#43 Python Tutorial for Beginners | Filter Map Reduce

[@NitinJainNoida]

Know what is the difference between filter, reduce and map: map: Takes a function f, and a list L1, and returns a list L2 obtained by applying f to every element of L1. Say f is a function that takes x and returns 2x. Then, map(f, [1,2,3,4]) returns [2,4,6,8]. reduce: Takes a binary operator f, a list L and a seed value (or identity element). It returns the seed value if the list is empty. Otherwise, it applies the binary operator f to the seed and first element of L, then applies f to the result of this and the 2nd element of L, and so on till L is exhausted. The result is returned. This can be seen as a generalization of factorial function. filter: Takes a boolean function f and a list L1. It applies the function to each element of L1, and list of those elements that give true is returned. #insmot

[@kirubhaharkannan5461]

Awesome

[@mandvi8887]

map function always returns an object. One need to convert to list explicitly.

[@bountyhead5537]

Thanks brother

[@kogurwarsrisai6947]

didn't get about reduce function

[@SumanGorkhali-z1k]

Perfect

[@vikrantthakur3818]

Finally found a cool programmeer who teaches these concepts in best possible way❤❤😇 Thanks navin sir

[@hrutikdhumal402]

this is one of the best python tutorial series for begineers and the main part is it is free thank you sir

[@sunilmaurya3815]

the form of steps u choose while teaching is unique and more understandable as compared to other lecturers thank u sir great explanation☺️

[@muskaan3206]

Sir, you have made boring topics interesting for us..i love your teaching method..Great job!!

[@NitinJainNoida]

In case anyone need more information about the difference between filter, map and reduce: Difference 1: 1. 'Map' takes all objects in a list and allows you to apply a function to it. The result is usually the same quantity of items as in the main list but with some execution(as specified in the function). 2. 'Filter' takes all objects in a list and runs that through a function to create a new list with all objects that return True in that function. Not necessary that it will output same number of items as present in the main list. Difference 2: 1. In Map you can use multiple iterables definition : map(function_object, iterable1, iterable2,...) 2. Whereas in filter only one iterable can be used definition : filter(function_object, iterable) Difference 3: Further in filter the function_object has to return boolean only. Hope it helps! :) #insmot

[@rahulvaswani8866]

thanks a lot

[@islamgoher]

Hey, Thanks for this clarification. but, you didn't mention the purpose of reduce function there :)

[@vivekpandey5142]

It's helpful

[@hemajeyalakshmi9106]

oh god! you are simply answering all the questions that pop my head. thank you navin. you have no idea what a great part you are holding in my life. because of you, im fearless and ready to learn programming. thank you for saving my life.

[@nehaaadarsh]

Lambda is my new crush ,😍😍❤️❤️ I love lambda

[@sidskywalker8423]

Indeed!

[@intelligentbrahman1572]

really pandey g,....i am also pandey............are u student??

[@sathvikmalgikar2842]

finally found a good tutor who does'nt just dump all the codes and and leave logic behind completely making it boring and useless to watch. really amazing sir.

[@pvinoth2146]

Hello Sir, Thanks so much for the lessons. I have coded factorial of a number using reduce functions. Its working:-) from functools import reduce s=[] n=int(input("Enter the number")) for i in range(n+1): if i==0: continue else: s.append(i) print(s) total = reduce(lambda a,b: a*b,s) print(total)

[@swarnimasingh1232]

"that's what programmers do, making things cool" and how cool he looks with that action ;)

[@harshwardhansingh617]

makkhan lagana band karo rre xD

[@webcreationstudio7088]

@@harshwardhansingh617 lol tum toh bare heavy driver ho

[@SumanGorkhali-z1k]

such a headache of lambda syntax clarified so simply. Thankx.

[@mohittrivedi1112]

Seriously your Python videos are amazing. kudos to you

[@uvishnuprasad2944]

from functools import * num = [2,4,5,6,7,8,9,1,0] odds =(list(filter(lambda n: n%2!=0 ,num))) square=(list(map(lambda a: a*a,odds))) sum=(reduce(lambda x,y: x+y,square)) print(sum)

[@HimanshuVerma-rr2ww]

So enjoyable your teaching skill. Really i am getting all this things free. Thanks sir great heads off.

[@MegaCherry0]

Class Moniter could you please let me know whether this channel has videos on python and are they easy to understand? Thanks in advance.

[@truthalonetriumphs6572]

"Hats off" is the expression

[@SaFFire123x]

@@MegaCherry0 This is a reply after 7 months but I can confidently say that this is the best channel for python. I regret not discovering this channel earlier

[@MegaCherry0]

SaFFire thank you so much buddy.

[@SaFFire123x]

@@MegaCherry0 you're welcome. I'm 7 months late though 😅

[@swethagopu3708]

Your smart explanation helps me to get out of my fear in learning python😍😍😍

[@murodjonsadullaev4674]

I like the way you teach us, Navin. I am learning a lot from your videos. From this video, I learned how to find Factorials of a number with just two lines of code using reduce. from functools import reduce print(reduce(lambda a, b: a * b, range(1, int(input("Enter a number: ")) + 1))) cool bro, really appreciate your help on learning python :)

[@yfjsdgzjdnfn]

Factorial!!!

[@divyeshkumarbalar7732]

i was married to java and its version 8 features; after watching this i am planning to cheat in my relationship

[@mukeshcheemakurthi7933]

you will be presented in the court if you do this :)

[@divyeshkumarbalar7732]

I will stay faithful to both Ill treat java as a friend (friendzoned)

[@sravanichowdary7755]

😝

[@sumaiyathameem5888]

😃

[@INDIAN-kq6yo]

Java will divorce you

[@rohithjohn959]

Sir...your teachings are awesome and you are a blessing to a lot of new programmers

[@PrasannaKumar-zx7gr]

Than you sir, after working out this problem myself in laptop, this become simple now... You are a greater teacher and thanks for making me to sit here till above 40 video series. Everyday waking up with your videos make my day very active.... Thank you!

[@deepwell8554]

You are a teacher of note ... not only a coder ... Thanks for the effort. If I can do anything to help you expand ( other than liking or subscribing ), let me know.

[@Vikranth4A5]

Navin sir can u make more videos and more concepts as soon as possible because we are understand very easy with ur explaination NOTE : TRY TO MAKE SOME PROJECTS AND SOFTWARE USING THIS CONCEPTS

[@DirisalaSandeepKumar]

demanding huh.....

[@tamaladhikari7950]

Comparaing it with java in java we have to use -> operator here only : and also here we have to write lambda

[@vrowmuria]

Many many thanks Navin for clearing the concept of Map Reduce. You are a gem. Super likes

[@allofmystuffs]

Legend says, the hardest part of programming is naming the variables.

[@wqwerisk2895]

Thank you! Wishing you all the best 🙏🏼

[@zakiasmaa6834]

"that's what programmers do, making things cool" ; thank you a lot Navin Sir

[@RaiyanAlphaRanger]

This is so amazing! I learnt a whole lot about not just lambda from this video, but also these three other useful (albeit advances) functions! Thank you so much!

[@uchiha_love]

I have watched so many tutorials and had no idea until i watch this masterpiece🎉

[@mattshubat]

Love how you kept in your mistakes. Very honest.

[@WanderEatLearn]

Very helpful to me. It's crystal clear. Prior to watching this video I could not understand filter and map.

[@shantabaikanade6075]

You are really a fabulous teacher 🤩🤩🤩

[@prashantbhatade6367]

After watching this video my all doubt got clear hats off to sir quality and method of teaching lit.. Tx

[@naveenpolasu4670]

Sir, Can you please start Machine learning with Python tutorial.

[@beecrofttobiloba1869]

Sir this is very necessary

[@asishraz6173]

After a long time, I finally understood the concept of Lambda, Reduce, Map function. Great video and well explained. Thank you so much sir. Now eager to learn more and more every day through your videos. Thank you so much, keep up the great work.

[@kaikobadshamim6118]

Your teaching technique is so lovely!!!

[@shivakumarreddyp8764]

This is the Beauty of python.... And sir hats off for ur teaching

[@أبوفاطمة_أبوعبدالله]

Your explanation is very awesome. Thanks a lot!!

[@ashutoshpatil26]

simple and clean Explanation thank you sir

[@italiens9905]

you are awesome teacher ever ... And your teaching style is really energetic

[@wwmcgregor9031]

Navin you are a great teacher!

[@meghhanigam8375]

You are the best.... no teacher ca teach like you

[@huzaifaelnaeem1620]

it's brief and clear .Thank you so much sir

[@voalcalisticTanmay]

I have made a use of lambda and map() method and would like to share .. And here is the snippet : a,b=[int(x) for x in input("Enter two values seperated with spaces : ").split()] tup=( lambda c,d : c+d, lambda c,d : c-d , lambda c,d : c*d , (lambda c,d : (c+d)/2)) dic=dict(zip(('Sum' , 'Difference' , 'Product' , 'Average'),map(lambda x : x(a,b),tup))) for j in dic: print("{} : {}".format(j,dic[j])) Hope this gets useful in some way. Thank You :)

[@pranaymane23]

Find average of list: from functools import reduce list = [1,2,3,4,5,6,7,8] ave = reduce(lambda a,b: a+b,list)/len(list) print(ave)

[@rohanram7197]

Navin sir you are a legend 🙏🏻❣️ Thanks again

[@chinmaydas4053]

Very important video but please sir try to upload more videos daily. After uploading complete series please sir make some projects/softwares.. it will be very helpful to understand the real world problems 🙏🙏🙏..

[@jaheerkalanthar816]

sir , U r my hero shall i tell in my mother toungue, Marana mass

[@allofmystuffs]

Sorry to ask. Which language.?

[@iloveyou-gk7cw]

@@allofmystuffs tamil

[@rehithkrishna543]

Thalaivar 🔥

[@mohammedumarfarhan9900]

This man is an absolute legend

[@nagendrabommireddi8437]

if we use for loop to seperate evens than it will take time complexcity o(n)..by using lambda what is the time complexicity

[@venupunna9940]

Great tutorial and by the way THANKYOU for making these videos AD FREE.

[@pareshdandane]

I saw you video after 2 months and editing level is whole different level. I got so much inspiration from you. thank you sir for making this video!!

[@BhuveshDhiman]

4:03 best part of the Video thank me later

[@Kirtidancevideos]

😂😂😂😂🤣🤣🤣

[@ShikharShukla99]

🤣🤣

[@arbaazkhan7533]

That scene was really funny The way he said

[@_.sunnyraj._]

😂

[@cnx_1441]

I thought your vids were useless at the first but then I understood that your vids r very helpful thank you soo much.

[@mahalingpreethi1021]

Sir, all lambda functions are working similar(filter(),map(),reduce()). Then what is the main difference between them. Among three which function is better to use.

[@shreyaswinividhyadhare9228]

Sir your class is fantastic, more understandable

[@lasithdissanayake]

this was the only tutorial I undestood about map filter an reduce

[@Think_differently955]

Great Playlist for Python. I like it. One doubt here, how a+b added all variables without using any loop?

[@mohitsharma4667]

if we have the list abc = [1,2,3,4] it will take the first two elements from the list and perform the function, the new list now becomes [3,3,4] the process is repeated till we have a single value

[@sidskywalker8423]

@@mohitsharma4667 for e.g , l = [2, 4, 6, 8] >>> reduce(add_all, l) 2 + 4 --> 6 6(2 + 4) + 6 --> 12 12(6 + 6) + 8 --> 20 final sum: 20 that's how reduce() works! :)

[@054_ritesh3]

The next level of awesome teaching

[@webcreationstudio7088]

code --> from functools import reduce def adding(a,b): return a+b def update(n): return n*2 num=[1,2,3,4,5,6,7,8,9,10] even=list(filter(lambda x:x%2==0,num)) print(f"even numbers are {even}") double=list(map(lambda x:x*2,even)) print(f"double of all the even numbers {double}") sum=reduce(lambda x,y:x+y,double) sum=str(sum).center(10) print(f"the addition of all the numbers ae present in the double are {sum}")

[@dipannita7436]

u makes the concept understandable

[@b.sasikumar2141]

I like the way of u teaching sir superb...... 👌👌

[@MukeshKumar-co5ky]

from functools import reduce lst = [2,4,5,25,21,66] evens = list(filter(lambda n : n%2==0,lst)) doubles = list(map(lambda n : n*2,evens)) sum = (reduce(lambda a,b : a+b,doubles)) print(evens) print(doubles) print(sum)

[@sumantharaja9224]

from functools import reduce nums = [1,2,3,4] odds = list(filter(lambda n:n%2==1,nums)) print(odds) x = list(map(lambda n:5*n, odds)) print(x) y = reduce(lambda a,b:a+b,x) print(y) Output [1,3] [5,15] 20

[@sufiyanmogal1527]

Sir please start with python on these weekend it will help those people who are watching your python playlist

[@a.rhithesh7711]

navin sir i am very happy for your lectures, its very clear cut and good ...a request form my side to plan videos on problem solving python, which is used for placements for some lakhs of engineering students...i am expecting that one.

[@ruwindarowel8200]

Hands down the best place to learn Python❤❤❤❤❤❤

[@atulayagupta785]

from functools import * numbs = [] n=int(input("Enter the number of value to be added:")) for i in range(n): a = int(input("Enter the value: ",)) numbs.append(a) result = reduce(lambda a,b : a+b, numbs) print(numbs) print(result)

[@fhdhejeh63]

you are helping many people sir. keep going

[@ngharish]

i knew lamda function but filter ,map and reduce is useful for handling huge data ... so thanks for video

[@abhaykanwasi881]

Big Data concept is so relatable for me to understand this concept.❤❤

[@vanshchauhan2373]

loved the method of your explaining

[@jyoshnadeepala4439]

1:05 , chris Evans should listen this😂😂. #CaptainAmarica

[@vivektanwar628]

perfectly explained thanks,,,was confused earlier

[@dineshr3841]

Really awesome explanation about this topic, I really love it and understood very well by ur way of teaching...🙏❤️

[@akshaydange846]

taking input from user performed all the map reduce and filter hope it will help anyone from functools import reduce nums=[] n=int(input('enter the elements')) for i in range(0,n): ele=int(input()) nums.append(ele) even = list(filter(lambda n:n%2==0,nums)) print(even) double=list(map(lambda n:n*2,even)) print(double) sum=reduce(lambda a,b:a+b,double) print(sum)

[@aakashmehta7336]

Hi Navin. Your videos are amazing. I am following your python series. I wanted to know from where did you learn the big data? I saw you said that you have learnt big data. Could you you please let me know the reference please? I want to learn big data.

[@memeea6484]

Thank you so much the only tutorial that i can actually understand!! ♥♥

[@emsshafeeq]

nums =[1,2,3,4,5,6,7] evens = list(map(lambda n: n % 2 == 0,nums)) print(evens) if the function is a condition then it will give true or false according to the input output : [False, True, False, True, False, True, False]

[@vakhariyajay2224]

Thank you very much. You are a genius.

[@vidhikumawat5876]

Navin sir thank you soo much for this series...I learned alot from this series...it is very easy and helpful..thank you soo much for your efforts ☺️☺️

[@ashishgaur862]

Awesome work sir and please make more videos like these and give us some projects and assignment 👍🏻💯

[@atulayagupta785]

numbs =[] n = int(input("Enter the number of elements you want to enter: ")) for i in range(n): a = int(input("Enter the value:")) numbs.append(a) evens = list(filter(lambda a : a%2==0,numbs)) print(evens)

[@iqbalhonnur4451]

Excellent explanation !!!

[@deepthireddy4036]

I really like the way you explain concepts❤

[@dreamphoenix]

Excellent teaching. Thank you.

[@easydatascience2508]

You can see mine too. Hope the Python playlist, step by step sequentially arranged by sections, will be valuable. Source files can be found in the description of the each video. There is another playlist , R beginning course in the channel too.

[@amitroy-kh1wn]

Sir, How can you describe so easily and understandably. Hats off Sir

[@inganzamarumpu]

all things are clear but i really like comprehensions

[@jitendrasharma4]

Very Nice explanation , Thank you

[@midhunm154]

f=lambda a: a%2 ==0 >>> nums=[1,2,3,4,5,6,8] >>> evens=list(filter(f,nums)) >>> print(evens) [2, 4, 6, 8] using lambda function..

[@hetpatel7918]

great presentation skills sir

[@harshwardhansingh617]

he said that these functions are not easy, but I found them so easy : P

[@chaithalikshetty480]

Sir all I can say is your perfect..

[@professor7032]

' ' ' He is Literally Great ' ' '

[@dishankshah5080]

After completing basic please make some projects.It will give us more help.

[@muhammadsultanularafin8846]

Wonderfully explained! Thanks.

[@oliviayeo5753]

LAMBDA 4:03 LMAO Thank you for the tutorial!

[@sasidhar5316]

from functools import * lst=[1,2,3,4,5,6,7,8,9] even=list(filter(lambda n : n%2!=0,lst)) double=list(map(lambda i : i*2,even)) add=reduce(lambda a,b : a+b,double) print(even) print(double) print(add)

[@atulayagupta785]

list = [] n = int(input("Enter the number of elements you want to enter: ")) for i in range(n): a = int(input("Enter the value:")) list.append(a) if a % 2 == 0: print("It is an even number : ", a) else: print("it is an odd number") print(list)

[@dadmehrtatality1144]

Hey man tnx for your help I was really confused but now I find it out !!😍