Python Decorators
Decorators allow you to modify the behavior of a function or class. They allow you to wrap another function in order to extend the behavior of the wrapped function, without permanently modifying it.
Syntax
Decorators are usually called before the definition of a function you want to decorate.
@my_decorator
def my_function():
passCreating a Decorator
A decorator is a function that takes another function and extends the behavior of the latter function without explicitly modifying it.
def my_decorator(func):
def wrapper():
print("Something is happening before the function is called.")
func()
print("Something is happening after the function is called.")
return wrapper
@my_decorator
def say_hello():
print("Hello!")
say_hello()Decorating Functions with Arguments
If the function being decorated takes arguments, the wrapper function needs to accept those arguments using *args and **kwargs.
def do_twice(func):
def wrapper_do_twice(*args, **kwargs):
func(*args, **kwargs)
func(*args, **kwargs)
return wrapper_do_twice
@do_twice
def greet(name):
print(f"Hello {name}")
greet("World")