Add extra command line parameters to Pytest - used in the autouse fixtures

• conftest

#import pytest
#
def pytest_addoption(parser):
    parser.addoption("--demo")
#
#@pytest.fixture
#def demo(request):
#    return request.config.getoption("--demo")

import pytest

@pytest.fixture(autouse = True, scope="module")
def module_demo(request):
    demo = request.config.getoption("--demo")
    print(f"Module {demo}")
    return demo


@pytest.fixture(autouse = True, scope="function")
def func_demo(request):
    demo = request.config.getoption("--demo")
    print(f"Func {demo}")
    return demo


def test_me():
    pass

def test_two():
    pass

pytest -s --demo Hello

Module Hello
Func Hello
Func Hello