This Decorators in Python-Complete Tutorial is made for you. At the end of this tutorial, you will have full knowledge of the Decorators in Python.
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Part 18- Decorators in Python-Complete Tutorial
In this article of Python Tutorial, you will learn following-
- What is a Decorator in Python?
- How to Create a Decorator in Python?
- Use of Decorator in Python.
What is a Decorator in Python?
A Decorator extends the behavior of the function. A decorator allows implementing new features to an existing function without modifying the function itself. You can call the decorator before the function in which you wanna decorate.
For example-
@class_method
def commons(cls):
Here, @class_method is a decorator. It extends the behavior of the function and it describes the function behavior.
How to Create a Decorator in Python?
A Decorator is itself a function. You can create your own decorator, so for creating own decorator, let’s see in the example below-
Before defining any decorator, use the “@” operator.
Syntax of Decorator-
@decorator_name
def function_name
#function body
Call decorator before any function, in which you wanna use a decorator.
Example-
def cough_dec(func):
def func_wrapper():
print("cough") #code before function
func()
print("cough") #code after function
return func_wrapper
@cough_dec
def question():
print("can you give discount?")
@cough_dec
def answer():
print("it's only 50")
question()
answer()
OUTPUT-
*cough*
can you give discount?
*cough*
*cough*
it's only 50
*cough*
Here, “def func_wrapper()” is a wrapper function, which is defining the decorator. “return func_wrapper” is returning wrapper function. “@cough_dec” is a decorator.
To create your own decorator, you can create it as a function like in the example “def cough_dec(func)“. And inside that function, create a wrapper function like “def func_wrapper()”. Where you can define the behavior of a function.
After that, outside from wrapper function “def func_wrapper()”, return it as “return func_wrapper”. So, by doing this you can create your own decorator and then you can use this decorator many time, whenever you want.
Use of Decorator in Python–
Decorators are used in –
- Logging,
- Run time check,
- Synchronization,
- Type checking,
- Debugging,
- In web framework and many more.
That’s all for the Decorator in Python. I hope now you have a better understanding of the Decorator in Python.
Congratulations! You successfully learned the Decorator in Python.
In the next tutorial, we will start learning Reading & Writing files in Python.
Till then, Enjoy Learning Python!
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Though of the Day…
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– Mahatma Gandhi