Slots make Python FASTER and LEANER

[@Chalisque]

Something else about the __slots__ attribute is that it is immutable and is shared between all instances of the class. The following illustrates class A: def __init__(self,x,y): self.x = x self.y = y class B: __slots__ = ("x","y") def __init__(self,x,y): self.x = x self.y = y a = A(1,2) b = B(1,2) a1 = A(1,2) b1 = B(1,2) print(a.__sizeof__()) # 32 print(b.__sizeof__()) # 32 print(a.__dict__.__sizeof__()) # 88 print(b.__slots__.__sizeof__()) # 40 print(a.__dict__ is a1.__dict__) # False print(b.__slots__ is b1.__slots__) # True

[@Carberra]

Oh nice, I was actually unaware of both these points! Even better than I thought lmao. One additional point on top of that is that child classes inherit slots from parent classes, and can be extended by defining a new set of slots.

[@Pedro_lopes22]

You should research before doing a video. That video explains almost nothing about slots.

[@SillyLittleMe]

This is the first time i am hearing about this, but it is such an important concept! Good video, keep it up!

[@Carberra]

Thanks man! Yeah it's omega useful.

[@SeriouslyTechy]

Awesome video man, for some one thats been working with python for 4 years, this was news to me. Also, explained amazingly, no fillers, no wastage of time. Definitely subscribing for amazing future content

[@Carberra]

I appreciate that man, glad you enjoyed it! Yeah it was a good few years before I learned what they were as well, maybe about the 4-year mark as well actually.

[@Kilogya]

I'm half a year using python and I'm glad to hear about this. I'm subscribing.

[@Carberra]

Appreciate the support my guy!

[@zalmanbelinow7139]

Cool video!

[@KeyserTheRedBeard]

neat video Carberra. I killed the thumbs up on your video. Continue to keep up the solid work.

[@Carberra]

One murder = one happy boi. Thanks! (:

[@biskitpagla]

How does this work wrt type hints?

[@spatialnasir]

Never heard of it but, thanks to your video, it's now done and dusted.

[@Carberra]

Glad I could help out (:

[@chalkypj]

Thank you for this, really helped my understanding

[@Carberra]

You're welcome! Glad it helped (:

[@karixening]

That is cool. I'd kind of like it if the behavior was flipped, where the slots style was enabled by default, and you would have to explicitly enable the extensible dict functionality 🤔. Cause I consider doing that kind of a bad practice. Not sure how that would work though, unless the slots defaulted to whatever props you assigned the class in the constructor.

[@Carberra]

Slots is pretty new, so would require a breaking change to swap it round. Makes me wonder if will be the default in Python 4 though -- there are a lot of things Python 3 added that are optional, but should be defacto.

[@robertsjoblom9279]

How's it work with inheritance?

[@Carberra]

Slots are inherited automatically. To extend the slots for the child class, you create a new slots, and Python uses them both to determine what it can and can't use.

[@johanohlin9945]

Very helpful!

[@fusionsid270]

yo thanks I didn't know about this before

[@0xtz_]

Very interesting hmm we need more

[@NachoooX0998]

Loved it, slay sis

[@yato3335]

When you use timeit, you can pass definitions used in the code as "globals" parameter.

[@Carberra]

Would you pass the name of the function or the function itself?

[@yato3335]

@@Carberra Something like this timeit(code, globals={"Profile": Profile})

[@Carberra]

Oh okay cool, thanks for the tip!

[@monsieuralexandergulbu3678]

Remember kids, profile first

[@MangoNutella]

"mail" haha

[@Carberra]

Hm?

[@MangoNutella]

@@Carberra You wanted to type "male" but did "mail" instead two times haha

[@Carberra]

Oh right lmaoooo. I am letter.

[@re.liable]

Anyone know why it is named "slots"? I wish it was called "attributes" or something more intuitive haha

[@Carberra]

That's actually a very good question. I can't seem to find any official reasoning, perhaps other than that other names were considered too long (though that wouldn't discount "attrs" being used, so I'm not sure).

[@DBZM1k3]

I assume its supposed to be a slot in memory that is accessible.

[@timstevens3361]

faster n leaner like C ?

[@Carberra]

No haha. For that you'd need something more sinister such as Cython (doing a stream on that tomorrow *cough plug cough*) or PyPy.

[@etchris]

Ethan . . . 23 . . . uhhhhhh that's me

[@Carberra]

Dude wut, that's spooky 👀

[@helish_88]

you're "mail"

[@Carberra]

Looks like I'm the only person that didn't notice this lmao.

[@overloader7900]

Now we just need to add an ability to force types, and oh wait thats just c++ with a bunch of libraries