Multiple copies of a pytest fixture

My approach would probably to create a fixture which can generate your objects:

@pytest.fixture
def thing(request, db):
    class ThingFactory(object):
        def get(self):
            thing = MyModel.objects.create()
            request.addfinalizer(thing.delete)
            return thing
    return ThingFactory()

def test_thing(thing):
    thing1 = thing.get()
    thing2 = thing.get()

Obviously you can make .get() take an argument etc.

(PS: Also note there's no need for the lambda in the finalizer)