// Detects if any key has been pressed.

function Update() {
if(Input.anyKey)
Debug.Log("A key or mouse click has been detected");
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Update() {
if (Input.anyKey)
Debug.Log("A key or mouse click has been detected");

}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Update():
if Input.anyKey:
Debug.Log('A key or mouse click has been detected')