@pytest.fixture
def disc_zero_angle(solid_disk):
    'Disc with no angle of inclination.'
    (mass, pos, vel) = solid_disk(N_part=1000)
    return (mass, pos, vel)
Disc with no angle of inclination.
@pytest.fixture
def disc_zero_angle(solid_disk):
    
    (mass, pos, vel) = solid_disk(N_part=1000)
    return (mass, pos, vel)