export_selected.js

const fs = require("fs");

const shuffle = (array) => {
  let currentIndex = array.length,
    randomIndex;

  // While there remain elements to shuffle...
  while (currentIndex != 0) {
    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex--;

    // And swap it with the current element.
    [array[currentIndex], array[randomIndex]] = [
      array[randomIndex],
      array[currentIndex],
    ];
  }

  return array;
};

const selectedIds = ['123', '456']

const oldImagePath = "./build/images/";
const oldMetadataPath = "./build/json/";

const newImagePath = "./export/images/";
const newMetadataPath = "./export/metadata/";

const main = async () => {
  const shuffled = shuffle(selectedIds);

  for (const [index, id] of shuffled.entries()) {
    const oldImage = `${oldImagePath}${id}.png`;
    const newImage = `${newImagePath}${index}.png`;

    const oldMetadataFile = await fs.readFileSync(`${oldMetadataPath}${id}.json`);
    const oldMetadata = JSON.parse(oldMetadataFile);
    const newMetadata = {
      name: `New name format #${index}`,
      description: 'New description',
      image: `ipfs://NewUriToReplace/${index}.png`,
      attributes: oldMetadata["attributes"],
    };

    await fs.writeFileSync(
      `${newMetadataPath}${index}`,
      JSON.stringify(newMetadata)
    );

    await fs.copyFileSync(oldImage, newImage);
    console.log(`Image ${oldImage} copied to ${newImage}`);
  }
};

main();

list_selected.py

import glob

files = glob.glob("./selected/*.png")

def get_id(file_name):
    return file_name.split('/')[-1].split('.')[0]

result = map(get_id, files)
print result