THIS Will Make Your Colleagues Mad In Python #learnpython #python #programming

This will make your colleagues mad in Python. #learnpython #python #programming

▶ Become job-ready with Python:

▶ Follow me on Instagram:

[davidgillies]

A modern C or C++ compiler will optimise multiplication or division by powers of two into shift operations.

[MonkFeet]

Wow! Another way to make my code more confusing, and with the -~ operators, too! 💀

[fractalmadness]

There’s a video out there that did this on fibonacci numbers to run them more efficiently.

[kadircalloglu]

It is more efficient to use it in enum numbering, it immediately acts as a header

[Scousestrongmanfan]

i notice in these vids the value are usually put as number: Int = 100 doesnt python already recognise integers based on how theyre inputted? Like if you put number = 2.5 it wouldnt need to be typecasted as a float because the . is there?

[KennethHaldbk]

I do this very much, but only in VHDL 😂

[DumToasty]

The sad bit is that for some reason bitwise division or multiplication with 2 like this is somehow slower than using * 2 or // 2, same with & 0b111 instead of % 8 (on this I know the & checks all bits instead of just what is necessary like with modulo), etc. I wonder why this is, or if there is a way to make bitwise operations outperform arithmetic.

[miss-astronomikal-mcmxcvii]

Makes sooo much sense now. Shift left, you’re shifting to a factor of 2^1 = 2. Shift right, you’re shifting to a factor of 1/(2^1) = 1/2 = 0.5.

Thanks for the tip!

[steff]

Have you studied the Bitcoin Code and found the halving?

[janisir]

Do not do this, this is silly, only use bit shift operators if you actually want to bit shift logically.

[michaelschmid]

Two questions, if you need Performance why Python?
And a 2nd one, why cant Python make this optimization under the hood automatically?

[tigerbojiteol]

Sure, but what’s the use? Can someone explain where and how this could be useful?

[BohonChina]

yeah, the exampls is silly, I give a usefule example.
(quake 3 )fast inverse square root algorithm, it use bitwise operations and magic constant.

to calculate ipv4 address subnet mask, you have to use bitwise operator.

[Zarya.]

Its not funny but actually practical when coding in binary

[Grinwa]

Some low level programming in python 😂 love it

[florunio]

"Right to divide, and left to multiply", sounds really political lol

[jgoep]

What about right shift of uneven number?

[not_eagleye]

he keeps finding more tricks somebody stop this man

[WojciechowskaAnna]

its silly, its like using micreoscope to observe.. birds. Python is a slow language good for prototyping, binary operations usually make sense for performant code that allows for real memory management

[BehruzZoirov-ifkw]

I'm 🇺🇿
A>>B -> A/2**B
A<<B -> A*2**B