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('my_func')


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


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