23-09-2021.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "dde279e2",
   "metadata": {},
   "source": [
    "###### Today's Agenda\n",
    "- Strings and it's methods\n",
    "    - immutable\n",
    "- Lists and it's methods"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "f8f2830b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'langauge'"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s=\"Python is a interpreted langauge\"\n",
    "s[-8:]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "0338abf5",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'eguagn'"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s[-1:-7:-1]\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "06224792",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'eguagnal deterpretni a si nohtyP'"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# to reverse the string\n",
    "s[::-1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "fe153736",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "malayalam\n",
      "palindrome\n"
     ]
    }
   ],
   "source": [
    "# write a program to check whether the given string is palindrome or not\n",
    "n=input()\n",
    "r=n[::-1]\n",
    "if n==r:\n",
    "    print(\"palindrome\")\n",
    "else:\n",
    "    print(\"not a palindrome\") "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "9f629a68",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Python is a interpreted langauge'"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s[:]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "1fdd00c9",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Python is a interpreted langauge'"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s[::]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "bab7fdf7",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Pto saitrrtdlnag'"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s[::2]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "8cb8312b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['__add__',\n",
       " '__class__',\n",
       " '__contains__',\n",
       " '__delattr__',\n",
       " '__dir__',\n",
       " '__doc__',\n",
       " '__eq__',\n",
       " '__format__',\n",
       " '__ge__',\n",
       " '__getattribute__',\n",
       " '__getitem__',\n",
       " '__getnewargs__',\n",
       " '__gt__',\n",
       " '__hash__',\n",
       " '__init__',\n",
       " '__init_subclass__',\n",
       " '__iter__',\n",
       " '__le__',\n",
       " '__len__',\n",
       " '__lt__',\n",
       " '__mod__',\n",
       " '__mul__',\n",
       " '__ne__',\n",
       " '__new__',\n",
       " '__reduce__',\n",
       " '__reduce_ex__',\n",
       " '__repr__',\n",
       " '__rmod__',\n",
       " '__rmul__',\n",
       " '__setattr__',\n",
       " '__sizeof__',\n",
       " '__str__',\n",
       " '__subclasshook__',\n",
       " 'capitalize',\n",
       " 'casefold',\n",
       " 'center',\n",
       " 'count',\n",
       " 'encode',\n",
       " 'endswith',\n",
       " 'expandtabs',\n",
       " 'find',\n",
       " 'format',\n",
       " 'format_map',\n",
       " 'index',\n",
       " 'isalnum',\n",
       " 'isalpha',\n",
       " 'isascii',\n",
       " 'isdecimal',\n",
       " 'isdigit',\n",
       " 'isidentifier',\n",
       " 'islower',\n",
       " 'isnumeric',\n",
       " 'isprintable',\n",
       " 'isspace',\n",
       " 'istitle',\n",
       " 'isupper',\n",
       " 'join',\n",
       " 'ljust',\n",
       " 'lower',\n",
       " 'lstrip',\n",
       " 'maketrans',\n",
       " 'partition',\n",
       " 'replace',\n",
       " 'rfind',\n",
       " 'rindex',\n",
       " 'rjust',\n",
       " 'rpartition',\n",
       " 'rsplit',\n",
       " 'rstrip',\n",
       " 'split',\n",
       " 'splitlines',\n",
       " 'startswith',\n",
       " 'strip',\n",
       " 'swapcase',\n",
       " 'title',\n",
       " 'translate',\n",
       " 'upper',\n",
       " 'zfill']"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dir(str)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "29b50cac",
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on method_descriptor:\n",
      "\n",
      "count(...)\n",
      "    S.count(sub[, start[, end]]) -> int\n",
      "    \n",
      "    Return the number of non-overlapping occurrences of substring sub in\n",
      "    string S[start:end].  Optional arguments start and end are\n",
      "    interpreted as in slice notation.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(str.count)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "963b9c69",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Python is a interpreted langauge'"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "47c41620",
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function upper:\n",
      "\n",
      "upper() method of builtins.str instance\n",
      "    Return a copy of the string converted to uppercase.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(s.upper)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "48fdf365",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'PYTHON IS A INTERPRETED LANGAUGE'"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.upper()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "5b0b58c0",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'python is a interpreted langauge'"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.lower()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "739fbe87",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "False"
      ]
     },
     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s=\"DataScience\"\n",
    "len(s)\n",
    "s[0].islower()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "31536abc",
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "D\n",
      "a\n",
      "t\n",
      "a\n",
      "S\n",
      "c\n",
      "i\n",
      "e\n",
      "n\n",
      "c\n",
      "e\n"
     ]
    }
   ],
   "source": [
    "for i in range(len(s)):\n",
    "    print(s[i])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "24824e44",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "D a t a S c i e n c e "
     ]
    }
   ],
   "source": [
    "for i in s:\n",
    "    print(i,end=\" \")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "id": "1f94c456",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Vinod Kumar\n",
      "8 2\n",
      "Kiladi Supriya\n",
      "11 2\n",
      "kdjkasljFFFFJJ\n",
      "8 6\n"
     ]
    }
   ],
   "source": [
    "for i in range(3):\n",
    "    s=input()\n",
    "    lc=0\n",
    "    uc=0\n",
    "    for i in s:\n",
    "        if i.islower():\n",
    "            lc+=1\n",
    "        elif i.isupper():\n",
    "            uc+=1\n",
    "    print(lc,uc)        "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "id": "4e6dd271",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'kdjkasljFFFFJJ'"
      ]
     },
     "execution_count": 23,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "id": "f2aa5701",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "4"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.count(\"F\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "id": "963f5f8b",
   "metadata": {},
   "outputs": [],
   "source": [
    "s=\"jsbjsbjsbbbbbbsssbbbbb\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "id": "38f26644",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "13"
      ]
     },
     "execution_count": 26,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.count(\"b\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "id": "597deb87",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "4"
      ]
     },
     "execution_count": 27,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.count(\"b\",1,10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "id": "838c3ac2",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "5"
      ]
     },
     "execution_count": 28,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s=\"apssdc\"\n",
    "s.index(\"c\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "id": "ad89f744",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "0"
      ]
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.find('a')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "id": "ca34d94a",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'{{{{{{{{{{{{{[[[[[[[         hdjdsknd.ndmd,m.d/m,dm                     ]]]]]]]}}}}}}}}}}}}}'"
      ]
     },
     "execution_count": 30,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s=\"{{{{{{{{{{{{{[[[[[[[         hdjdsknd.ndmd,m.d/m,dm                     ]]]]]]]}}}}}}}}}}}}}\"\n",
    "s.strip()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "id": "0033d0a1",
   "metadata": {},
   "outputs": [],
   "source": [
    "s=\"              jhjh                       \""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "id": "a2998656",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'jhjh'"
      ]
     },
     "execution_count": 33,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.strip()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "id": "a58b6e45",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'jhjffh'"
      ]
     },
     "execution_count": 34,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s=\"      jhjffh\"\n",
    "s.lstrip()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "id": "9f05ecd5",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "False"
      ]
     },
     "execution_count": 35,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s=\"1234FGH\"\n",
    "#isalpha,isdecimal\n",
    "s[0].isalpha()\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "id": "4afe2ced",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 36,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s[0].isdecimal()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "id": "accde26f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'1234FGH'"
      ]
     },
     "execution_count": 37,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "id": "3da2c4c5",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "True"
      ]
     },
     "execution_count": 39,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.endswith(\"H\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "id": "b4fafe6b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'1234FGH'"
      ]
     },
     "execution_count": 40,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "id": "6329fdc8",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'A234FGH'"
      ]
     },
     "execution_count": 42,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.replace(\"1\",\"A\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "id": "1cdb3e9d",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'AAAAfnfnknv'"
      ]
     },
     "execution_count": 43,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s=\"1111fnfnknv\"\n",
    "s.replace(\"1\",\"A\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "id": "4d636508",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'AA11fnfnknv'"
      ]
     },
     "execution_count": 45,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s.replace(\"1\",\"A\",2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 47,
   "id": "c7f97cfe",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1 2 3 4 5 6 7 8 9\n"
     ]
    }
   ],
   "source": [
    "#split\n",
    "#1 2 3 4 5 6 7 8 9 \n",
    "a=input()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 48,
   "id": "41f0a93d",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "str"
      ]
     },
     "execution_count": 48,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "type(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 49,
   "id": "c49a2fc2",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['1', '2', '3', '4', '5', '6', '7', '8', '9']"
      ]
     },
     "execution_count": 49,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a.split()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 50,
   "id": "9a71a4d6",
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on method_descriptor:\n",
      "\n",
      "split(self, /, sep=None, maxsplit=-1)\n",
      "    Return a list of the words in the string, using sep as the delimiter string.\n",
      "    \n",
      "    sep\n",
      "      The delimiter according which to split the string.\n",
      "      None (the default value) means split according to any whitespace,\n",
      "      and discard empty strings from the result.\n",
      "    maxsplit\n",
      "      Maximum number of splits to do.\n",
      "      -1 (the default value) means no limit.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(str.split)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "id": "cdbf1287",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "apssdc,training\n"
     ]
    }
   ],
   "source": [
    "b=input()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 55,
   "id": "7b21e11f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'apssdc,training'"
      ]
     },
     "execution_count": 55,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 56,
   "id": "bcb5a045",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apssdc,training']"
      ]
     },
     "execution_count": 56,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b.split()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 57,
   "id": "79e8330e",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apssdc', 'training']"
      ]
     },
     "execution_count": 57,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "b.split(\",\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 58,
   "id": "ae7dfb4f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'1 2 3 4 5 6 7 8 9'"
      ]
     },
     "execution_count": 58,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 60,
   "id": "36aa4e87",
   "metadata": {},
   "outputs": [],
   "source": [
    "a=a.split()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 61,
   "id": "a4fc5b50",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['1', '2', '3', '4', '5', '6', '7', '8', '9']"
      ]
     },
     "execution_count": 61,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 62,
   "id": "c6691c3b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'1,2,3,4,5,6,7,8,9'"
      ]
     },
     "execution_count": 62,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "\",\".join(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 63,
   "id": "a7416ec2",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'1@2@3@4@5@6@7@8@9'"
      ]
     },
     "execution_count": 63,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "\"@\".join(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b49220d9",
   "metadata": {},
   "outputs": [],
   "source": [
    "# write a program to find the sum of the digits in a string"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 64,
   "id": "147afc8a",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'j'"
      ]
     },
     "execution_count": 64,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a=\"jkjj\"\n",
    "a[0]\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 65,
   "id": "722976de",
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "'str' object does not support item assignment",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-65-9031244f8795>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0ma\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;34m'h'\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m: 'str' object does not support item assignment"
     ]
    }
   ],
   "source": [
    "a[0]='h'"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "bcc9647a",
   "metadata": {},
   "source": [
    "#### Lists\n",
    "- ordered collection of items \n",
    "- lists are mutable\n",
    "- accepts heterogeneous data"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 67,
   "id": "2df8662d",
   "metadata": {},
   "outputs": [],
   "source": [
    "l=[]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 68,
   "id": "924035b5",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "list"
      ]
     },
     "execution_count": 68,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "type(l)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 69,
   "id": "90d9316b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['s', 't', 'r', 'i', 'n', 'g']"
      ]
     },
     "execution_count": 69,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "s=\"string\"\n",
    "list(s)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 70,
   "id": "3336c72f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[]"
      ]
     },
     "execution_count": 70,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 71,
   "id": "ce9be2d1",
   "metadata": {},
   "outputs": [],
   "source": [
    "l=[1,2,3,\"maths\",1+2j,True,67.8]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 72,
   "id": "17366a92",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 'maths', (1+2j), True, 67.8]"
      ]
     },
     "execution_count": 72,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 73,
   "id": "1a8141bb",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1"
      ]
     },
     "execution_count": 73,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l[0]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 74,
   "id": "26d3c506",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "67.8"
      ]
     },
     "execution_count": 74,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l[-1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 75,
   "id": "1f6266dd",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3]"
      ]
     },
     "execution_count": 75,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l[:3]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 76,
   "id": "5b06c86f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 'maths', (1+2j), True]"
      ]
     },
     "execution_count": 76,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l[:-1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 77,
   "id": "5924956e",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[67.8, True, (1+2j), 'maths', 3, 2, 1]"
      ]
     },
     "execution_count": 77,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l[::-1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 78,
   "id": "55b4d484",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 'maths', (1+2j), True, 67.8]"
      ]
     },
     "execution_count": 78,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 79,
   "id": "1530ad8d",
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "3\n",
      "maths\n",
      "(1+2j)\n",
      "True\n",
      "67.8\n"
     ]
    }
   ],
   "source": [
    "for i in range(len(l)):\n",
    "    print(l[i])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 80,
   "id": "e18e1bfd",
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "3\n",
      "maths\n",
      "(1+2j)\n",
      "True\n",
      "67.8\n"
     ]
    }
   ],
   "source": [
    "for i in l:\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 81,
   "id": "d3a7b05f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['__add__',\n",
       " '__class__',\n",
       " '__contains__',\n",
       " '__delattr__',\n",
       " '__delitem__',\n",
       " '__dir__',\n",
       " '__doc__',\n",
       " '__eq__',\n",
       " '__format__',\n",
       " '__ge__',\n",
       " '__getattribute__',\n",
       " '__getitem__',\n",
       " '__gt__',\n",
       " '__hash__',\n",
       " '__iadd__',\n",
       " '__imul__',\n",
       " '__init__',\n",
       " '__init_subclass__',\n",
       " '__iter__',\n",
       " '__le__',\n",
       " '__len__',\n",
       " '__lt__',\n",
       " '__mul__',\n",
       " '__ne__',\n",
       " '__new__',\n",
       " '__reduce__',\n",
       " '__reduce_ex__',\n",
       " '__repr__',\n",
       " '__reversed__',\n",
       " '__rmul__',\n",
       " '__setattr__',\n",
       " '__setitem__',\n",
       " '__sizeof__',\n",
       " '__str__',\n",
       " '__subclasshook__',\n",
       " 'append',\n",
       " 'clear',\n",
       " 'copy',\n",
       " 'count',\n",
       " 'extend',\n",
       " 'index',\n",
       " 'insert',\n",
       " 'pop',\n",
       " 'remove',\n",
       " 'reverse',\n",
       " 'sort']"
      ]
     },
     "execution_count": 81,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dir(list)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 82,
   "id": "6b20aaa5",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 'maths', (1+2j), True, 67.8]"
      ]
     },
     "execution_count": 82,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 83,
   "id": "a1bbaf70",
   "metadata": {},
   "outputs": [],
   "source": [
    "l.append(\"23\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 84,
   "id": "86ddc1be",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 'maths', (1+2j), True, 67.8, '23']"
      ]
     },
     "execution_count": 84,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 85,
   "id": "8105d180",
   "metadata": {},
   "outputs": [],
   "source": [
    "l.append([1,2,3])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 86,
   "id": "0b77f154",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 'maths', (1+2j), True, 67.8, '23', [1, 2, 3]]"
      ]
     },
     "execution_count": 86,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 88,
   "id": "f7d9b5c7",
   "metadata": {},
   "outputs": [],
   "source": [
    "l.extend([40,50,60])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 89,
   "id": "9f43843e",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 3, 'maths', (1+2j), True, 67.8, '23', [1, 2, 3], 40, 50, 60]"
      ]
     },
     "execution_count": 89,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 91,
   "id": "7a187252",
   "metadata": {},
   "outputs": [],
   "source": [
    "l.extend([1,2,2])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 92,
   "id": "6ccee1c3",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 92,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l.count(1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 93,
   "id": "b804d313",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "4"
      ]
     },
     "execution_count": 93,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l.index(1+2j)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 94,
   "id": "9122d0a0",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "15"
      ]
     },
     "execution_count": 94,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "len(l)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 95,
   "id": "7ca77e4b",
   "metadata": {},
   "outputs": [],
   "source": [
    "l.insert(2,\"new\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 97,
   "id": "c71d0dda",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "2"
      ]
     },
     "execution_count": 97,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l.pop()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 98,
   "id": "dc5fa857",
   "metadata": {
    "collapsed": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1,\n",
       " 2,\n",
       " 'new',\n",
       " 3,\n",
       " 'maths',\n",
       " (1+2j),\n",
       " True,\n",
       " 67.8,\n",
       " '23',\n",
       " [1, 2, 3],\n",
       " 40,\n",
       " 50,\n",
       " 60,\n",
       " 1,\n",
       " 2]"
      ]
     },
     "execution_count": 98,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 99,
   "id": "2ccfc33f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "2"
      ]
     },
     "execution_count": 99,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l.pop()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 100,
   "id": "36b1f83b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1"
      ]
     },
     "execution_count": 100,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l.pop()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 101,
   "id": "6cf3af78",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 101,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l.pop(3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 103,
   "id": "bce30bda",
   "metadata": {},
   "outputs": [],
   "source": [
    "l.remove(\"new\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 104,
   "id": "aed7868d",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 'maths', (1+2j), True, 67.8, '23', [1, 2, 3], 40, 50, 60]"
      ]
     },
     "execution_count": 104,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 106,
   "id": "c974224a",
   "metadata": {},
   "outputs": [],
   "source": [
    "a=l.copy()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 107,
   "id": "364e297f",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 'maths', (1+2j), True, 67.8, '23', [1, 2, 3], 40, 50, 60]"
      ]
     },
     "execution_count": 107,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 108,
   "id": "b922a198",
   "metadata": {},
   "outputs": [],
   "source": [
    "l.clear()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 109,
   "id": "fcbc29b5",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[]"
      ]
     },
     "execution_count": 109,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 110,
   "id": "1528da29",
   "metadata": {},
   "outputs": [],
   "source": [
    "del l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 111,
   "id": "b5e383d6",
   "metadata": {},
   "outputs": [
    {
     "ename": "NameError",
     "evalue": "name 'l' 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-111-cde25b5e10ad>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0ml\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mNameError\u001b[0m: name 'l' is not defined"
     ]
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 112,
   "id": "2c3beeca",
   "metadata": {},
   "outputs": [],
   "source": [
    "l=[5,6,22,34,1]\n",
    "l.sort()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 113,
   "id": "f25e8929",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 5, 6, 22, 34]"
      ]
     },
     "execution_count": 113,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 114,
   "id": "db7cc86b",
   "metadata": {},
   "outputs": [],
   "source": [
    "l.sort(reverse=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 115,
   "id": "7bd31676",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[34, 22, 6, 5, 1]"
      ]
     },
     "execution_count": 115,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 116,
   "id": "390f0a73",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[34, 22, 6, 5, 1]"
      ]
     },
     "execution_count": 116,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 117,
   "id": "670010eb",
   "metadata": {},
   "outputs": [],
   "source": [
    "l=[1,2,6,56,23]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 118,
   "id": "c8d6b974",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 6, 23, 56]"
      ]
     },
     "execution_count": 118,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "sorted(l)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 119,
   "id": "8d6df1f8",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 6, 56, 23]"
      ]
     },
     "execution_count": 119,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e688c237",
   "metadata": {},
   "source": [
    "***sort---changes your original list***    \n",
    "***sorted----no effect on original list***"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 121,
   "id": "7397e6b0",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 6, 56, 23]"
      ]
     },
     "execution_count": 121,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 122,
   "id": "8baef89e",
   "metadata": {},
   "outputs": [],
   "source": [
    "l.reverse()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 123,
   "id": "dc2939fa",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[23, 56, 6, 2, 1]"
      ]
     },
     "execution_count": 123,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 124,
   "id": "7c628c47",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 2, 6, 56, 23]"
      ]
     },
     "execution_count": 124,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l[::-1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 125,
   "id": "a1398575",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "88"
      ]
     },
     "execution_count": 125,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# find out the sum of elements in the list\n",
    "sum(l)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 126,
   "id": "97ced534",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "88\n"
     ]
    }
   ],
   "source": [
    "s=0\n",
    "for i in range(0,len(l)):\n",
    "\n",
    "    s=s+l[i]\n",
    "print(s)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 127,
   "id": "a727d30d",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[23, 56, 6, 2, 1]"
      ]
     },
     "execution_count": 127,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "99a385de",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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