What is the decorator pattern in Python?

What is the decorator pattern in Python?

The decorator pattern in Python is a design pattern that allows you to add new functionality to an existing object without modifying its structure.

Can you give me an example of how to implement a decorator?

Sure! Here's a simple example:

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()

What are some common use cases for decorators?

Common use cases include logging, access control, memoization, and enforcing preconditions on function arguments.

How do decorators work with classes?

Decorators can also be applied to class methods and properties, allowing you to modify their behavior similarly to functions.