{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "List ,[-- 1D Datastructure for storing Objects], Operations"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Creating Lists []   ####"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "#1a.\n",
    "list_num=[1,2,3]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 2, 3]\n"
     ]
    }
   ],
   "source": [
    "print (list_num)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "#1b.using range method\n",
    "list_range=list(range(0,5))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 1, 2, 3, 4]\n"
     ]
    }
   ],
   "source": [
    "print(list_range)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "#1c,using range method step argument\n",
    "list_range_step=list(range(0,5,2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[0, 2, 4]"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "print(list_range_step)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[0, 1, 2, 3, 4]"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "#1d.List Comprehension, creating a list from another list by applying opertaions on elements of source List\n",
    "print(list_range)  #src List"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 5, 10, 15, 20]\n"
     ]
    }
   ],
   "source": [
    "list_compre=[x*5 for x in list_range]\n",
    "print(list_compre)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 2, 3, 4, 5]\n"
     ]
    }
   ],
   "source": [
    "#1e.Using map function, maipulate each item of a source list using a defined function and create a new list\n",
    "def addOne(x):\n",
    "    return x+1;\n",
    "\n",
    "range_list_plus_one=list(map(addOne,list_range))\n",
    "print(range_list_plus_one)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 2, 4]\n"
     ]
    }
   ],
   "source": [
    "#1f.using filter function,filter out elements and create a new list from source list\n",
    "def evenMembers(x):\n",
    "    if x % 2==0:\n",
    "        return True\n",
    "    else:\n",
    "        return False\n",
    "    \n",
    "filtered_out_list=list(filter(evenMembers,list_range))\n",
    "print(filtered_out_list)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 2, 4]\n"
     ]
    }
   ],
   "source": [
    "#1g.Lambda expression , anonymous function , used for brevity , you can implement the above evenMembers function inline \n",
    "filtered_out_list_using_lambda=list(filter(lambda x:x%2==0,list_range))\n",
    "print(filtered_out_list_using_lambda)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Adding Element to List ####"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 2, 4, 9]\n"
     ]
    }
   ],
   "source": [
    "filtered_out_list_using_lambda.append(9)\n",
    "print(filtered_out_list_using_lambda)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Updating element of a list ####"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 2, 4, 90]\n"
     ]
    }
   ],
   "source": [
    "filtered_out_list_using_lambda[3]=90  #3 is the index not element value\n",
    "print(filtered_out_list_using_lambda)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Removing element from a List ####"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 2, 4]\n"
     ]
    }
   ],
   "source": [
    "filtered_out_list_using_lambda.remove(90)  # removes the first instance of 90\n",
    "print(filtered_out_list_using_lambda)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Selecting a sublist : notation ####"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 5, 10, 15, 20]\n"
     ]
    }
   ],
   "source": [
    "print(list_compre)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[10, 15]\n"
     ]
    }
   ],
   "source": [
    "subList=list_compre[2:4]  # start from 2nd index till 3rd\n",
    "print(subList)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Nested List ####"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 2, 3, 4, ['a', 'b', 'c', 'd']]\n"
     ]
    }
   ],
   "source": [
    "nested_alpha_numeric_list = [1,2,3,4,['a','b','c','d']]\n",
    "print(nested_alpha_numeric_list)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Accessing particular element in a nested List using [][] notations ####"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "b\n"
     ]
    }
   ],
   "source": [
    "print(nested_alpha_numeric_list[4][1])  ##accesses 'b' of nested list"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Iterating a List item by item ####"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0\n",
      "5\n",
      "10\n",
      "15\n",
      "20\n"
     ]
    }
   ],
   "source": [
    "for item in list_compre:\n",
    "    print(item)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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