# coding:utf-8

 from tkinter import *

 import math,time

 global List

 global i

 root = Tk()

 List = []

 root.title("a simple clock")

 #设置窗口是否可以变化长/宽

 root.resizable(1, 1)

 def points():

     for i in range(1,13):

         x = 200 + 130*math.sin(2*math.pi*i/12)

         y = 200 - 130*math.cos(2*math.pi*i/12)

         canvas.create_text(x,y,text=i)

 def createline(radius,line_width,rad):

     x = 200 + radius * math.sin(rad)

     y = 200 - radius * math.cos(rad)

     i = canvas.create_line(200, 200, x, y, width=line_width)

     List.append(i)

 canvas = Canvas(root, width=400, height=500, bd=0, highlightthickness=0)

 canvas.pack()

 #生成外圆

 canvas.create_oval(50, 50, 350, 350)

 #生成数字

 points()

 while 1:

     tm=time.localtime()

     #cur_time=time.asctime(tm)

     cur_time2 = time.strftime('%Y-%m-%d %X', time.localtime())

     t_hour=0

     if tm.tm_hour<=12:

         t_hour=tm.tm_hour

     else:

         t_hour=tm.tm_hour-12

     rad1=2*math.pi*(t_hour+tm.tm_min/60)/12

     rad2=2*math.pi*(tm.tm_min+tm.tm_sec/60)/60

     rad3=2*math.pi*tm.tm_sec/60

     createline(50,6,rad1)

     createline(90,3,rad2)

     createline(120,1,rad3)

     time_text=canvas.create_text(200,450,text=cur_time2)

     root.update()

     time.sleep(1)

     for item in List:

         canvas.delete(item)

     canvas.delete(time_text)

     #root.update()

 mainloop()