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   "id": "1e6f3bc7-5852-445f-b3d8-c183457a2052",
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   "source": [
    "# 打开三个输入文件和输出文件\n",
    "with open('dna_4g.txt', 'r', encoding='utf-8') as f1, \\\n",
    "     open('eng_4g.txt', 'r', encoding='utf-8') as f2, \\\n",
    "     open('protein_4g.txt', 'r', encoding='utf-8') as f3, \\\n",
    "     open('dna_eng_protein_12g.txt', 'w', encoding='utf-8') as output:\n",
    "\n",
    "    # 使用迭代器读取行\n",
    "    iterators = [iter(f1), iter(f2), iter(f3)]\n",
    "\n",
    "    while True:\n",
    "        exhausted_count = 0\n",
    "        for it in iterators:\n",
    "            try:\n",
    "                # 从当前文件取一行\n",
    "                line = next(it).strip()\n",
    "                output.write(line + '\\n')\n",
    "            except StopIteration:\n",
    "                exhausted_count += 1\n",
    "\n",
    "        if exhausted_count == len(iterators):\n",
    "            break\n",
    "\n",
    "print(\"混合完成！新文件: dna_eng_protein_12g.txt\")"
   ]
  }
 ],
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