code: def get_nn_images(self, structure, n):
          
  
          return [e['image'] for e in self.get_nn_info(structure, n)]
docs: Get image location of all near neighbors of site with index n in
          structure.
  
          Args:
              structure (Structure): input structure.
              n (integer): index of site for which to determine the image
                  location of near neighbors.
          Returns:
              images (list of 3D integer array): image locations of
                  near neighbors.