python 用turtle库绘制时钟

from turtle import *from datetime import *def Skip(step):    penup()    forward(step)    pendown()def mkHand(name, length):    #注册Turtle形状，建立表针Turtle    reset()    Skip(-length*0.1)    begin_poly()    forward(length*1.1)    end_poly()    handForm = get_poly()    register_shape(name, handForm)#通过上述代码得到了3个表针的对象def Init():    global secHand, minHand, hurHand, printer    mode("logo")# 重置Turtle指向北    #建立三个表针Turtle并初始化    mkHand("secHand", 125)    mkHand("minHand",  130)    mkHand("hurHand", 90)#建立3个表针初始化    secHand = Turtle()#Turtle是turtle模块中的一个类，这样将三个表针实例化    secHand.shape("secHand")#建立秒针对象，shape是Turtle类中的方法    minHand = Turtle()    minHand.shape("minHand")#分针对象    hurHand = Turtle()    hurHand.shape("hurHand")#时针对象    for hand in secHand, minHand, hurHand:        hand.shapesize(1, 1, 3)        hand.speed(0)#速度最快，设为其他数时，有一个变化过程。    #建立输出文字Turtle    printer = Turtle()#同样实例化，将输出文字为类的一个对象    printer.hideturtle()    printer.penup()def SetupClock(radius):    #建立表的外框    reset()    pensize(7)    for i in range(60):        Skip(radius)        if i % 5 == 0:            forward(20)            Skip(-radius-20)        else:            dot(5)            Skip(-radius)        right(6)def Week(t):        week = ["星期一", "星期二", "星期三",            "星期四", "星期五", "星期六", "星期日"]    return week[t.weekday()]def Date(t):    y = t.year    m = t.month    d = t.day    return "%s %d %d" % (y, m, d)def Tick():    #绘制表针的动态显示    t = datetime.today()    second = t.second + t.microsecond*0.000001    minute = t.minute + second/60.0    hour = t.hour + minute/60.0    secHand.setheading(6*second)#表针对象中的setheading方法接受参数，设置当前朝向角度    minHand.setheading(6*minute)    hurHand.setheading(30*hour)    tracer(False)      printer.forward(65)    printer.write(Week(t), align="center",                  font=("Courier", 14, "bold"))    printer.back(130)    printer.write(Date(t), align="center",                  font=("Courier", 14, "bold"))    printer.home()    tracer(True)    ontimer(Tick, 100)#100ms后继续调用tickdef main():    tracer(False)    Init()    SetupClock(160)    tracer(True)    Tick()    mainloop()if __name__ == "__main__":           main()