What is a decorator in Python?

A decorator is a function that takes another function, adds some extra behaviour to it, and returns the new function. You apply it by writing @decorator_name above the function, and the original code stays unchanged.

def shout(func):
    def wrapper():
        result = func()
        return result.upper()
    return wrapper

@shout
def greet():
    return "hello"

print(greet())

Output:

Writing @shout above greet is the same as writing greet = shout(greet). Decorators are used for logging, timing, login checks and caching. Use functools.wraps inside real decorators to keep the original function name. Learn more in Python Decorators.

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