使用python根据特定值过滤嵌套的json

{
    "name": "root",
    "children": [
        {
            "name": "child1",
            "value": 10,
            "children": [
                {"name": "grandchild1", "value": 5},
                {"name": "grandchild2", "value": 15}
            ]
        },
        {
            "name": "child2",
            "value": 20,
            "children": [
                {"name": "grandchild3", "value": 25},
                {"name": "grandchild4", "value": 30}
            ]
        }
    ]
}

import json

def filter_json(data, target_value):
    if isinstance(data, dict):
        if 'value' in data and data['value'] == target_value:
            return data
        for key, value in data.items():
            result = filter_json(value, target_value)
            if result:
                return result
    elif isinstance(data, list):
        for item in data:
            result = filter_json(item, target_value)
            if result:
                return result
    return None

# 示例数据
json_data = {
    "name": "root",
    "children": [
        {
            "name": "child1",
            "value": 10,
            "children": [
                {"name": "grandchild1", "value": 5},
                {"name": "grandchild2", "value": 15}
            ]
        },
        {
            "name": "child2",
            "value": 20,
            "children": [
                {"name": "grandchild3", "value": 25},
                {"name": "grandchild4", "value": 30}
            ]
        }
    ]
}

# 过滤目标值为15的节点
filtered_node = filter_json(json_data, 15)
print(json.dumps(filtered_node, indent=4))