What are Python decorators and how do they work?

What are Python decorators and how do they work?

Python decorators are a way to modify or enhance functions or methods without changing their code. They are often used for logging, access control, and instrumentation.

Can you give me an example of a simple decorator?

Sure! Here's a simple decorator that prints 'Hello' before calling the function:

def hello_decorator(func):
    def wrapper():
        print('Hello')
        func()
    return wrapper

@hello_decorator
def say_hello():
    print('Function is called!')

say_hello()  # This will print 'Hello' followed by 'Function is called!'

What happens if I want to pass arguments to the decorated function?

You can modify the wrapper function to accept arguments and pass them to the original function. Here's an example:

def arg_decorator(func):
    def wrapper(*args, **kwargs):
        print('Arguments:', args, kwargs)
        return func(*args, **kwargs)
    return wrapper

@arg_decorator
def greet(name):
    print(f'Hello, {name}!')

greet('Alice')  # This will print the arguments and then 'Hello, Alice!'