// Create a rotation
var rotation = Quaternion.identity;
// Assign a rotation 30 degrees around the y axis
rotation.eulerAngles = Vector3(0, 30, 0);
// print the rotation around the y-axis
print(rotation.eulerAngles.y);

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Quaternion rotation = Quaternion.identity;
    void Example() {
        rotation.eulerAngles = new Vector3(0, 30, 0);
        print(rotation.eulerAngles.y);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public rotation as Quaternion = Quaternion.identity

    def Example():
        rotation.eulerAngles = Vector3(0, 30, 0)
        print(rotation.eulerAngles.y)