THIS Will Scare Python Devs #python #code #programming

This will scare Python devs. #programming #code #python

[chri-k]

when you think you know the extent of python's cursedness is it always proves you wrong

[yellowsaint]

that is horrifically brilliant and i love it

[ApprendreSansNecessite]

I was reminded of this video today by someone who did not understand it and it made me realise the explanation of what is happening does not make any sense.

"I'm going to create a lamda with an underscore which calls that lamda immediately".

That's not it. You create a lamda which takes a function `_` as a parameter, and you call that function `_` in the body of the lambda. Then the decorator applies your lamda with the function that is defined beneath it. and assignes the result of this invocation to the name `start_time`. That's what's happening.

The immediately invoked part of the video is the property of using the lamda as a decorator because any decorator is always invoked the moment you use it and the lambda invokes its parameter the moment it is itself invoked. The fact that a value is assigned to what normally would hold a function is due to the fact the function `_` is called instead of being returned, as would normally be done with decorators.

Hope this helps

[poijmc]

It's one of those things you wish to use in a codebase but you know it will make it unreadable

[Israel]

When a JavaScript programmer meets python

[papuce]

Now I want to put this somewhere in our code just to prank the fellow devs lmao 😂

[cevucty]

Now, functions can act as property without having to be a method of a class

[motbus]

Great. No one should ever think on using it

[jackalakalaka]

Why can’t the start_time function just be defined and then right under it we have “start_time = start_time()”?

[tomasslavik]

It looks like a way how to make your own "keywords" in Python. :D

[darske]

Well, if you really understand decorators it is not weird at all, it's like creating the function and then saving its own result value on its own name. Something like:
Start_time = start_time()

Since the function returns a string, from now on start_time is a string

[volodyanarchist]

Is it really a variable? Can you change it?

[YoKKJoni]

nice!
its like the decorator that runs on any exit contidion

[kianmengkuak]

means with this code we no need to set up a variables to collect the data that return from start_time function right? That is great, thank you

[programmershourya]

Hey @indently it would be better if you also explain it’s practical real world use case Thnks

[memoking]

Someone can explain it to me how this work

[antoniong]

This looks pretty similar to LazyStatic or LazyCell in Rust. If I'm not wrong, it desugars into a function under the hood, but you would use it no different to calling a static Variable.

I think one realistic use case is loading the System's language (which woukd explain why would Windows prompt some apps might need to be restarted so to reflect language changes)

Edit: Typos

[joshdean]

Just execute that code at the top of the module… you’ve created a variable with extra steps

[smackdatascot]

I would like to see the unit tests for this... all of the viable ones... haha

[chrisl.]

Nothing to do with “abusing decorators” and completely useless. Just declare the date variable when your code starts, it will achieve the same thing.