08. Function Decorators

Decorators allow you to modify or extend the behavior of functions without changing their code.

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A Simple Decorator

def decorator(func):
    def wrapper():
        print("Before function")
        func()
        print("After function")
    return wrapper

@decorator
def say_hello():
    print("Hello")

say_hello()

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Passing Arguments

def decorator(func):
    def wrapper(*args, **kwargs):
        print("Start")
        result = func(*args, **kwargs)
        print("End")
        return result
    return wrapper

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Practice Challenge

Write a decorator that logs the arguments and return value of a function.

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Wrap-Up

• Use @decorator syntax to apply a decorator.
• Decorators enable clean separation of concerns.