#44 Python Tutorial for Beginners | Decorators

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In this lecture we will learn:
– Properties of functions
– What are decorators in Python?
– How to add extra features to a function?
– Properties of Decorators
– How to define decorators in Python?

#1
– Functions are built to perform certain tasks.

Properties of functions:-
– We can also write a code for the function inside another function.
– We can assign a function to another function in python as a function is also an object.
– A function is an instance of the Object type.
– We can store the function in a variable.
– We can also pass the function as a parameter to another function.
– A function from a function can also be returned.

#2
– Decorators are used to add extra features to the existing functions.
– Decorators can change the behaviour of an existing function at the compile itself.

#3
Properties of Decorators:-
-The outer function is called the decorator, which takes the original function as an argument and returns a modified version of it.
– Decorator contains an outer function that also takes a function as an argument.
– Inside the outer function, there is another function that takes a number of parameters as per the logic as an argument.
– Inner function contains the code for the logic that must be contained in the previously defined normal function.
– Inner function returns the values as per the required code that can be equal to the number of arguments passes in an inner function.
– Outer function return an inner function.
– In the main code, we have to call the outer function of a decorator and pass the normal function as an argument.

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