Python Decorators Tutorial: how Python decorators work

This Python Decorators Tutorial video is about what are decorators in Python and how Python decorators work. The video is for absolute beginners with simple examples.

I started with creating a background for a Python decorator usage, and specified the problems that decorators solve.

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In this video reviewed three versions of Python decorators:
1. A simple decorator for a function that not accepting any arguments
2. A decorator for a function that accepting some arguments
3. A decorator that has own arguments for a function that accepting some arguments

And a small bonus:
- A small demo that list comprehensions are faster than a FOR loop for generating lists.

Python Decorators are possible because of Python functions are first class objects.
First class object means that:
- functions are real objects that even have own methods
- a function can be assigned as a value to variables
- a function can be sent to another function as an argument (like it happens with the map() function)
- we can return function objects as a returning value of another function
- inside a function we can define another... nested function.

Timecodes:
7:57 - the beginning of explanation.
12:35 - Python decorators for function with arguments
18:48 - Python decorators with arguments for function that have own argument

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This Python decorators tutorial is about how decorators work in Python.

Python Decorators Tutorial: how Python decorators work:

#python #pythontutorial #redeyedcoderclub

[RedEyedCoderClub]

What video should I make next? Any suggestions? *Write me in comments!*
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[EnglishRain]

9:20 - great clarification! I finally understand difference between myfunc & myfunc(). Subscribed!

[deneenb]

thank you very much for this sir. Can you post a video specifically about the @property decorator? I do not understand it and there seems to be very little people who explain it on here. thank you again

[petrockspiracy]

In response to the last part of the video where you talk about if the function AND the decorator take arguments:


What if I don't know the value of n before I've run the arguments through timeit? i.e. I want to do something with the argument passed to the decorator and then pass the result of that to the function when called in the wrapper.


Is that not possible?

[pandaparas]

Can we use decorator inside decorator, what its use case? This question was asked to me . How to respond this question