Cython makes Python INSANELY FAST

Рет қаралды 32,304

Жыл бұрын

Python has a bit of a reputation for being slow, but with just a little bit of effort, it can approach the sort of speeds you could expect from C. Wowsers.
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Пікірлер: 51

@Carberra Жыл бұрын

Thanks to Mitko for pointing this out - due to an oversight in my implementation, the benchmarks for the factorial function are actually incorrect. This doesn't degrade the educational value with regard to the syntax, which is all fine, but I thought I'd just mention it. Moral of the story: be careful around big numbers!

@MitkoNikov Жыл бұрын

Wait! You don't check if the answers are the same! I suspect if the code is converted to C/C++ without using Python's int object, it overflows and that's why it's way faster. It should be way faster eitherway, but does it properly use the python int object or just uses the primitive 4 bytes integer in C/C++?

@Carberra Жыл бұрын

You are...right. Fuck, how did I not notice that? Thankfully I don't think it kills the educational value with regard to the syntax, but I will update the thumbnail to reflect the speedup from the sorting, which I've confirmed as legit.

@shner6742 Жыл бұрын

Yo this is awesome bro, I run this code and it was actually 1867.571 times faster using Python 3.10.7 and C++ 14.0 (for the factorial() example)

@traversis Жыл бұрын

Excellent video! New to Cython, but when I tried this without importing the cpython array it worked with similar speedups. Maybe they changed something in the last 6 months?

@Carberra Жыл бұрын

Entirely possible. I haven't really gone back to this since the video so I couldn't tell you. It's possible the speed was roughly the same anyways.

@pietraderdetective8953 7 ай бұрын

Great video! More videos on Cython please! In the video you mentioned the pure python mode didn't give the level of speedup of full Cython syntax...I experienced the same. Is this behaviour to be expected? I would rather write full Cython syntax if that's the case.

@Carberra 7 ай бұрын

Thank you! I believe so, as using Pure Python Mode requires the use of cpdef where cdef could be used in pure Cython. That's my understanding of it anyways, if I'm honest I haven't really done much with Cython since making this video!

@colly6022 10 ай бұрын

i'd assume the .so file is the same as every other .so file: a shared object. basically, a dynamically linked library.

@williammcenaney1331 2 ай бұрын

You might write some Common Lisp params to benchmark them against Python programs solving the same problem. Common Lisp types dynamically. But some programmers wrote operating systems in it to run them on computers designed to run Lisp programs. Common Lisp lets you speed up your Lisp by statically typing some variables.

@ripsirwin1 6 ай бұрын

Can you call numpy functions from within a cython kernel?

@divingradish Жыл бұрын

"so" in "*.so" files stands for Shared Object.

@Carberra Жыл бұрын

I see -- I had a hunch but wasn't 100% sure. Thanks for confirming (:

@grimonce Жыл бұрын

so, is a shared object, something like *.dll in Windows platforms...

@IARRCSim 13 күн бұрын

I wonder if PyPy could use some of its thorough data type analysis of Python code to convert Python to Cython. PyPy does JIT compilation but I wonder if mixing PyPy with Cython tools could lead to better performance.

@furkanesen Жыл бұрын

Thx you.

@Carberra Жыл бұрын

You're welcome (:

@user-wr4yl7tx3w Жыл бұрын

Can you call existing c math functions like matrix multiplication?

@Carberra Жыл бұрын

Yep. The documentation shows how, but I've never really tried it.

@richardbennett4365 Ай бұрын

Use deques (double-ended queues) instaed of lists in python if one wants fast execution times. It's why they are a part of python.

@Carberra Ай бұрын

I recently made a video talking about this, if you're interested.

@ritikranjan7192 Жыл бұрын

naise

@rolfjohansen5376 10 ай бұрын

how are classes with user functions represented in C?

@Apuryo 3 ай бұрын

no classes in c. use c++

@tristotech 6 ай бұрын

Step 1: ask ChatGPT generate simple python program for hard task Step 2: Cython generate C code Step 3: Ask ChatGPT to simplify each Cython code files Step 4: Go back to step 1

@hammerheadcorvette4 2 ай бұрын

ChatGPT is not the end all be all. It's cool sure, it's not infallible.

@asianman1329 Жыл бұрын

Could you do a video on mypyc?

@Carberra Жыл бұрын

I certainly can! Planning on doing a video on that for next week (:

@asianman1329 Жыл бұрын

@@Carberra sweet!

@richardbennett4365 Ай бұрын

Use numba in oython. Vastly simpler, and IT DOES GET ONE TO THE SPEEDS OF C. Also, there's pypy3 and codon, a language tgat uses python syntax, but is compiled, so wicked fast. 😮

@Carberra Ай бұрын

I've made videos on both Numba and PyPy, if you're interested.

@PeterRichardsandYoureNot Ай бұрын

So confused. In the second example. Why did you have to make a separate cpdef list function ? I don’t see how it is even referenced from the first routine? I thought the whole idea was just to Cython existing code. This is very odd as it looks like you have to add a bunch of anscillary code to make it work and how would you even know what to put? My brain hurts now.

@2sourcerer 9 ай бұрын

Javascript also has to check types. Why is it faster?

@RuslanKovtun Жыл бұрын

You can't get 1000! fit in int64. Python's `int` contains all the digits, while C's `int` overflows silently.

@birdbeakbeardneck3617 10 ай бұрын

I thought all the cython stuff in the .so file makes it so the int allocate more space

@abschmit 7 ай бұрын

100,000! doesn’t blow up the max int value for C? That seems suspicious. Might want to verify that the outputs are the same.

@AlexeiFarWest 7 ай бұрын

Factorial 1000 will overflow your int. C doesn't care about the overflow, python does.

@dipeshsamrawat7957 2 ай бұрын

Could you please make a series of Cython? It's really amazing. 💯 Thanksgiving.

@Carberra 2 ай бұрын

If only I knew enough about it to say I was confident making a series on it 😅 I do keep meaning to go back to it and learn it more, just finding the time to do so atm is tough.

@dipeshsamrawat7957 2 ай бұрын

@@Carberra I can understand your hard work. Please proceed with the action in the future if feasible. Thank you.

@jfk1337 Жыл бұрын

how can cython modules be pip installed?

@Carberra Жыл бұрын

Same as any other module.

@jfk1337 Жыл бұрын

@@Carberra And pip automatically builds the .so?

@Carberra Жыл бұрын

Cython builds the .so files. You then include the .so files in your distributed package, and pip will treat it like any other file.

@desertfish74 Жыл бұрын

@@Carberra and this makes your code no longer portable

@richardbennett4365 Ай бұрын

😮😮😮 Oh, no. The narrator said, "can be RAN." NO. CAN BE RUN. The word be is right there, so the past participle form must be used of the verb to run, not the past tense form of run. Run, ran, run. It's not run, ran, ran. That woukd be incorrect.