how to make when 1 button is clicked it will run animation

Question

extends KinematicBody2D
export var spe = 150
var move1 = Vector2.ZERO

func _ready():
$AnimationTree.active = true

func physicsprocess(delta):
var move1 = Vector2.ZERO
if Input.isactionpressed("uileft"):
move1.x -= 1
move1.y = 0

if Input.is_action_pressed("ui_right"):
    move1.x += 1
    move1.y = 0 

if Input.is_action_pressed("ui_down"):
    move1.x = 0
    move1.y += 1

if Input.is_action_pressed("ui_up"):
    move1.x = 0
    move1.y -= 1

move1 = move1.normalized()

if move1 == Vector2.ZERO:
    $AnimationTree.get("parameters/playback").travel("Stay")

else:
    $AnimationTree.get("parameters/playback").travel("Move")
    $AnimationTree.set("parameters/Stay/blend_position",move1)
    $AnimationTree.set("parameters/Move/blend_position",move1)
    move_and_slide(move1 * spe  )

Answer 1

In another post I read somebody solved this by exchanging:

$AnimationTree.set("parameters/Stay/blend_position",move1)

By:

$AnimationTree["parameters/Stay/blend_position"]=move1

Idk why as it should be the same.