def get_installed_pypackages():
    return {p.project_name.lower(): p for p in pkg_resources.working_set}
def test_strictly_between():
    """Greater than y and less than z."""
    p = are.strictly_between(2, 4)
    ps = [p(x) for x in range(1, 6)]
    assert ps == [False, False, True, False, False]