SIMPLIFY your code with decorators (+ typing)

Decorators are amazing in Python, but have a habit of tripping a lot of people up! This video will cover the basics of creating simple and parametrised decorators (also known as decorator factories), as well as how to type them.
00:00 - Intro
00:49 - Creating a simple decorator
05:59 - Typehinting simple decorators
08:25 - Creating a parametrised decorator (decorator factory)
12:18 - Typehinting parametrised decorators
13:31 - Outro
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#python #coding #howto

[@ThijsFranck]

Thanks for highlighting ParamSpec, I've been looking for a way to define generic function parameters in Python forever!

[@jake115577]

I never would have come up with the UNITS trick! Great video sir.

[@pythonwithjames]

This is great, really loved the explanation!

[@Carberra]

Thanks man! I tried to be very thorough about it cos I get asked about decorators quote a bit, and see quite a lot of confusion about them elsewhere too.

[@MaxShapira2real]

Love it! Awesome job as always. Could you share the link to the video that shows how type-parameterized decorators were cleaned up and made less messy?

[@Carberra]

Thanks! Soz forgot to link it kzbin.info/www/bejne/lYK7nZWth9Kknas

[@yousefsaddeek]

look my local network was off and i was codding python for a little open source drawing app and i am constantly thinking about how to make it simpler and i remember that there is something called decorator in python and i thought it would be nice to use them and i spend few minutes to remember the exact sentax for decorators and i got the most part but what is driving me crazy how dose this video showed up immediately when the internet is back in my feed and since the internet was off I did not even think to use Google search or any kind of app and so you imagine the situation correctly I don't usually look for any python syntax or feature like it's so damn rare ☠️☠️☠️

[@Micaeljm]

Great video! I was hoping you would show how to make a decorator that supports both `@timer` and `@timer("ms")` (with or without arguments) at the end, which is something that I can never remember how to do right.

[@Carberra]

Glad you enjoyed! And I cover that next week!

[@thomaseb97]

python generally has really bad syntax for functional concepts and such, it's very opinionated on being object oriented and imperative the type hint for a function is really bad, it can get very bloated with the Callable[[T, U], R] especially when nested and lambdas are not implemented well nor are the syntax intuative using TypeAlias from typing is very helpful to help with the bloating of Callable

[@duffydan26]

Can you cover meta classes in Python?

[@Carberra]

Already have! 😄 kzbin.info/www/bejne/hKvdfIeNnsaBbJo

[@sto3359]

Great tutorial, but the guy has some serious David Koresh vibes going on :(

[@Carberra]

Wasn't expecting to get compared to a cult leader today I'll be honest.