', 'uuu']\n",
+      "['a', 'b', 'c', 10, 'Angshuman', 'aaaaa', 'bbb', 'uuu', 'nnn']\n",
+      "['a', 'b', 'c', 10, 'Angshuman', 'aaaaa', 'bbb', 'uuu', 'nnn', 'f']\n"
+     ]
+    }
+   ],
    "source": [
-    "my_list = ['a','b','c',10]"
+    "my_list = ['a','b','c',10]\n",
+    "print(my_list)\n",
+    "\n",
+    "my_list.append(\"Angshuman\")\n",
+    "print(my_list)\n",
+    "my_list.append('aaaaa')\n",
+    "print(my_list)\n",
+    "my_list.append('bbb')\n",
+    "print(my_list)\n",
+    "my_list.append('uuu')\n",
+    "print(my_list)\n",
+    "my_list.append('nnn')\n",
+    "print(my_list)\n",
+    "my_list.append('f')\n",
+    "print(my_list)\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -56,107 +93,115 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "['a', 'b', 'c', 10, 'd']"
+       "10"
       ]
      },
-     "execution_count": 5,
+     "execution_count": 9,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "my_list"
+    "my_list[3]"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "10"
+       "[1, 2, 3, 4, 5, 6, 7]"
       ]
      },
-     "execution_count": 6,
+     "execution_count": 11,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "my_list[3]"
+    "p=[1,2,3,4,5,6,7]\n",
+    "p"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
    "metadata": {},
    "outputs": [
     {
-     "data": {
-      "text/plain": [
-       "'b'"
-      ]
-     },
-     "execution_count": 7,
-     "metadata": {},
-     "output_type": "execute_result"
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[1, 2, 3, 4, 5, 6, 7, 1000]\n"
+     ]
     }
    ],
    "source": [
-    "my_list[1]"
+    "\n",
+    "p.append(1000)\n",
+    "print(p)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 14,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "['b', 'c', 10, 'd']"
+       "['b', 'c', 10, 'Angshuman', 'aaaaa', 'bbb']"
       ]
      },
-     "execution_count": 8,
+     "execution_count": 14,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "my_list[1:]"
+    "my_list[1:7]\n",
+    "\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 15,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "['a']"
+       "'f'"
       ]
      },
-     "execution_count": 9,
+     "execution_count": 15,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "my_list[:1]"
+    "my_list[-1]\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 22,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -165,16 +210,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
+   "execution_count": 23,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "['NEW', 'b', 'c', 10, 'd']"
+       "['NEW', 'b', 'c', 10, 'aaaaa', 'bbb', 'uuu', 'nnn', 'fff']"
       ]
      },
-     "execution_count": 12,
+     "execution_count": 23,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -185,25 +230,53 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": 25,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "11\n",
+      "22\n",
+      "33\n",
+      "[44, 55, [66, 77, 88]]\n",
+      "44\n",
+      "55\n",
+      "[66, 77, 88]\n",
+      "66\n",
+      "77\n",
+      "88\n"
+     ]
+    }
+   ],
    "source": [
-    "nest = [1,2,3,[4,5,['target','PYTHON']]]"
+    "nest = [11,22,33,[44,55,[66,77,88]]]\n",
+    "\n",
+    "print(nest[0])\n",
+    "print(nest[1])\n",
+    "print(nest[2])\n",
+    "print(nest[3])\n",
+    "print(nest[3][0])\n",
+    "print(nest[3][1])\n",
+    "print(nest[3][2])\n",
+    "print(nest[3][2][0])\n",
+    "print(nest[3][2][1])\n",
+    "print(nest[3][2][2])"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": 25,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "[4, 5, ['target', 'PYTHON']]"
+       "[4, 5]"
       ]
      },
-     "execution_count": 14,
+     "execution_count": 25,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -254,22 +327,27 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 43,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "['A', 'B', 'C']\n",
-      "['A', 'C']\n"
+      "['AAA', 'B', 'C', 'AAA']\n",
+      "['B', 'C', 'AAA']\n",
+      "['B', 'C']\n"
      ]
     }
    ],
    "source": [
-    "thislist = [\"A\", \"B\", \"C\"]\n",
+    "thislist = [\"AAA\", \"B\", \"C\",\"AAA\"]\n",
     "print(thislist)\n",
-    "thislist.remove(\"B\")\n",
+    "thislist.remove(\"AAA\")\n",
+    "print(thislist)\n",
+    "\n",
+    "del thislist[2]\n",
+    "\n",
     "print(thislist)"
    ]
   },
@@ -294,17 +372,26 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": 33,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "['apple', 'banana']\n"
+     ]
+    }
+   ],
    "source": [
     "thislist = [\"apple\", \"banana\", \"cherry\"]\n",
-    "del thislist"
+    "del thislist[2]\n",
+    "print(thislist)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 20,
+   "execution_count": 27,
    "metadata": {},
    "outputs": [
     {
@@ -342,7 +429,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 22,
+   "execution_count": 47,
    "metadata": {},
    "outputs": [
     {
@@ -361,7 +448,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 23,
+   "execution_count": 34,
    "metadata": {},
    "outputs": [
     {
@@ -405,19 +492,19 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 25,
+   "execution_count": 50,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "['a', 'b', 'c', 1, 2, 3]\n"
+      "['a', 'b', 'c', 1, 1, 2, 3]\n"
      ]
     }
    ],
    "source": [
-    "list1 = [\"a\", \"b\" , \"c\"]\n",
+    "list1 = [\"a\", \"b\" , \"c\",1]\n",
     "list2 = [1, 2, 3]\n",
     "\n",
     "list1.extend(list2)\n",
@@ -426,20 +513,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 26,
+   "execution_count": 38,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "['apple', 'banana']\n"
+      "apple\n",
+      "cherry\n",
+      "Hi\n",
+      "Hello\n",
+      "Stack\n",
+      "banana\n",
+      "[]\n"
      ]
     }
    ],
    "source": [
     "thislist = [\"apple\", \"banana\", \"cherry\"]\n",
-    "thislist.pop()\n",
+    "thislist.append(\"Hello\")\n",
+    "thislist.pop(0)\n",
+    "print(thislist.pop(1))\n",
+    "thislist.append(\"Hi\")\n",
+    "print(thislist.pop())\n",
+    "print(thislist.pop())\n",
+    "thislist.append(\"Stack\")\n",
+    "print(thislist.pop())\n",
+    "print(thislist.pop())\n",
     "print(thislist)"
    ]
   }
diff --git a/Loops.ipynb b/Loops.ipynb
index c7879a8..00f1ec1 100644
--- a/Loops.ipynb
+++ b/Loops.ipynb
@@ -9,46 +9,41 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [],
    "source": [
-    "seq = [1,2,3,4,5]"
+    "seq = [1,2]"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "1\n",
-      "2\n",
-      "3\n",
-      "4\n",
-      "5\n"
+      "1 Hello\n",
+      "2 Hello\n"
      ]
     }
    ],
    "source": [
-    "for item in seq:\n",
-    "    print(item)"
+    "for i in seq:\n",
+    "    print(str(i)+\" Hello\")"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Yep\n",
-      "Yep\n",
       "Yep\n",
       "Yep\n",
       "Yep\n"
@@ -62,52 +57,44 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 17,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "2\n",
-      "4\n",
-      "6\n",
-      "8\n",
-      "10\n"
+      "1 Hello\n",
+      "2 Hello\n",
+      "1 Hello\n",
+      "2 Hello\n"
      ]
     }
    ],
    "source": [
     "for jelly in seq:\n",
-    "    print(jelly+jelly)"
+    "    for i in seq:\n",
+    "        print(str(i)+\" Hello\")"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 14,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "i is: 1\n",
-      "i is: 1\n",
-      "i is: 2\n",
-      "i is: 2\n",
-      "i is: 3\n",
-      "i is: 3\n",
-      "i is: 4\n",
-      "i is: 4\n"
+      "i is: --- 4 \n"
      ]
     }
    ],
    "source": [
-    "i = 1\n",
+    "i = 4\n",
     "while i < 5:\n",
-    "    print('i is: {}'.format(i))\n",
-    "    print(\"i is: \"+str(i))\n",
-    "    i = i+1"
+    "    print('i is: --- {} '.format(i))\n",
+    "    i=i+1"
    ]
   },
   {
@@ -132,14 +119,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "0\n",
       "1\n",
       "2\n",
       "3\n",
@@ -148,7 +134,7 @@
     }
    ],
    "source": [
-    "for i in range(5):\n",
+    "for i in range(1,5):\n",
     "    print(i)"
    ]
   },
diff --git a/Sets.ipynb b/Sets.ipynb
index cb53a42..ee12881 100644
--- a/Sets.ipynb
+++ b/Sets.ipynb
@@ -29,48 +29,49 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "{1, 2, 3}"
+       "{1, 2, 3, 12}"
       ]
      },
-     "execution_count": 2,
+     "execution_count": 1,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "{1,2,3,1,2,1,2,3,3,3,3,2,2,2,1,1,2}"
+    "{1,2,3,1,2,1,2,3,3,3,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,12,2,2,1,1,2}"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "{'banana', 'orange', 'mango', 'cherry', 'grapes', 'apple'}\n"
+      "{'apple', 'cherry', 'banana'}\n",
+      "{'mango', 'grapes', 'banana', 'cherry', 'apple', 'orange'}\n"
      ]
     }
    ],
    "source": [
     "thisset = {\"apple\", \"banana\", \"cherry\"}\n",
-    "\n",
-    "thisset.update([\"orange\", \"mango\", \"grapes\"])\n",
+    "print(thisset)\n",
+    "thisset.update([ \"grapes\",\"orange\", \"mango\",\"banana\",\"apple\", \"banana\", \"cherry\"])\n",
     "\n",
     "print(thisset)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [
     {
@@ -82,7 +83,7 @@
     }
    ],
    "source": [
-    "p=(1,2,3,1,2,1,2,3,3,3,3,2,2,2,1,1,1)\n",
+    "p=[1,2,3,1,2,1,2,3,3,3,3,2,2,2,1,1,1]\n",
     "s=set(p)\n",
     "print(s)"
    ]
diff --git a/String.ipynb b/String.ipynb
index 51689fc..e42a7e6 100644
--- a/String.ipynb
+++ b/String.ipynb
@@ -2,18 +2,16 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 3,
    "metadata": {},
    "outputs": [
     {
-     "data": {
-      "text/plain": [
-       "'single quotes'"
-      ]
-     },
-     "execution_count": 2,
-     "metadata": {},
-     "output_type": "execute_result"
+     "ename": "SyntaxError",
+     "evalue": "EOF while scanning triple-quoted string literal (<ipython-input-3-377b842804df>, line 1)",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-3-377b842804df>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    'single qu''''otes'\u001b[0m\n\u001b[1;37m                       ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m EOF while scanning triple-quoted string literal\n"
+     ]
     }
    ],
    "source": [
@@ -22,27 +20,32 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
-   "metadata": {},
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": true,
+    "jupyter": {
+     "outputs_hidden": true
+    }
+   },
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "'double quotes'"
+       "\"double quo''''''''tes\""
       ]
      },
-     "execution_count": 3,
+     "execution_count": 4,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "\"double quotes\""
+    "\"double quo''''''''tes\""
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
@@ -51,7 +54,7 @@
        "\" wrap lot's of other quotes\""
       ]
      },
-     "execution_count": 4,
+     "execution_count": 5,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -62,220 +65,250 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 14,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "H\n"
+      "!dlroW ,olleH\n"
      ]
     }
    ],
    "source": [
     "a = \"Hello, World!\"\n",
-    "print(a[0])"
+    "print(a[::-1])"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 15,
    "metadata": {},
    "outputs": [
     {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "umyadip\n"
+     "ename": "SyntaxError",
+     "evalue": "invalid syntax (<ipython-input-15-b4dcd503e6f6>, line 2)",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-15-b4dcd503e6f6>\"\u001b[1;36m, line \u001b[1;32m2\u001b[0m\n\u001b[1;33m    for i in range(len(str)+1:: -1):\u001b[0m\n\u001b[1;37m                             ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
      ]
     }
    ],
    "source": [
-    "b =\"Soumyadip\"\n",
-    "print(b[2:])"
+    "str =\"P y t h o n J A V A  C++\"\n",
+    "l=\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [
     {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "54321\n"
-     ]
+     "data": {
+      "text/plain": [
+       "'uDivyanshu'"
+      ]
+     },
+     "execution_count": 11,
+     "metadata": {},
+     "output_type": "execute_result"
     }
    ],
    "source": [
-    "b = \"6543210\"\n",
-    "print(b[-6:-1])"
+    "a=\"Divyanshu\"\n",
+    "a=a[8]+a[0:]\n",
+    "a"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 25,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "6"
+      ]
+     },
+     "execution_count": 25,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "a = \"Dutipr\"\n",
+    "len(a)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 28,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "13\n"
+      "Krishna\n"
      ]
     }
    ],
    "source": [
-    "a = \"Hello, World!\"\n",
-    "print(len(a))"
+    "b = \"Krishna\"\n",
+    "print(b[-7:100])"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 32,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Hello, World!\n"
+      "Hello,                   World!\n"
      ]
     }
    ],
    "source": [
-    "a = \"                Hello, World!               \"\n",
+    "a = \"        Hello,                   World!                  \"\n",
     "print(a.strip()) #Remove Space"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 37,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "hello, world!\n",
-      "Hello, World!\n",
+      "HELLO, World!\n",
+      "HELLO, WORLD!\n",
+      "HELLO, World!\n",
       "hello, world!\n"
      ]
     }
    ],
    "source": [
-    "a = \"Hello, World!\"\n",
-    "print(a.lower())\n",
+    "a = \"HELLO, World!\"\n",
+    "print(a)\n",
+    "print(a.upper())\n",
     "print(a)\n",
     "a=a.lower()\n",
-    "print(a)"
+    "print(a)\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Jello, World!\n",
-      "Hello, World!\n"
+      "HeDhritimano, World!\n",
+      "Hello, World!\n",
+      "Jello, World!\n"
      ]
     }
    ],
    "source": [
     "a = \"Hello, World!\"\n",
-    "print(a.replace(\"H\", \"J\"))\n",
+    "print(a.replace(\"ll\", \"Dhritiman\"))\n",
+    "print(a)\n",
+    "a=a.replace(\"H\", \"J\")\n",
     "print(a)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
+   "execution_count": 59,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "['Hello', ' World!']\n",
-      "['Hello', ' World!']\n"
+      "['', 'C']\n"
      ]
     }
    ],
    "source": [
-    "a = \"Hello, World!\"\n",
-    "print(a.split(\",\"))\n",
-    "l=a.split(\",\")\n",
-    "print(l)"
+    "a = \"ABC\"\n",
+    "print(a.split(\"AB\"))"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": 61,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "True\n"
+      "False\n"
      ]
     }
    ],
    "source": [
     "txt = \"The rain in Spain stays mainly in the plain\"\n",
-    "x = \"ain\" in txt\n",
+    "x = \"Speutrwyhejwjq3w4jhjain\" in txt\n",
     "print(x)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": 71,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "10 Python \n"
+      "Python  10\n"
      ]
     }
    ],
    "source": [
     "a=10\n",
     "b=\"Python\"\n",
-    "c=\"{} {} \"\n",
-    "print(c.format(a,b))"
+    "c=\"{}  {}\"\n",
+    "print(c.format(b,a,a,a,a,a,a,a))\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 15,
+   "execution_count": 96,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Python 10 \n"
+      " 333 443  233 133 \n"
      ]
     }
    ],
    "source": [
-    "a=10\n",
-    "b=\"Python\"\n",
-    "c=\"{1} {0} \"\n",
-    "print(c.format(a,b))"
+    "a=133\n",
+    "b=\"233\"\n",
+    "d=\"333\"\n",
+    "e=\"443\"\n",
+    "c=\" {1} {0}  {3} {2} \"\n",
+    "print(c.format(a,b,e,d))\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": 58,
    "metadata": {},
    "outputs": [
     {
@@ -287,7 +320,7 @@
     }
    ],
    "source": [
-    "a=10\n",
+    "\n",
     "b=\"Python\"\n",
     "c=\"{p} {q} \"\n",
     "print(c.format(p=a,q=b))"
@@ -295,16 +328,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 23,
+   "execution_count": 74,
    "metadata": {},
    "outputs": [],
    "source": [
-    "st = 'hello #  my name is  # Soumyadip'"
+    "yt = 'hello #  my name is  # Soumyadip'"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 24,
+   "execution_count": 70,
    "metadata": {},
    "outputs": [
     {
@@ -313,13 +346,13 @@
        "['hello ', '  my name is  ', ' Soumyadip']"
       ]
      },
-     "execution_count": 24,
+     "execution_count": 70,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "st.split('#')"
+    "    tr.split('#')"
    ]
   },
   {
@@ -339,12 +372,12 @@
     }
    ],
    "source": [
-    "st.split('#')[1]"
+    "tr.split('#')[1]"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 27,
+   "execution_count": 73,
    "metadata": {},
    "outputs": [
     {
@@ -353,13 +386,13 @@
        "True"
       ]
      },
-     "execution_count": 27,
+     "execution_count": 73,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "'Soumyadip' in st"
+    "'Soumyadip' in yt"
    ]
   }
  ],
diff --git a/Tuples.ipynb b/Tuples.ipynb
index 65d8623..c78bf58 100644
--- a/Tuples.ipynb
+++ b/Tuples.ipynb
@@ -79,7 +79,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [
     {
@@ -96,7 +96,7 @@
    "source": [
     "thistuple = (\"apple\", \"banana\", \"cherry\")\n",
     "print(thistuple[-1])\n",
-    "print(thistuple[-0])\n",
+    "print(thistuple[0])\n",
     "print(thistuple[-2])\n",
     "print(thistuple[-3])"
    ]
@@ -107,63 +107,64 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "thistuple = (\"apple\", \"banana\", \"cherry\")"
+    "tgyfdfxrdectrs = (\"apple\", \"banana\", \"cherry\")"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "('cherry', 'orange', 'kiwi')\n"
+      "('banana', 'cherry', 'orange', 'kiwi', 'melon')\n"
      ]
     }
    ],
    "source": [
     "thistuple = (\"apple\", \"banana\", \"cherry\", \"orange\", \"kiwi\", \"melon\", \"mango\")\n",
-    "print(thistuple[2:5])"
+    "print(thistuple[1:6])"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "('cherry', 'orange', 'kiwi')\n"
+      "()\n"
      ]
     }
    ],
    "source": [
     "thistuple = (\"apple\", \"banana\", \"cherry\", \"orange\", \"kiwi\", \"melon\", \"mango\")\n",
-    "print(thistuple[2:5])"
+    "print(thistuple[:-7])"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "['apple', 'kiwi', 'cherry']\n",
-      "('apple', 'kiwi', 'cherry')\n"
+      "['apple', 'kiwi', 'banana', 'cherry']\n",
+      "('apple', 'kiwi', 'banana', 'cherry')\n"
      ]
     }
    ],
    "source": [
     "x = (\"apple\", \"banana\", \"cherry\")\n",
     "y = list(x)\n",
-    "y[1] = \"kiwi\"\n",
+    "\n",
+    "y.insert(1,\"kiwi\")\n",
     "x = tuple(y)\n",
     "\n",
     "print(y)\n",
@@ -212,12 +213,25 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 16,
+   "execution_count": 3,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "ename": "NameError",
+     "evalue": "name 'thistuple' is not defined",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[1;31mNameError\u001b[0m                                 Traceback (most recent call last)",
+      "\u001b[1;32m<ipython-input-3-7255dda8a7d6>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[0mthistuple\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m(\u001b[0m\u001b[1;34m\"apple\"\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m\"banana\"\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m\"cherry\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[1;32mdel\u001b[0m \u001b[0mthistuple\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mthistuple\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
+      "\u001b[1;31mNameError\u001b[0m: name 'thistuple' is not defined"
+     ]
+    }
+   ],
    "source": [
     "thistuple = (\"apple\", \"banana\", \"cherry\")\n",
-    "del thistuple"
+    "del thistuple\n",
+    "print(thistuple)"
    ]
   },
   {
diff --git a/Untitled1.ipynb b/Untitled1.ipynb
new file mode 100644
index 0000000..11e9b45
--- /dev/null
+++ b/Untitled1.ipynb
@@ -0,0 +1,395 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Hello world\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(\"Hello world\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "2"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "1+1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "4"
+      ]
+     },
+     "execution_count": 9,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "1*4"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "4.0"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "8/2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "4"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "8//2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "1"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "9%2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "4194304"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "2**22"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "45"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "(2+3)*(9+0)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "True"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "True"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "False"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "False"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "False"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "1>2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "True"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "1<2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "True"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "1==1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "10"
+      ]
+     },
+     "execution_count": 27,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "i=10\n",
+    "i"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 33,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "-1000"
+      ]
+     },
+     "execution_count": 33,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "a=-1000\n",
+    "a"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 35,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "z=10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 36,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "10"
+      ]
+     },
+     "execution_count": 36,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "z"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "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": "3.7.4"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}
diff --git a/Untitled2.ipynb b/Untitled2.ipynb
new file mode 100644
index 0000000..9be32df
--- /dev/null
+++ b/Untitled2.ipynb
@@ -0,0 +1,183 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "10"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "i=10\n",
+    "i"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "a=10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0\n",
+      "<class 'int'>\n"
+     ]
+    }
+   ],
+   "source": [
+    "a=-10\n",
+    "b=10.1\n",
+    "c=int(a+b)                  #Typecasting\n",
+    "print(c)\n",
+    "print(type(c))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 46,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'aaaaa'"
+      ]
+     },
+     "execution_count": 46,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "str=\"aaaaa\"\n",
+    "str"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 41,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Hi\n"
+     ]
+    }
+   ],
+   "source": [
+    "if 1>2 :\n",
+    "    print(\"Hello\")\n",
+    "elif 1==1:\n",
+    "    print(\"Hi\")\n",
+    "else:\n",
+    "    print(\"World\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "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": "3.7.4"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}
diff --git a/Untitled3.ipynb b/Untitled3.ipynb
new file mode 100644
index 0000000..d2e759c
--- /dev/null
+++ b/Untitled3.ipynb
@@ -0,0 +1,248 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Hello World\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(\"Hello World\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "2"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "1+1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(1-1)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "4.5"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "9/2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "4"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "9//2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "1"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "9%2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "8"
+      ]
+     },
+     "execution_count": 11,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "2**3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "True"
+      ]
+     },
+     "execution_count": 12,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "True"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "False"
+      ]
+     },
+     "execution_count": 13,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "False"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "True"
+      ]
+     },
+     "execution_count": 15,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "1<2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "20\n",
+      "<class 'int'>\n"
+     ]
+    }
+   ],
+   "source": [
+    "a=10\n",
+    "b=10.1\n",
+    "c=int(a+b)\n",
+    "print(c)\n",
+    "print(type(c))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "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": "3.7.4"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}
diff --git a/Untitled4.ipynb b/Untitled4.ipynb
new file mode 100644
index 0000000..f98dc2b
--- /dev/null
+++ b/Untitled4.ipynb
@@ -0,0 +1,138 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "10\n"
+     ]
+    }
+   ],
+   "source": [
+    "a=10\n",
+    "a\n",
+    "print(a)\n",
+    "a\n",
+    "b=9"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "<class 'int'>\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(type(a))\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 20,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "<class 'str'>\n"
+     ]
+    },
+    {
+     "data": {
+      "text/plain": [
+       "'Hello World'"
+      ]
+     },
+     "execution_count": 20,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "s=\"Hello World\"\n",
+    "s\n",
+    "print(type(s))\n",
+    "s"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 46,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Hi\n"
+     ]
+    }
+   ],
+   "source": [
+    "if 1>2 : \n",
+    "    print(\"Hello\") \n",
+    "    print(\"Hello\")\n",
+    "    print(\"Hello\") \n",
+    "elif 1==1 :\n",
+    "    print(\"Hi\")\n",
+    "else : \n",
+    "    print(\"World\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "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": "3.7.4"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}