You are literally theeee best , now and only I can understand decorators ,I absolutely love your approach of explaining things slowly with pure logic .keep it up!!!!
I've been programming python for 3.5 years and for the time being I got away with never using decorator. Every time I saw someone use decorators it confused me so much. Thanks for explaining a concept that seemed so daunting and making it actually easy :) It's really helpful
Well try understanding properties and descriptors then. There's something called a descriptor protocol that is very related to how python works internally.
A decorator is a higher order function that utilizes the property of closures, and helps dynamically add functionality to a function without altering any of it's own functionality. Learnt this from the great youtuber Corey Schafer.
Good video. Very happy I need one clarification: @12.06 min, you mentioned 'I now have a new functionality for this function'. CAn you please tell me which line you are referring to or has the new fn def? Thank you
It didnt because `@duration_decorator` is wrapped in the `@duration` decorator due to decorator stacking. Hence what happens is that the `func` in `decorator` function actually invokes the wrapped `duration_decorator ` function. It is the `duration_decorator` function which wraps the `func` function that invokes `func` and thus it outputs `Function` to the terminal. The order of stacking decorators is important with regard to the wrapping. I hope this helps and sorry its coming one year later.
It would be great if you could make a video on the descriptor protocol. Much of how Python works behind the scenes is based on or has something to do with descriptors. I have tried to understand them from many sources but still have not.
how if let say i put it in button 1 = original function and in button 2 = decorated function. if i press button 1 the result will be decorated function that is supposed to be original function. does that mean i need to manually remove again the @decorator on top of the original function? because it will effect button 1 if i put @decorator on top of of the original function. newbie here and wanted to learn this confusing decorator 😅. i hope you get what i mean to say. i want it to be. if pres button 1 = original function which print only "original" and if i press 2 = decorated function which prints "start decorated" "original" "end decorated". Thanks. def decoratedfunc(func): def wrapper(): print('start decorated') originalfunc() print('end decorated') return wrapper @decoratedfunc def originalfunc(): print('original') button1 = originalfunc() button2 = originalfunc()
Thats a very good explanation about Decorators, but in the class example you forget to change the "self._x" in the __init__ method for "self.x" for avoid self reference.
Started off well and your explanation is good but the written example is bad and confusing. You should have not named everything func. It is just confusing. You should have named it something else or no one can understand what is the use case. I can delete half this code and func() will still print out the function output.
I want to obtain an operator / operator(func_in) = func_out func_in(x) func_out(y) def operator(func_in): code return func_out code [Now I need to define func_out with the argument y and in its body I must program a function F( y , func_in )]: def func_out( y ): return F( y , func_in ) Or in lambda calculus: operator = λfunc_in.(λy. F( y , func_in )) \-----------v-----------/ func_out
![Understanding classes and object-oriented programming [Python Tutorial]](http://i.ytimg.com/vi/_vr5faCXFo8/mqdefault.jpg)
The way you've explained this topic is truly impressive.
You are literally theeee best , now and only I can understand decorators ,I absolutely love your approach of explaining things slowly with pure logic .keep it up!!!!
The way you describe concepts it's soo easy too understand, really appreciate your works...
This is really a master piece . I never visualized the actual flow of decorator anywhere. Thank you very much.
Best explanation I ve come across ...
Underrated channel😭🤧
Thanks 🙌
Finally a good video on decorators
Very logically presented from a senior hobbyist.
For the first time in my life I got to understand decorators cuz of you sir. Thanks a lot
this is a really good tutorial. Its well explained and well thought out. Well done!! :)
Perfect Tutorial. Thanks
Once again, It's a great video on this channel.🎉❤
excellent lesson, very simple and easy to understand. Thank you so much
Dude, you are describing it so well and brilliant ...that it's really hard and difficult not to understand it 👍
great explanation
Pythontutor is a good help to follow this video
wow! that is a lot of tutorials in a month!
yeyyy new video
I've been programming python for 3.5 years and for the time being I got away with never using decorator. Every time I saw someone use decorators it confused me so much. Thanks for explaining a concept that seemed so daunting and making it actually easy :) It's really helpful
I See That I Have Bin Coding Now 1.8 Years Of My Life (Python), This Was Really Helpful.
same i've been programming for 3 years n i never used decorators
Well try understanding properties and descriptors then. There's something called a descriptor protocol that is very related to how python works internally.
Great...keep doing this...your explanation is really great.....u have cleared my OOPs concepts very clearly ❤️
Thank you for another great tutorial!
woow i always wondered how decorators can accept parameters, now i got it. i think even procedurally generated decorators are possible
Thanks great video.
very GOOD!
I went with Star Trek theme for decorators
def replicator(function):
def food(food_params):
print(" replicator() -> food() ")
function(food_params)
print(" food replicated ")
return food
@replicator
def mealtime(func_params):
print(func_params)
mealtime("sandwich")
Thanks 🤗
I didn't finish the last video yet, I can't keep up the pace 😫 😪
But thank you so much for this content ❤️
Can you make a video about async programming with asyncio/await syntax?
fantastic
A decorator is a higher order function that utilizes the property of closures, and helps dynamically add functionality to a function without altering any of it's own functionality. Learnt this from the great youtuber Corey Schafer.
Good video. Very happy
I need one clarification:
@12.06 min, you mentioned 'I now have a new functionality for this function'.
CAn you please tell me which line you are referring to or has the new fn def?
Thank you
18:31 why didn’t it print “Function” twice??? func() was called once in decorator and duration_decorator wrapper function.
Can somebody explain this.
It didnt because `@duration_decorator` is wrapped in the `@duration` decorator due to decorator stacking. Hence what happens is that the `func` in `decorator` function actually invokes the wrapped `duration_decorator ` function. It is the `duration_decorator` function which wraps the `func` function that invokes `func` and thus it outputs `Function` to the terminal. The order of stacking decorators is important with regard to the wrapping. I hope this helps and sorry its coming one year later.
It would be great if you could make a video on the descriptor protocol. Much of how Python works behind the scenes is based on or has something to do with descriptors. I have tried to understand them from many sources but still have not.
Nice explanation. but when I run the same code it gives a type error.. Nonetype error is not callable
i fixed it
Wow
how if let say i put it in button 1 = original function and in button 2 = decorated function.
if i press button 1 the result will be decorated function that is supposed to be original function. does that mean i need to manually remove again the @decorator on top of the original function? because it will effect button 1 if i put @decorator on top of of the original function. newbie here and wanted to learn this confusing decorator 😅. i hope you get what i mean to say.
i want it to be. if pres button 1 = original function which print only "original" and if i press 2 = decorated function which prints "start decorated" "original" "end decorated". Thanks.
def decoratedfunc(func):
def wrapper():
print('start decorated')
originalfunc()
print('end decorated')
return wrapper
@decoratedfunc
def originalfunc():
print('original')
button1 = originalfunc()
button2 = originalfunc()
15:42
if you can make the examples with numbers like, func1 func2, every where you write same name and we strugle to understand whch is what.
Absolute mind torture.
😂😂😂😂
Watch the video by Corey Schafer in his Python OOPS Playlist. That's how I got started with it all. Pretty simple concept once you get the hang of it.
@@pranavnyavanandi9710 you're right, with all respect to this guy but no one beats Corey.
Thats a very good explanation about Decorators, but in the class example you forget to change the "self._x" in the __init__ method for "self.x" for avoid self reference.
Started off well and your explanation is good but the written example is bad and confusing. You should have not named everything func. It is just confusing. You should have named it something else or no one can understand what is the use case. I can delete half this code and func() will still print out the function output.
I want to obtain an operator / operator(func_in) = func_out
func_in(x)
func_out(y)
def operator(func_in):
code
return func_out
code [Now I need to define func_out with the argument y and in its body I must program a function F( y , func_in )]:
def func_out( y ):
return F( y , func_in )
Or in lambda calculus:
operator = λfunc_in.(λy. F( y , func_in ))
\-----------v-----------/
func_out