g0 = ImmutableGenerator(lambda: (_ for _ in range(5))) v1, g1 = next(g0) assert v1 == 0 v2, g2 = next(g1) assert v2 == 1 v3, g3 = next(g2) assert v3 == 2 # several ways to get next value again_v1 = g0.next_value assert again_v1 == 0 again_v1, _ = next(g0) assert again_v1 == 0 # nice chaining assert g0.next_generator.next_value == 1 assert g0.next_generator.next_generator.next_value == 2 assert g0.next_generator.next_generator.next_generator.next_value == 3