This content originally appeared on DEV Community and was authored by Srinivasulu Paranduru
Decorators are flexible way to modify or extend behavior of functions or methods, without changing their actual code.
- A decorator is essentially a function that takes another function as an argument and returns a new function with enhanced functionality.
- Decorators are often used in scenarios such as logging, authentication and memorization, allowing us to add additional functionality to existing functions or methods in a clean, reusable way.
Now you can easily add on extra functionality with a decorator
@some_decorator
def simple_func():
# Do Simple stuff
return something
- We will go through the steps of manually building out a decorator ourselves, to show what @operator is doing behind the scenes
def func():
return 1
print(func())
print(func)
Output
1
def hello():
return "Hello!"
print(hello()) # Hello!
print(hello) # <function hello at 0x000001CC0184FA00>
#Copy one function to another
greet = hello
print(greet()) #'Hello!'
print(hello())
# o/p: 'Hello!'
# Deleting function
del hello
print(hello())
=> It will throw error as function hello deleted already
print(greet())
# o/p: 'Hello!'
Examples:1
def hello(name='Raju')
print('The hello() function has been executed!')
def greet():
return '\t This is the greet() func inside hello!'
def welcome():
return '\t This is welcome() inside hello'
print(greet())
print(welcome())
print('This is the end of the hello function!')
Examples:2
def hello(name='Raju')
print('The hello() function has been executed!')
def greet():
return '\t This is the greet() func inside hello!'
def welcome():
return '\t This is welcome() inside hello'
if name == 'Raju':
return greet
else :
return welcome
my_new_func = hello('Raju')
#o/P:
print(my_new_func())
Example:3
def cool():
def super_cool():
return 'I am very cool!'
return super_cool
some_func=cool()
some_func
some_func()
Passing function as a parameter to function
Example:1
def hello():
return 'Hi Jose!'
def other(some_def_func):
print('Other code runs here!')
print(some_def_func())
# passing raw function not executable function as parameter
other(Hello)
Output : It will throw error
Example:2
def new_decorator(orginal_func):
def wrap_func():
print('Some extra code, before the original function')
original_func()
print('Some extra code, after the original function!')
return wrap_func
def func_needs_decorator():
print("I want to be decorated!!")
func_needs_decorator()
o/p:
decorated_func = new_decorator(func_needs_decorator)
decorated_func()
# decorator
@new_decorator
def func_needs_decorator():
print("I want to be decorated!!")
# check the output
def func_needs_decorator():
print("I want to be decorated!!")
# check the output
References to extend your decorators concepts
1.Decorators are used for web frameworks
3.Creating web pages in python using Django
This content originally appeared on DEV Community and was authored by Srinivasulu Paranduru
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" » Decorators in Python." Srinivasulu Paranduru | Sciencx - Friday October 17, 2025, https://www.scien.cx/2025/10/17/decorators-in-python-2/
HARVARDSrinivasulu Paranduru | Sciencx Friday October 17, 2025 » Decorators in Python., viewed ,<https://www.scien.cx/2025/10/17/decorators-in-python-2/>
VANCOUVERSrinivasulu Paranduru | Sciencx - » Decorators in Python. [Internet]. [Accessed ]. Available from: https://www.scien.cx/2025/10/17/decorators-in-python-2/
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