// Set the wrap mode of the walk animation to loop
animation["Walk"].wrapMode = WrapMode.Loop;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        animation["Walk"].wrapMode = WrapMode.Loop;
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        animation['Walk'].wrapMode = WrapMode.Loop