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Python lambda, map, filter, & reduce - Higher Order Functions for Beginners
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Күн бұрын
@xzex2609 11 ай бұрын
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
@Leesdjo Жыл бұрын
Thank you Dave. I have learned lots from you as a student when I first found out about your KZfaq channel. Thank you for your kindness.
@insteresting 9 ай бұрын
Very nice tutorial, Dave!
@OneStopMusic. 2 ай бұрын
great and to the point explanation
@TannerBarcelos Жыл бұрын
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 Жыл бұрын
Thank you!
@xzex2609 11 ай бұрын
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
@danielurbanowicz7882 4 ай бұрын
Solution for reformat lambda by vs code is to put parentheses around the lambda assignment: squared = (lambda num: num * num) 😃
@xzex2609 11 ай бұрын
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
@xzex2609 11 ай бұрын
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.
@sonamohialdin3376 Жыл бұрын
Very helpful tutorial thank you very much
@DaveGrayTeachesCode Жыл бұрын
You're welcome!
@ggff2269 Жыл бұрын
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 Жыл бұрын
Duplicate question and this time on a Python video?? I answered under the appropriate Next.js video.
@johnaweiss 7 ай бұрын
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.
@aniruddhadas2953 Жыл бұрын
Thank You,Sir.
@DaveGrayTeachesCode Жыл бұрын
You're welcome!
@obiemmanuel354 Жыл бұрын
I love your contents a lot sir
@DaveGrayTeachesCode Жыл бұрын
So nice of you!
@obiemmanuel354 Жыл бұрын
@@DaveGrayTeachesCode I'm a beginner but hoping to get somewhere with your contents
@latesttrendzs Жыл бұрын
Hey dave ! Just curious to know how coding teachers on KZfaq like you get there knowledge from. Where they get to know so details of those coding languages?
@DaveGrayTeachesCode Жыл бұрын
Documentation, books, other articles and tutorials, and experience - no secret or shortcut here. I teach at university and the same applies there.
@alexanderkomanov4151 Жыл бұрын
Thanks!
@DaveGrayTeachesCode Жыл бұрын
Welcome!
@netronominom2850 Жыл бұрын
Your videos are amazing Is it possible to make a tutorial for decentralized crypto exchange?
@DaveGrayTeachesCode Жыл бұрын
Thank you! I have not gotten into crypto coding. There are some good channels for that.
@johnaweiss 7 ай бұрын
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.
@JHunterJoe 11 ай бұрын
it re formatting because your not calling the lamda function right
@utinthein7274 Жыл бұрын
Thank you, sir
@DaveGrayTeachesCode Жыл бұрын
Welcome!