Python中的[] -esque装饰器语法是什么意思？

def my_decorator(func):
    def wrapper(*args, **kwargs):
        print("Before function is called")
        result = func(*args, **kwargs)
        print("After function is called")
        return result

    return wrapper

@my_decorator
def my_function():
    print("Function is called")

my_function()

def my_decorator(func):
    def wrapper(*args, **kwargs):
        print("Before function is called")
        result = func(*args, **kwargs)
        print("After function is called")
        return result

    return wrapper

@my_decorator[]
def my_function():
    print("Function is called")

my_function()