How can I use custom decorators in Python?

How can I use custom decorators in Python?

Custom decorators in Python are functions that modify the behavior of another function. You can create one by defining a function that takes another function as an argument and returns a new function.

Can you give me an example of a simple custom 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()  # This will call the wrapper instead of say_hello directly.

What 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 how:

def my_decorator(func):
    def wrapper(*args, **kwargs):
        print('Before the function call.')
        result = func(*args, **kwargs)
        print('After the function call.')
        return result
    return wrapper