从具有多个父子节点的嵌套Json中获取特定数据

import json

def get_value_from_nested_json(json_obj, target_key):
    if isinstance(json_obj, dict):
        for key, value in json_obj.items():
            if key == target_key:
                return value
            elif isinstance(value, (dict, list)):
                result = get_value_from_nested_json(value, target_key)
                if result is not None:
                    return result
    elif isinstance(json_obj, list):
        for item in json_obj:
            result = get_value_from_nested_json(item, target_key)
            if result is not None:
                return result

    return None

# 示例JSON数据
json_data = '''
{
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "country": "USA"
  },
  "contacts": [
    {
      "type": "email",
      "value": "john@example.com"
    },
    {
      "type": "phone",
      "value": "555-1234"
    }
  ]
}
'''

# 将JSON数据解析为对象
parsed_json = json.loads(json_data)

# 获取特定数据
target_key = "city"
result = get_value_from_nested_json(parsed_json, target_key)

if result is not None:
    print(f"The value for key '{target_key}' is: {result}")
else:
    print(f"The key '{target_key}' was not found in the JSON.")