如何按嵌套值对JSON文件进行排序？

import json

def sort_json(json_data, sort_key):
    if isinstance(json_data, dict):
        sorted_data = {}
        for key in sorted(json_data.keys()):
            sorted_data[key] = sort_json(json_data[key], sort_key)
        return sorted_data
    elif isinstance(json_data, list):
        return [sort_json(item, sort_key) for item in json_data]
    else:
        return json_data

# 读取JSON文件
with open('data.json', 'r') as file:
    json_content = json.load(file)

# 按嵌套值进行排序
sorted_json = sort_json(json_content, 'nested_key')

# 保存排序后的JSON文件
with open('sorted_data.json', 'w') as file:
    json.dump(sorted_json, file, indent=4)