Python Decorators 2: Decorators with arguments

[Yousifalzoubi]

I watched many videos about decorators, and I didn't understand decorators until I came across your video. Thanks Sebastian. You are a good teacher ;)

[serjikisagholian]

Thanks Sebastiaan, your Python video tutorials is really the best.

[YellowCardx]

Helped me a lot in a project im working on. Thanks!

[Superogobongo]

Found the eyebrow thing at 3:13 hilarious, hehe. But fun aside, you are a great teacher, than you very much for your videos.

[rickklein]

I agree with Serjik, your tutorials are very good. I finally grokked decorators, thanks.

[evgenykuznetsov]

Sir, i admire of your ability to explain.

[Erwipro]

Heel mooi! Ik vind deze uitleg over decorators met argumenten duidelijker dan die van Corey Schafer :)

[liuyu]

Thank you again for this very detailed and powerful decorator class! I love it! And it is elegant enough!

[darshanv]

Thanks amazing explaination doubts cleared

[Endredos]

I feel like decorators could be very useful and elegant especially in large software projects but for some reason I can't really think of a concrete use case. Could someone give an example where the real benefits of decorators are shown?

Btw: found your channel recently and love it!

[thebuggser]

Another great video. I agree that the solution presented is not particularly elegant.

However, the explanation was!

Thanks!

[srinivasaraoyp]

Very interesting Sebastiaan, thank you very much.

[slimyelow]

I'm on fire today !! Thank You Sebastiaan !!

[deserve_it]

We can also use parameters like this:


def power_of1(func):
def inner(param=2):
return func() ** param

return inner


@power_of1
def random_odd_digit1():
return random.choice([1, 3, 5, 7, 9])


print(random_odd_digit1())
print(random_odd_digit1(3))






def power_of_something(func):
def inner(param=2):
return func(param)

return inner


@power_of_something
def random_func(power):
return random.choice([1, 3, 5, 7, 9]) ** power



print(random_func())
print(random_func(3))



 It not requires any additional checks whether the parameter is a callable object.



You have great tutorials, concise, easy to understand and code is very creative. May be after those three tutorials I will start to use decorators, because I always have known that them exist but actually never had used them and most important, didn't understand why do I need all this humbug.

But after this explanation it looks like it is can be some usefulness in this stuff.

[MostafaMASLOUHI]

Thank you very much for this detailed tutorial. But I am confused about how decorator (inside power_of) can know about fnc ! since there is no link between them !

[AyushMandowara_xx]

So, that's how Flask makes that app.route() work?

[judeleon]

Thanks Sebastiaan, for this great tutorial. Can you please explain how one can implement class decorators with optional arguments, for example, as we have in functools LRU_cache?

[adamstrejcovsky]

Could someone explain, how to decorate function with a decorator, that takes paramteres like this while not using the @. I don´t get how Python understands, that it is the function below the @decorator, it is supposed to take as argument.

[petrockspiracy]

I can't get decorators to work with instance methods

[Maxiker]

At some case you might think that decorated functions are like js callbacks