{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Introduction To Lists\n",
    "- Lists are ordered, mutable collections of items.\n",
    "- They can contain items of different data types."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##### Video Outline:\n",
    "1. Introduction to Lists\n",
    "2. Creating Lists\n",
    "3. Accessing List Elements\n",
    "4. Modifying List Elements\n",
    "5. List Methods\n",
    "6. Slicing Lists\n",
    "7. Iterating Over Lists\n",
    "8. List Comprehensions\n",
    "9. Nested Lists\n",
    "10. Practical Examples and Common Errors"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "<class 'list'>\n"
     ]
    }
   ],
   "source": [
    "lst=[]\n",
    "print(type(lst))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['Krish', 'Jack', 'Jacob', 1, 2, 3, 4, 5]\n"
     ]
    }
   ],
   "source": [
    "names=[\"Krish\",\"Jack\",\"Jacob\",1,2,3,4,5]\n",
    "print(names)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 'Hello', 3.14, True]\n"
     ]
    }
   ],
   "source": [
    "mixed_list=[1,\"Hello\",3.14,True]\n",
    "print(mixed_list)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "### Accessing List Elements\n",
    "\n",
    "fruits=[\"apple\",\"banana\",\"cherry\",\"kiwi\",\"gauva\"]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "apple\n",
      "cherry\n",
      "gauva\n",
      "gauva\n"
     ]
    }
   ],
   "source": [
    "print(fruits[0])\n",
    "print(fruits[2])\n",
    "print(fruits[4])\n",
    "print(fruits[-1])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['banana', 'cherry', 'kiwi', 'gauva']\n",
      "['banana', 'cherry']\n"
     ]
    }
   ],
   "source": [
    "print(fruits[1:])\n",
    "print(fruits[1:3])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apple', 'banana', 'cherry', 'kiwi', 'gauva']"
      ]
     },
     "execution_count": 17,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "## Modifying The List elements\n",
    "fruits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['apple', 'watermelon', 'cherry', 'kiwi', 'gauva']\n"
     ]
    }
   ],
   "source": [
    "fruits[1]=\"watermelon\"\n",
    "print(fruits)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [],
   "source": [
    "fruits[1:]=\"watermelon\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apple', 'w', 'a', 't', 'e', 'r', 'm', 'e', 'l', 'o', 'n']"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [],
   "source": [
    "fruits=[\"apple\",\"banana\",\"cherry\",\"kiwi\",\"gauva\"]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['apple', 'banana', 'cherry', 'kiwi', 'gauva', 'orange']\n"
     ]
    }
   ],
   "source": [
    "## List Methods\n",
    "\n",
    "fruits.append(\"orange\") ## Add an item to the end\n",
    "print(fruits)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['apple', 'watermelon', 'banana', 'banana', 'cherry', 'kiwi', 'gauva', 'orange']\n"
     ]
    }
   ],
   "source": [
    "fruits.insert(1,\"watermelon\")\n",
    "print(fruits)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['apple', 'watermelon', 'banana', 'cherry', 'kiwi', 'gauva', 'orange']\n"
     ]
    }
   ],
   "source": [
    "fruits.remove(\"banana\") ## Removing the first occurance of an item\n",
    "print(fruits)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "orange\n",
      "['apple', 'watermelon', 'banana', 'cherry', 'kiwi', 'gauva']\n"
     ]
    }
   ],
   "source": [
    "## Remove and return the last element\n",
    "popped_fruits=fruits.pop()\n",
    "print(popped_fruits)\n",
    "print(fruits)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n"
     ]
    }
   ],
   "source": [
    "index=fruits.index(\"cherry\")\n",
    "print(index)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2\n"
     ]
    }
   ],
   "source": [
    "fruits.insert(2,\"banana\")\n",
    "print(fruits.count(\"banana\"))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apple', 'watermelon', 'banana', 'banana', 'cherry', 'kiwi', 'gauva']"
      ]
     },
     "execution_count": 31,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [],
   "source": [
    "fruits.sort() ## SSorts the list in ascending order"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['apple', 'banana', 'banana', 'cherry', 'gauva', 'kiwi', 'watermelon']"
      ]
     },
     "execution_count": 33,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "metadata": {},
   "outputs": [],
   "source": [
    "fruits.reverse() ## REverse the list"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['watermelon', 'kiwi', 'gauva', 'cherry', 'banana', 'banana', 'apple']"
      ]
     },
     "execution_count": 35,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fruits"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[]\n"
     ]
    }
   ],
   "source": [
    "fruits.clear() ## Remove all items from the list\n",
    "\n",
    "print(fruits)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[3, 4, 5]\n",
      "[1, 2, 3, 4, 5]\n",
      "[6, 7, 8, 9, 10]\n",
      "[1, 3, 5, 7, 9]\n",
      "[10, 9, 8, 7, 6, 5, 4, 3, 2, 1]\n"
     ]
    }
   ],
   "source": [
    "## Slicing List\n",
    "numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n",
    "print(numbers[2:5])\n",
    "print(numbers[:5])\n",
    "print(numbers[5:])\n",
    "print(numbers[::2])\n",
    "print(numbers[::-1])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 4, 7, 10]"
      ]
     },
     "execution_count": 41,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "numbers[::3]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[10, 8, 6, 4, 2]"
      ]
     },
     "execution_count": 42,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "numbers[::-2]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "3\n",
      "4\n",
      "5\n",
      "6\n",
      "7\n",
      "8\n",
      "9\n",
      "10\n"
     ]
    }
   ],
   "source": [
    "### Iterating Over List\n",
    "\n",
    "for number in numbers:\n",
    "    print(number)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 1\n",
      "1 2\n",
      "2 3\n",
      "3 4\n",
      "4 5\n",
      "5 6\n",
      "6 7\n",
      "7 8\n",
      "8 9\n",
      "9 10\n"
     ]
    }
   ],
   "source": [
    "## Iterating with index\n",
    "for index,number in enumerate(numbers):\n",
    "    print(index,number)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]\n"
     ]
    }
   ],
   "source": [
    "## List comprehension\n",
    "lst=[]\n",
    "for x in range(10):\n",
    "    lst.append(x**2)\n",
    "\n",
    "print(lst)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 48,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]"
      ]
     },
     "execution_count": 48,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "[x**2 for x in range(10)]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##### List Comprehension\n",
    "\n",
    "Basics Syantax            [expression for item in iterable]\n",
    "\n",
    "with conditional logic    [expression for item in iterable if condition]\n",
    "\n",
    "Nested List Comprehension [expression for item1 in iterable1 for item2 in iterable2]\n",
    "\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 49,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]\n"
     ]
    }
   ],
   "source": [
    "### Basic List Comphrension\n",
    "\n",
    "sqaure=[num**2 for num in range(10)]\n",
    "print(sqaure)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 50,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 2, 4, 6, 8]\n"
     ]
    }
   ],
   "source": [
    "### List Comprehension with Condition\n",
    "lst=[]\n",
    "for i in range(10):\n",
    "    if i%2==0:\n",
    "        lst.append(i)\n",
    "\n",
    "print(lst)\n",
    "        "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 51,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 2, 4, 6, 8]\n"
     ]
    }
   ],
   "source": [
    "even_numbers=[num for num in range(10) if num%2==0]\n",
    "print(even_numbers)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[[1, 'a'], [1, 'b'], [1, 'c'], [1, 'd'], [2, 'a'], [2, 'b'], [2, 'c'], [2, 'd'], [3, 'a'], [3, 'b'], [3, 'c'], [3, 'd'], [4, 'a'], [4, 'b'], [4, 'c'], [4, 'd']]\n"
     ]
    }
   ],
   "source": [
    "## Nested List Comphrension\n",
    "\n",
    "lst1=[1,2,3,4]\n",
    "lst2=['a','b','c','d']\n",
    "\n",
    "pair=[[i,j] for i in lst1 for j in lst2]\n",
    "\n",
    "print(pair)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[5, 5, 6, 4, 13]\n"
     ]
    }
   ],
   "source": [
    "## List Comprehension with function calls\n",
    "words = [\"hello\", \"world\", \"python\", \"list\", \"comprehension\"]\n",
    "lengths = [len(word) for word in words]\n",
    "print(lengths)  # Output: [5, 5, 6, 4, 13]\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Conclusion\n",
    "List comprehensions are a powerful and concise way to create lists in Python. They are syntactically compact and can replace more verbose looping constructs. Understanding the syntax of list comprehensions will help you write cleaner and more efficient Python code."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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