如何在python中附加到现有的json数组

import json

# 从文件中读取JSON数据
with open('data.json', 'r') as file:
    data = json.load(file)

# 从字符串中读取JSON数据
data_str = '[{"name": "Alice", "age": 25}, {"name": "Bob", "age": 30}]'
data = json.loads(data_str)

# 添加单个元素到JSON数组
new_element = {"name": "Charlie", "age": 35}
data.append(new_element)

# 添加多个元素到JSON数组
new_elements = [{"name": "Dave", "age": 40}, {"name": "Eve", "age": 45}]
data.extend(new_elements)

# 保存到文件
with open('updated_data.json', 'w') as file:
    json.dump(data, file)

# 转换为字符串
updated_data_str = json.dumps(data)