🤔 Python decorators

What are they? How do you use them?

🧵 Let's find out 👇

1️⃣ Decorator is a function or a class that wraps another function or class modifying its behavior.

So how does that work?

The first thing to know is that everything in Python is an object - functions too
2️⃣ That means they can be passed to another function as an argument or returned from a function

Functions that take other functions as an argument are called higher-order functions
3️⃣ In Python, you can define a function inside other function - such functions are called inner functions
4️⃣ To create a decorator you just need to apply all of that together

log_enter_leave is a decorator.

my_function is the function.

To alter my_function's behavior we reassign it applying log_enter_leave decorator.
5️⃣ To simplify usage of decorators Python offers us syntactic sugar

A "pie-decorator" syntax using @

@decorator_name
6️⃣ The only problem here is that my_function now identify as the wrapper function

To solve that we just need to use wraps from functools
7️⃣ You can decorate classes too.

For example, you can dataclass decorator on your class to automatically generate its __init__ and __repr__ methods
8️⃣ You can also use a class as a decorator

Decorator class needs methods:
- __init__
- __call__ (it makes class callable)
9️⃣ For example, decorators are used for registering view functions to the Flask application
1️⃣0️⃣ Read more:

https://t.co/eBMh1Gv0xZ

https://t.co/2YdA2ZIQoV

https://t.co/Wb0jSjmzlc
1️⃣1️⃣ Script with all of the examples:

https://t.co/Tw1qrbN0nN

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A THREAD 👇

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There's a bunch of state management solutions for Angular, but https://t.co/RJwpn74Qev is by far my favorite.

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🌿𝑻𝒉𝒆 𝒔𝒕𝒐𝒓𝒚 𝒐𝒇 𝒂 𝑺𝒕𝒂𝒓 : 𝑫𝒉𝒓𝒖𝒗𝒂 & 𝑽𝒊𝒔𝒉𝒏𝒖

Once upon a time there was a Raja named Uttānapāda born of Svayambhuva Manu,1st man on earth.He had 2 beautiful wives - Suniti & Suruchi & two sons were born of them Dhruva & Uttama respectively.
#talesofkrishna https://t.co/E85MTPkF9W


Now Suniti was the daughter of a tribal chief while Suruchi was the daughter of a rich king. Hence Suruchi was always favored the most by Raja while Suniti was ignored. But while Suniti was gentle & kind hearted by nature Suruchi was venomous inside.
#KrishnaLeela


The story is of a time when ideally the eldest son of the king becomes the heir to the throne. Hence the sinhasan of the Raja belonged to Dhruva.This is why Suruchi who was the 2nd wife nourished poison in her heart for Dhruva as she knew her son will never get the throne.


One day when Dhruva was just 5 years old he went on to sit on his father's lap. Suruchi, the jealous queen, got enraged and shoved him away from Raja as she never wanted Raja to shower Dhruva with his fatherly affection.


Dhruva protested questioning his step mother "why can't i sit on my own father's lap?" A furious Suruchi berated him saying "only God can allow him that privilege. Go ask him"