从python中的JSON文件中删除嵌套的json密钥

import json

with open('data.json', 'r') as file:
    data = json.load(file)

def delete_nested_key(obj, key):
    if isinstance(obj, dict):
        if key in obj:
            del obj[key]
        for k, v in obj.items():
            delete_nested_key(v, key)
    elif isinstance(obj, list):
        for item in obj:
            delete_nested_key(item, key)

delete_nested_key(data, 'nested_key')

with open('data_modified.json', 'w') as file:
    json.dump(data, file)