If set to true, the audio source will automatically start playing on awake.

		@script RequireComponent(AudioSource)
		function Start() {
			if(!audio.playOnAwake) {
				audio.Play(); // Play the clip if it wasn't set to play on awake
		}
	}

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(AudioSource))]
public class Example : MonoBehaviour {
    void Start() {
        if (!audio.playOnAwake)
            audio.Play();
        
    }
}

import UnityEngine
import System.Collections

[RequireComponent(typeof(AudioSource))]
public class Example(MonoBehaviour):

	def Start() as void:
		if not audio.playOnAwake:
			audio.Play()