Python-like rust json/dictionary

gistfile1.rs

use serde_json::{Map, Value};

fn main()
{
    let mut map  = Map::new();
    let mut map2 = Map::new();
    
    // assuming keys_vals is a Vec<(String, String)>
    map.insert("key1".to_string(), Value::String("val".to_string()));
    map.insert("key2".to_string(), Value::String("val2".to_string()));
    map.insert("key3".to_string(), Value::String("val3".to_string()));
    map.insert("key4".to_string(), Value::Object(map2));
    
    let obj = Value::Object(map);    
    println!("{}",obj)
}