Pylint complains about the member of an instance that is set in another file

For my tests I created a method in the init.py file that I include in a lot of tests. Besides the fact that it seems to work pylint shows that the instance of the test class has no member floor.

init.py

def create_floor(self):
    self.floor = Floor.objects.create(level=0)
    ...

test_something.py

def setUp(self):
    create_floor(self)
    self.building = Building.objects.create(floor=self.floor)
    ...