从yaml读取时显示空值

import yaml

# 读取yaml文件
with open('example.yaml') as file:
    data = yaml.load(file, Loader=yaml.FullLoader)

# 处理空值
if data['key'] is None:
    print("键'key'的值为空")

import org.yaml.snakeyaml.Yaml;

public class YamlExample {
    public static void main(String[] args) {
        // 读取yaml文件
        Yaml yaml = new Yaml();
        try (InputStream in = Files.newInputStream(Paths.get("example.yaml"))) {
            Map<String, Object> data = yaml.load(in);

            // 处理空值
            if (data.get("key") == null) {
                System.out.println("键'key'的值为空");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

const fs = require('fs');
const yaml = require('js-yaml');

// 读取yaml文件
const data = yaml.safeLoad(fs.readFileSync('example.yaml', 'utf8'));

// 处理空值
if (data['key'] === null) {
    console.log("键'key'的值为空");
}