Application.isPlaying

Description

Returns true when in any kind of player (Read Only).

Returns true in the Unity editor when in play mode.

	if (Application.isPlaying) {
	    print("In player or playmode");
	}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Example() {
        if (Application.isPlaying)
            print("In player or playmode");
        
    }
}

import UnityEngine
import System.Collections

public class ExampleClass(MonoBehaviour):

	def Example() as void:
		if Application.isPlaying:
			print('In player or playmode')