// Toggle between Diffuse and Transparent/Diffuse shaders
    // when space key is pressed
    var shader1 : Shader = Shader.Find("Diffuse");
    var shader2 : Shader = Shader.Find("Transparent/Diffuse");
    function Update() {
        if (Input.GetButtonDown("Jump")) {
            if( renderer.material.shader == shader1 )
                renderer.material.shader = shader2;
            else
                renderer.material.shader = shader1;
        }
    }

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Shader shader1 = Shader.Find("Diffuse");
    public Shader shader2 = Shader.Find("Transparent/Diffuse");
    void Update() {
        if (Input.GetButtonDown("Jump"))
            if (renderer.material.shader == shader1)
                renderer.material.shader = shader2;
            else
                renderer.material.shader = shader1;
        
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public shader1 as Shader = Shader.Find('Diffuse')

    public shader2 as Shader = Shader.Find('Transparent/Diffuse')

    def Update():
        if Input.GetButtonDown('Jump'):
            if renderer.material.shader == shader1:
                renderer.material.shader = shader2
            else:
                renderer.material.shader = shader1