What is a decorator

A decorator in Python is a design pattern that allows you to modify the behavior of a function or class. Decorators are often used to add functionality to existing code in a clean and readable manner without altering the original code structure.

One common use of decorators is for logging, access control, caching, and more, where you might want to wrap an existing function with additional behavior.

# Example of a simple decorator in Python

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()  # This will show the output from both the decorator and the function