code: def symmetry_average(image, symmetry):
      
      img_sym = np.zeros_like(image)
      angle = 360./symmetry
      for i in range(symmetry):
          img_sym += rotateImage(image, angle*i)
      img_sym /= symmetry
      return img_sym
docs: symmetry averaged image
      :param image:
      :param symmetry:
      :return: