[Python] aggregate or split pytest fixtures

Two related pytest questions:

Split fixture into individual values


I have a fixture which is an iterable and which is tested in a certain test. This works. However, I also have a test which wants to test the individual values - I don't know how to do this.

For example, how can I write the student fixture such that it returns each of the elements of klass?

@pytest.fixture
def klass() -> list[str]:
return ['alice', 'bob', 'claire']

@pytest.fixture
def student(klass) -> str: # HERE IS THE QUESTION
#code that returns each student in the klass individually


def test_klass(klass): # ran once
assert len(klass) > 0

def test_student(student): # ran 3 times
assert isinstance(student, str)

Combine individual fixture values into single fixture


The inverse problem occurs if I want to specify the students and combine them into a klass (the same test functions apply as above):

@pytest.fixture(params = ['alice', 'bob', 'claire'])
def student(request) -> str:
return request.param

@pytest.fixture
def klass(student) -> list[str]: # HERE IS THE QUESTION
#code that returns the list with all values for student

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