一种完全但不完全准确的方法，尽管可能不太准确：
FONT_SIZE = 16FONT = ('Times New Roman', FONT_SIZE)t.color('red')t.dot(2) # show target of where we want to center text, for debuggingt.color('black')t.sety(t.ycor() - FONT_SIZE/2)t.write(12, align='center', font=FONT)现在，让我们整体上解决您的程序。我看到的主要问题是它闪烁并且比必要的更为复杂。首先要做的是将乌龟切换到 徽标
模式，该模式将顺时针旋转成正角，顶部旋转0度（与时钟不同！）。
然后， 一旦 将表盘放在自己的乌龟上进行擦除并一遍又一遍地绘制， 就将 表盘图分割到自己的乌龟上进行绘制。我们都将
whileTrue:and抛弃
sleep()在事件驱动的世界（如turtle）中没有位置，而是使用turtle timer事件：
from datetime import datetimefrom turtle import Screen, TurtleOUTER_RADIUS = 150LARGE_TICK = 20SMALL_TICK = 10FONT_SIZE = 16FONT = ('Times New Roman', FONT_SIZE)def draw_dial(): dial = Turtle() dial.hideturtle() dial.dot() dial.up() dial.forward(OUTER_RADIUS) dial.right(90) dial.down() dial.circle(-OUTER_RADIUS) dial.up() dial.left(90) dial.backward(OUTER_RADIUS) for mark in range(60): distance = LARGE_TICK if mark % 5 == 0 else SMALL_TICK dial.forward(OUTER_RADIUS) dial.down() dial.backward(distance) dial.up() dial.backward(OUTER_RADIUS - distance) dial.right(6) dial.sety(-FONT_SIZE/2) dial.setheading(30) # starting at 1 o'clock for z in range(1, 13): dial.forward(OUTER_RADIUS - (LARGE_TICK + FONT_SIZE/2)) dial.write(z, align='center', font=FONT) dial.backward(OUTER_RADIUS - (LARGE_TICK + FONT_SIZE/2)) dial.right(30)def tick(): hour_hand = datetime.today().hour minute_hand = datetime.today().minute second_hand = datetime.today().second hands.reset() hands.hideturtle() # redo as undone by reset() hands.right(hour_hand * 30 + minute_hand / 60 * 30) hands.forward(1/3 * OUTER_RADIUS) hands.backward(1/3 * OUTER_RADIUS) hands.left(hour_hand * 30 + minute_hand / 60 * 30) hands.right(minute_hand * 6) hands.forward(2/3 * OUTER_RADIUS) hands.backward(2/3 * OUTER_RADIUS) hands.left(minute_hand * 6) hands.right(second_hand * 6) hands.forward(OUTER_RADIUS - (LARGE_TICK + FONT_SIZE)) hands.backward(OUTER_RADIUS - (LARGE_TICK + FONT_SIZE)) hands.left(second_hand * 6) screen.update() screen.ontimer(tick, 1000)screen = Screen()screen.mode('logo') # make 0 degrees straight up, positive angles clockwise (like a clock!)screen.tracer(False)draw_dial()hands = Turtle()tick()screen.mainloop()
