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What is The Walrus Operator in Python?
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- Опубликовано: 14 авг 2024
- Today we learn what the Python Walrus operator is and when it should be used.
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Timestamps:
(0:00) Intro
(0:22) What is The Walrus Operator?
(3:53) Use Case 1 - Menus
(7:38) Use Case 2 - List Comprehensions
(12:12) Outro
The example with list comprehension was nice, I always wondered if this was possible without calling the same function twice, I will use it for sure
Nice I didn't even knew this one exists lol
Now you know! :)
@@NeuralNine yeah ty
I saw the walrus operator in the wild a few weeks ago and I couldn't find a decent explanation of its purpose in Python. I was pretty pumped when I saw this video pop up in my feed.
Happy to help! ^^
Same
its almost like.... google knew what to recommend to you =]
Thanks for the great content!
in the first example if you did not use () between the walrus and the non equality operator then the lower priority of the walrus operator would cause a problem.
you can not use command := input() != 'q' ; unless (command := input) != 'q'
Bro your examples was awesome! thanks
I've been using it for quite some time. This actually makes doing certain tasks easy.
Sir make a video on Google map clone from python.
Is this potentially something that a compiler could "figure out" at run time, and "optimize" what actually gets run toward the more efficient method of doing it?
Idk the formal words to use, I just know I've seen comparisons between python and C, and shown that certain things written in python that might look "not optimal" is actually interpreted by the compiler at run time and "figured out" and "made" more efficient by using the "actual" best method that should/could have been used
Wow this is very helpful specially for while loop. Thank you so much
As for the last example, doesn’t Python interpreter optimise it automatically? As far as i know in C if you call function with the same argument for a few times its result is kept in memory. This optimisation is made by compiler
You are actually right, even though i dont get why when i try simple code it id about always faster with walrus, but i think C only store hashable value although im not 100% sure
Always teaching new stuff thanks Man
Easy to understand
also known as an assignment expression, amazing stuff
Amazing!
Good video 📸 👍
Awesome tutorial
I have seen some code with colon in the function.
def my_func(int : something):
pass
If possible please make a video on what this is and how it works.
Thanks
its called type-hinting, meant to show the person using the function what type should be passed in
@@goldenaxe2924Thank you.
I'll look up for more info on type hinting.😊
The most unknown is
A @ B
Another interesting use case might be if you do list comprehension in combination with slow rest requests for example.
There are many more good uses for the walrus operator. Some of the uses can be found in James Powell's vids...
So this is basically a simple C++ assignment opeator, right?
i remember reading about this when they added it and not understanding anything
Now you understand it hopefully! ^^
You look like "TechWithTeam" channel but older 😹
I think its a nice Idea to know, but its the opposite of a pure "function" in the context of functional programming.
Good Job!
would prefer readability for future sanity purposes..
good tutorial though..tks
Why are your other videos which are very important to us are not clear as this one?
Yo I just downloaded python 3.10.0 and I don't have any of the things you have. Like the side bar and the top bar. Is there something i need to set up to get those? I only have the black command console.
Epic
hello sir I want to create a ml+ai bot that operates a small machine to operate that machine it will learn from the videos ,but the problem is that how should I make it learn from the videos
lol thats not how machine learning works
@@anonlegion9096 bro long ago internet was not expected to create a suitable means of communication but still we got a breakthrough so I hope there will be a way to get it done
@@programminghero432 What?? Can you even tell me what kind of machine learning model your brilliant idea would be? Classification? Regression? What?
@@anonlegion9096 I dont know that's why I am asking to get some clues
The problem is that lines tends to get too long.
Guido von Rossum quit his gig as THE Python guy over the walrus operator. Not so much the operator itself as much as the bitter fighting that erupted over it's inclusion.
Part of the argument was that if == vs = could cause problems, imagine what kind of trouble you could get in with accidental assignments when you really just wanted a boolean result.
There were many in the community that felt non explicit assignments were as evil as the reviled 'Goto'.
Sorry I had to use language like that here, but sometimes just have to man up and know there were in the past forms of code worse than Stalin, Mao, and Hitler combined.
Funny thing is, the same peeps that loved goto hated recursion. Having a subroutine call itself was considered extremely naughty back in the day.
really hard to belive, as for example, quicksort being a 1959 sorting algorithm, is based on recursion
@@Neuroszima Yes, it is hard to believe. But it is true. The old line was : it's good for solving Towers of Hanoi and that's IT!
Don't ever do this, Bad, Bad, Bad!
Since then it has become an entire paradigm.
Funny thing is, personally, I hate functional programming.
Luckily I knew abt that one.
TIL the Walrus Operator is called the Walrus Operator because it looks like a Walrus. Literally had no idea what it's purpose was until this video.
don't tell me this is something that very little people know about, i have waited for this operator to be added in one of the languages since i programmed in Pascal!
glad i knew this last two weeks ago.
Why, you had an interview "last two weeks" ago? Just kidding lol
are u lil supa?