如何使用python修改嵌套的JSON

import json

def update_json(json_data, key, new_value):
    if isinstance(json_data, dict):
        for k, v in json_data.items():
            if k == key:
                json_data[k] = new_value
            elif isinstance(v, (dict, list)):
                update_json(v, key, new_value)
    elif isinstance(json_data, list):
        for item in json_data:
            if isinstance(item, (dict, list)):
                update_json(item, key, new_value)

# 示例JSON数据
json_str = '''
{
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York"
    },
    "hobbies": ["reading", "coding", "gaming"]
}
'''

# 将JSON字符串解析为Python对象
data = json.loads(json_str)

# 修改嵌套的JSON
update_json(data, "city", "San Francisco")

# 将修改后的数据转换为JSON字符串
updated_json_str = json.dumps(data, indent=4)

print(updated_json_str)