The playback speed of the animation. 1 is normal playback speed.

	// Walk backwards
	animation["Walk"].speed = -1.0;
	// Walk at double speed
	animation["Walk"].speed = 2;

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        animation["Walk"].speed = -1.0F;
        animation["Walk"].speed = 2;
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		animation['Walk'].speed = (-1.0F)
		animation['Walk'].speed = 2