Python lambda, map, filter, & reduce - Higher Order Functions for Beginners

[@xzex2609]

he is such a great teacher and I actually am learning JS from his channel . and even though I know python for years still enjoying to see his way of teaching. thanx

[@SonuSharma-sb4bo]

Amazing teaching skills! 🎉 This tutor deserves millions of subscribers.

[@Leesdjo]

Thank you Dave. I have learned lots from you as a student when I first found out about your KZbin channel. Thank you for your kindness.

[@insteresting]

Very nice tutorial, Dave!

[@TannerBarcelos]

I feel like seeing this in JavaScript before Python helps folks understand it even better. Sure, lambda arg: are a little different than ()=> but given Python isn’t functional in nature, I noticed many folks find this to be confusing. You did an awesome job explaining it!

[@DaveGrayTeachesCode]

Thank you!

[@xzex2609]

once you see its actual use cases (call backs ,....) you will find that the lambda is a very effective tool you can't do without , maybe that's why pep-8 recommends that lambda should not be assigned ,cause its own use cases are very special , like in GUI programming if a widget need to pass one or two parameters to a function , you can not use a function for that unless you wrap your function inside an otter function that calls inner function to have a return value , but a simple lambda expression will save the day and you don't need to even define a function even if your command is a function like print( argument) you can't use () in your command= in your widget and you had to wrap the print inside a function otherwise print returns None but by using lambda you simply can use Button(......, command=lambda:print('string')) or command = lambda event:print(event). otherwise you got to use a higher order function (nested wrapper / inner) function

[@muzhaffarhaydar7928]

thanks dave!

[@OneStopMusic.]

great and to the point explanation

[@johnaweiss]

6:00 Would be helpful if your commented lambda rewrites inluded the var name as you had originally entered. Without the var name, the commented lambdas are not equivalent to the defs.

[@danielurbanowicz7882]

Solution for reformat lambda by vs code is to put parentheses around the lambda assignment: squared = (lambda num: num * num) 😃

[@xzex2609]

According to PEP-8 anonymous functions better not assign to a variable their use is more like call backs like arr.sort(key = lambda data:data[0]) and other stuff like that. but visual studio doesn't apply the pep-8 unless you install an extension. I remember the extension was very annoying , but now see it as a tool to learn pep 8 standards in the action to write better code.

[@xzex2609]

once you see its actual use cases (call backs ,....) you will find that the lambda is a very effective tool you can't do without , maybe that's why pep-8 recommends that lambda should not be assigned ,cause its own use cases are very special , like in GUI programming if a widget need to pass one or two parameters to a function , you can not use a function for that unless you wrap your function inside an otter function that calls inner function to have a return value , but a simple lambda expression will save the day and you don't need to even define a function even if your command is a function like print( argument) you can't use () in your command= in your widget and you had to wrap the print inside a function otherwise print returns None but by using lambda you simply can use Button(......, command=lambda:print('string')) or command = lambda event:print(event). otherwise you got to use a higher order function (nested wrapper / inner) function

[@sonamohialdin3376]

Very helpful tutorial thank you very much

[@DaveGrayTeachesCode]

You're welcome!

[@aniruddhadas2953]

Thank You,Sir.

[@DaveGrayTeachesCode]

You're welcome!

[@obiemmanuel354]

I love your contents a lot sir

[@DaveGrayTeachesCode]

So nice of you!

[@obiemmanuel354]

@@DaveGrayTeachesCode I'm a beginner but hoping to get somewhere with your contents

[@latesttrendzs]

Hey dave ! Just curious to know how coding teachers on KZbin like you get there knowledge from. Where they get to know so details of those coding languages?

[@DaveGrayTeachesCode]

Documentation, books, other articles and tutorials, and experience - no secret or shortcut here. I teach at university and the same applies there.

[@ggff2269]

Hey Dave, i am facing very slow compilation time in nextjs . A single change in file takes upto 60 seconds to appear and takes upto 2.5 gbs of ram. Also i am not using additional packages. I have noticed 1000s of devs facing same issue. How do you encounter this? It is very frustrating. It should have to be fast like vite. 😭😭😭 I really started hating it now but have to use it for SEO 😭😭😭😭

[@DaveGrayTeachesCode]

Duplicate question and this time on a Python video?? I answered under the appropriate Next.js video.

[@netronominom2850]

Your videos are amazing Is it possible to make a tutorial for decentralized crypto exchange?

[@DaveGrayTeachesCode]

Thank you! I have not gotten into crypto coding. There are some good channels for that.

[@johnaweiss]

1:34 My vscode doesn't do this conversion, so i'm guessing you have a formatter extension installed, such as "black". So that's not a native vscode behavior. 15:01 My vscode doesn't move imports to the top. Again, i'm guessing you have a formatter extension.

[@oldgamer1299]

Just in case you didn't resolve this, install autopep8 extension

[@utinthein7274]

Thank you, sir

[@DaveGrayTeachesCode]

Welcome!

[@JHunterJoe]

it re formatting because your not calling the lamda function right

[@alexanderkomanov4151]

Thanks!

[@DaveGrayTeachesCode]

Welcome!