code: def _transform(self, *transforms):
          
          sequence = None
          for transform in transforms:
              if sequence:
                  sequence = Sequence(sequence, transform=transform)
              else:
                  sequence = Sequence(self, transform=transform)
          return sequence
docs: Copies the given Sequence and appends new transformation
          :param transform: transform to apply or list of transforms to apply
          :return: transformed sequence