如何使用Serde::yaml遍历rust中的Yaml？

[dependencies]
serde = "1.0"
serde_yaml = "0.8"

use serde_yaml::{Value, Mapping, Sequence};

let yaml_str = r#"
    name: John
    age: 30
    hobbies:
        - reading
        - hiking
"#;

let value: Value = serde_yaml::from_str(yaml_str).unwrap();

if let Value::Mapping(mapping) = value {
    for (key, value) in mapping.iter() {
        // 处理键值对
        println!("Key: {}", key);
        println!("Value: {:?}", value);
    }
}

if let Value::Sequence(sequence) = value {
    for item in sequence.iter() {
        // 处理数组元素
        println!("Item: {:?}", item);
    }
}