Lambda function.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "e9232a80",
   "metadata": {},
   "source": [
    "It is an anonymous function defined without a name and without using a def keyword. It can take only one expression but have multiple arguments."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "08886e64",
   "metadata": {},
   "outputs": [],
   "source": [
    "def add(a,b):\n",
    "    result=a+b\n",
    "    return result"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "3251842a",
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       "10"
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     "execution_count": 20,
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   "source": [
    "add(3,7)"
   ]
  },
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       "10"
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     "execution_count": 21,
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   "source": [
    "add = lambda a,b : a+b ## Syntax lambda arguments: expression\n",
    "add(3,7)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "id": "d32e1b18",
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       "82"
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     "execution_count": 22,
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   "source": [
    "add = lambda a:a+50\n",
    "add(32)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "id": "8ef2e754",
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     "data": {
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       "15"
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     "execution_count": 23,
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   "source": [
    " (lambda a,b:a*b)(5,3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "id": "d5efba62",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "14\n"
     ]
    }
   ],
   "source": [
    "###Allow as many args as you want\n",
    "addition =lambda *args : sum(args)\n",
    "print(addition(2,3,4,5))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "id": "36b90aac",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "420"
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     "execution_count": 25,
     "metadata": {},
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   ],
   "source": [
    "## return one or more function\n",
    "higher_ord_fun= lambda x, fun: x+ fun(x)\n",
    "higher_ord_fun(20, lambda x:x*x)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "id": "46a2a81e",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'odd'"
      ]
     },
     "execution_count": 26,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "(lambda x: (x % 2 and 'odd' or 'even') )(45)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "id": "b222fe53",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n"
     ]
    }
   ],
   "source": [
    "cv= lambda string: string in \"Welcome to python lambda functions Tutorial\"\n",
    "print(cv('python'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "id": "5377ea4f",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n"
     ]
    }
   ],
   "source": [
    "cv= lambda string: string in \"Welcome to python lambda functions Tutorial\"\n",
    "print(cv('python'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "id": "b505b53d",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "'list' object is not callable",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "Cell \u001b[1;32mIn[35], line 2\u001b[0m\n\u001b[0;32m      1\u001b[0m num \u001b[38;5;241m=\u001b[39m [\u001b[38;5;241m19\u001b[39m, \u001b[38;5;241m34\u001b[39m, \u001b[38;5;241m45\u001b[39m, \u001b[38;5;241m23\u001b[39m, \u001b[38;5;241m12\u001b[39m, \u001b[38;5;241m33\u001b[39m]\n\u001b[1;32m----> 2\u001b[0m greater \u001b[38;5;241m=\u001b[39m \u001b[38;5;28;43mlist\u001b[39;49m\u001b[43m(\u001b[49m\u001b[38;5;28;43mfilter\u001b[39;49m\u001b[43m(\u001b[49m\u001b[38;5;28;43;01mlambda\u001b[39;49;00m\u001b[43m \u001b[49m\u001b[43mnum\u001b[49m\u001b[43m:\u001b[49m\u001b[43m \u001b[49m\u001b[43mnum\u001b[49m\u001b[38;5;241;43m>\u001b[39;49m\u001b[38;5;241;43m30\u001b[39;49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43mnum\u001b[49m\u001b[43m)\u001b[49m\u001b[43m)\u001b[49m\n\u001b[0;32m      3\u001b[0m \u001b[38;5;28mprint\u001b[39m(greater)\n",
      "\u001b[1;31mTypeError\u001b[0m: 'list' object is not callable"
     ]
    }
   ],
   "source": [
    "num = [19, 34, 45, 23, 12, 33]\n",
    "greater = list(filter(lambda num: num>30, num))\n",
    "print(greater)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "id": "554da57e",
   "metadata": {
    "scrolled": false
   },
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "'list' object is not callable",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "Cell \u001b[1;32mIn[39], line 3\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[38;5;66;03m## Map function along with the lambda function\u001b[39;00m\n\u001b[0;32m      2\u001b[0m list1 \u001b[38;5;241m=\u001b[39m [\u001b[38;5;241m2\u001b[39m,\u001b[38;5;241m5\u001b[39m,\u001b[38;5;241m10\u001b[39m,\u001b[38;5;241m6\u001b[39m,\u001b[38;5;241m4\u001b[39m,\u001b[38;5;241m12\u001b[39m]\n\u001b[1;32m----> 3\u001b[0m double_the_num \u001b[38;5;241m=\u001b[39m \u001b[38;5;28;43mlist\u001b[39;49m\u001b[43m(\u001b[49m\u001b[38;5;28;43mmap\u001b[39;49m\u001b[43m(\u001b[49m\u001b[38;5;28;43;01mlambda\u001b[39;49;00m\u001b[43m \u001b[49m\u001b[43mx\u001b[49m\u001b[43m:\u001b[49m\u001b[43m \u001b[49m\u001b[43mx\u001b[49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[38;5;241;43m2\u001b[39;49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43mlist1\u001b[49m\u001b[43m)\u001b[49m\u001b[43m)\u001b[49m\n\u001b[0;32m      4\u001b[0m \u001b[38;5;28mprint\u001b[39m(double_the_num)\n",
      "\u001b[1;31mTypeError\u001b[0m: 'list' object is not callable"
     ]
    }
   ],
   "source": [
    "## Map function along with the lambda function\n",
    "list1 = [2,5,10,6,4,12]\n",
    "double_the_num = list(map(lambda x: x*2, list1))\n",
    "print(double_the_num)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "602125e2",
   "metadata": {},
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "id": "a5d81834",
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "'list' object is not callable",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "Cell \u001b[1;32mIn[40], line 3\u001b[0m\n\u001b[0;32m      1\u001b[0m list3 \u001b[38;5;241m=\u001b[39m  [\u001b[38;5;241m2\u001b[39m,\u001b[38;5;241m5\u001b[39m,\u001b[38;5;241m10\u001b[39m,\u001b[38;5;241m6\u001b[39m,\u001b[38;5;241m4\u001b[39m,\u001b[38;5;241m12\u001b[39m]\n\u001b[0;32m      2\u001b[0m cube \u001b[38;5;241m=\u001b[39m \u001b[38;5;28mmap\u001b[39m(\u001b[38;5;28;01mlambda\u001b[39;00m x: \u001b[38;5;28mpow\u001b[39m(x,\u001b[38;5;241m3\u001b[39m), list3)\n\u001b[1;32m----> 3\u001b[0m \u001b[38;5;28;43mlist\u001b[39;49m\u001b[43m(\u001b[49m\u001b[43mcube\u001b[49m\u001b[43m)\u001b[49m\n",
      "\u001b[1;31mTypeError\u001b[0m: 'list' object is not callable"
     ]
    }
   ],
   "source": [
    "list3 =  [2,5,10,6,4,12]\n",
    "cube = map(lambda x: pow(x,3), list3)\n",
    "list(cube)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "id": "165a75e0",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "39\n"
     ]
    }
   ],
   "source": [
    "from functools import reduce\n",
    "list4 = [2,5,10,6,4,12]\n",
    "sum = reduce((lambda x,y: x+y), list4)\n",
    "print(sum)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "id": "ac3ede52",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "28800\n"
     ]
    }
   ],
   "source": [
    "from functools import reduce\n",
    "list4 = [2,5,10,6,4,12]\n",
    "pro = reduce((lambda x,y: x*y), list4)\n",
    "print(pro)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "id": "f5e2b03c",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "19"
      ]
     },
     "execution_count": 45,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def quadratic(a,b,c):\n",
    "    return lambda x: a*x*2 + b*x +c \n",
    "f = quadratic(2,3,5)\n",
    "f(2) ## value of x"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "2fd8cd39",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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