如何让我的幸运轮在处理过程中旋转缓慢(使用python)

import turtle

# 创建一个窗口
window = turtle.Screen()
window.title("幸运轮")
window.bgcolor("white")

# 创建一个画笔
pen = turtle.Turtle()
pen.speed(1)  # 设置画笔速度，值越小速度越慢

# 绘制幸运轮
pen.penup()
pen.goto(0, -200)
pen.pendown()
pen.circle(200)

# 设置幸运轮的扇形颜色
colors = ["red", "orange", "yellow", "green", "blue", "purple"]

# 使幸运轮缓慢旋转
angle = 0
while True:
    pen.color(colors[angle % len(colors)])
    pen.begin_fill()
    pen.circle(200, 60)
    pen.left(120)
    pen.circle(200, 60)
    pen.end_fill()
    pen.left(10)
    angle += 1

# 关闭窗口
window.mainloop()