// Make the variable p not show up in the inspector
// but be serialized.
@HideInInspector
var p = 5;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    [HideInInspector]
    public int p = 5;
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    [HideInInspector]
    public p as int = 5