python实现屏保计时器的示例代码

import turtle, time
def drawGap():
  turtle.penup()
  turtle.fd(5)
def drawLine(draw):
  drawGap()
  turtle.pendown() if draw else turtle.penup()
  turtle.fd(40)
  drawGap()
  turtle.right(90)
def drawDigit(d):
  drawLine(True) if d in [2,3,4,5,6,8,9] else drawLine(False) #g
  drawLine(True) if d in [0,1, 3, 4, 5, 6,7, 8, 9] else drawLine(False) #c
  drawLine(True) if d in [0, 2, 3, 5, 6, 8, 9] else drawLine(False) #d
  drawLine(True) if d in [0,2,6,8] else drawLine(False) #e
  turtle.left(90) #经历一次右转后，调整左转，方向竖直向上
  drawLine(True) if d in [0,4,5,6,8,9] else drawLine(False) 
  drawLine(True) if d in [0,2,3,5,6,7,8,9] else drawLine(False)
  drawLine(True) if d in [0,1,2,3,4,7,8,9] else drawLine(False)
  turtle.left(180)
  turtle.penup()
  turtle.fd(20)
def drawDate(date):
  turtle.pencolor('red')
  for i in date:
    if i == '-':
      turtle.write('时',font=('Arial',18,'normal'))
      turtle.pencolor('green')
      turtle.fd(40)
    elif i == '=':
      turtle.write('分', font=('Arial', 18, 'normal'))
      turtle.pencolor('blue')
      turtle.fd(40)
    elif i == '+':
      turtle.write('秒', font=('Arial', 18, 'normal'))
      turtle.pencolor('yellow')
    else:
      drawDigit(eval(i))
def init():
  turtle.setup(1920,1080,0,0) #设置画布大小 200 200 为屏幕位置
  turtle.speed(10)
  turtle.penup() 
  turtle.goto(0,0)
  turtle.fd(-350)
  turtle.pensize(5)
def main():
  while True:
    turtle.clear()
    init()
    time_string = time.strftime("%H-%M=%S+", time.localtime())
    turtle.getscreen().tracer(30,0)
    drawDate(time_string) #格式化时间 2017-05=02+ 控制输入年日月
    time.sleep(1)
    turtle.hideturtle()

main()