Turtle Name在单独的函数中定义变量后出错

我想创建一个乌龟游戏。当我在游戏中点击乌龟形状时,它应该给我+1分,这样我就可以计算分数了。但当我执行命令并点击乌龟形状时,它会给我一个名称错误,即 NameError: name 'score_turtle' is not defined 即使它是在上级命令中定义的。请帮我修一下。

import turtle
import random

screen = turtle.Screen()
screen.bgcolor("light blue")
FONT = ('Arial', 25, 'normal')
skor = 0
turtle_list = []


#score turtle


def score_turtle_setup():
    score_turtle = turtle.Turtle()
    score_turtle.hideturtle()
    score_turtle.penup()
    score_turtle.color("dark blue")
    top_screen = screen.window_height() / 2
    y = top_screen * 0.85
    score_turtle.setpos(-200,y)
    score_turtle.write(arg=f"SCORE: 0", move=False, align="center", font=FONT)

def make_turtle(x, y):
    point = turtle.Turtle()

    def handle_click(x, y):
        global skor
        skor += 1
        score_turtle.write(arg=f"SCORE: {skor}", move=False, align="center", font=FONT)

    point.onclick(handle_click)
    point.shape("turtle")
    point.penup()
    point.color("green")
    point.shapesize(1.5)
    point.goto(x * 12, y*12)
    turtle_list.append(point)


x_coordinats = [-20,-10,0,10,20]
y_coordinats = [20,10,0,-10]


def setup_turtles():
    for x in x_coordinats:
        for y in y_coordinats:
            make_turtle(x, y)

def hide_turtles():
    for point in turtle_list:
        point.hideturtle()

def show_turtles():
    random.choice(turtle_list).showturtle()

turtle.tracer(0)

score_turtle_setup()
setup_turtles()
hide_turtles()
show_turtles()

turtle.tracer(1)

turtle.mainloop()

我试着调用函数 score_turtle_setup 来自 handle_click 功能,但不起作用。