Python Decorators Made Easy 

Obrigado, não estava achando o motivo que ele imprimia None kkk

Nice one.. that was giving me errors not anymore ..

This is what I'm searching for too. I understand how it works, but I don't understand why it's any better than writing a proper function that handles it's own checks in the first place.

Yes otherwise it will show 'None' value

If you have to add the check to multiple functions, or you only want to temporarily modify the function, this is useful

I'm still trying to figure this out myself. (And since you ask this a year ago, you probably are good to go by now lol) But I know they can be useful when building a webapp, using something such as Flask. Inside your main Python file, you will have functions that will execute when some visit a page, and as you build it out, using decorators defining different routes can help you add multiple endpoints/routes to the same function.

​@@samiam.402 @David Pham One such scenario is when you wish to wrap behaviour around a function, such as a logger. Another such case is when you want to take third party code (code you cannot change, like a library) and add functionality to it. You can simply wrap their functions with your decorators to get custom behaviour. Finally, to combat the "actually going inside and adding logic to the original function", you can think of this in terms of functional programming perhaps. But you can use decorators to compose new functions, where they may share the same core functionality but you may not want to write the new functions in source code (perhaps there are many permutations), and instead build them dynamically.

can you please provide normal code that works? Instead of this NONE explanation in video :-/

@@magneat Hope this helps...I don't know how RU-vid will format this, so format accordingly :) #!/usr/bin/env python3 def check(func): def inside(a, b): if b == 0: print("Can't divide by 0") return return func(a, b) return inside @check def div(a, b): return a / b print(div(10, 0)) The major take away is that it is supposed to be "return func(a, b)", not "func(a, b)

classicrockonly yeah, thank you. Though I figured it out myself already. And didn’t you forget to put ELSE there?

@@magneat Nahh it's not necessary. If it's true it will return and ignore the rest of the inner function. So the else is implicit

classicrockonly btw, just today saw tutorial which said that putting single RETURN is “returning None implicitly”, which is considered a bad practice. And that Indian developers are doin this often in their code. “explicit is better than implicit” is named a better practice, like more correct way.

Exactly....

@@bsmaheshkumar5328 and the title is decorators made easy

That's not a question, that's a statement.

in 'def check(func)" func is just a local name, it could be anythong, if you call this div then in line 7 you would need to change code from func to div

The concept is pretty clear (imo); I don't see much added value in persnickety requests; I mean, other visitors aren't complaninig at all, that makes me think that the guy accomplished his goal (sharing knowledge) and helped me with mine (understand the basics of how decorators work)... and probably, others' too.

Line 7 should be "return func(a,b)", otherwise "inside" always returns "None".

"None" is the default value returned by python when nothing else gets returned.