Instantiate Blocks Horizontally with same gap

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1

Hi, just created first script. Why dont work always instantiate blocks with same gap.

extends CanvasGroup

var left_two = preload("res://scenes/left_two.tscn")
var left_three = preload("res://scenes/left_three.tscn")

var lastPos = Vector2(-32, 0)
var scaleLast = Vector2.ZERO
var scaleNew = Vector2.ZERO
var gap = 400
var block_size = 10
# Called when the node enters the scene tree for the first time.
func _ready() -> void:
    for i in block_size:
		var random_block = randi_range(0, 1)
		if random_block == 0:
			var newBlock = left_two.instantiate()
			scaleNew = newBlock.get_scale()
			newBlock.set_global_position(Vector2(lastPos.x + (scaleLast.x / 2) + gap + (scaleNew.x / 2), position.y))
			lastPos = newBlock.position
			scaleLast = newBlock.get_global_scale()
			add_child(newBlock)
			print("left two")
		if random_block == 1:
			var newBlock = left_three.instantiate()
			scaleNew = newBlock.get_scale()
			newBlock.set_global_position(Vector2(lastPos.x + (scaleLast.x / 2) + gap + (scaleNew.x / 2), position.y))
			lastPos = newBlock.position
			scaleLast = newBlock.get_global_scale()
			add_child(newBlock)
			print("left three")

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	pass