Getting a value out of a function

I'm trying to generate random title for an auction and then use it outside the function. Writing:

def generate_random_title(self):
    self._title_uuid1 = get_random_uuid(7)
    return self._title_uuid1

_title_uuid = generate_random_title()

I get an error:

TypeError: generate_random_title() takes exactly 1 argument (0 given)