Using python decorator with or without parentheses

Question

In Python, what is the difference between using the same decorator with and without parentheses?

For example:

Without parentheses:

@some         


        

Answer 1

Some actually working code where you use the arg inside decorator:

def someDecorator(arg=None):
    def decorator(func):
        def wrapper(*a, **ka):
            if not callable(arg):
                print (arg)
                return func(*a, **ka)
            else:
                return 'xxxxx'
        return wrapper

    if callable(arg):
        return decorator(arg) # return 'wrapper'
    else:
        return decorator # ... or 'decorator'

@someDecorator(arg=1)
def my_func():
    print('aaa')

@someDecorator
def my_func1():
    print('bbb')

if __name__ == "__main__":
    my_func()
    my_func1()

The output is:

1
aaa