I need a way to generate a dictionary containing unique paths for every pytest module/file in a given directory. It needs to be accessible before any test is even run to define the paths for the file:

TEST_DIRS = {}

path1 = TEST_DIRS['path']
path2 = TEST_DIRS['input']

def test_something():
    target = path1 / 'input_file'
    ....
def test_another_thing():
    ....

Also there should be directory config file like conftest to perform the generating actions required by each module. Generator would create directories based on the test name.

I tried using conftest.py file and pytest_collection_modify_items but it still makes the TEST_DIRS work only inside test function not before them.

def pytest_collection_modifyitems(items):
    timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
    for item in items:
        module_name = item.module.__name__
        test_paths = {
            key: value.format(test_name=module_name, timestamp=timestamp)
            for key, value in BASE_TEST_DIRS.items()
        }
        test_paths = {
            key: home / Path(value)
            for key, value in test_paths.items()
        }
    
        for key, path in test_paths.items():
            if key.startswith('output'):
                if not os.path.exists(path):
                    os.makedirs(path)

        item.module.TEST_DIRS = test_paths