from tkinter import Tk, Checkbutton, Labelfrom tkinter import StringVar, IntVarroot = Tk()text = StringVar()text.set('old')status = IntVar()def change(): if status.get() == 1: # if clicked text.set('new') else: text.set('old')cb = Checkbutton(root, variable=status, command=change)lb = Label(root, textvariable=text)cb.pack()lb.pack()root.mainloop() from tkinter import *import timeclass StopWatch(Frame): '''实现一个秒表部件''' msec = 50 def __init__(self, parent=None, **kw): Frame.__init__(self, parent, kw) self._start = 0.0 self._elapsedtime = 0.0 self._running = False self.timestr = StringVar() self.makeWidgets() self.flag = True def makeWidgets(self): '''制作时间标签''' l = Label(self, textvariable = self.timestr) self._setTime(self._elapsedtime) l.pack(fill = X, expand = NO, pady = 2, padx = 2) def _update(self): self._elapsedtime = time.time() - self._start self._setTime(self._elapsedtime) self._timer = self.after(self.msec, self._update) def _setTime(self, elap): '''将时间格式改为 分：秒：百分秒''' minutes = int(elap/60) seconds = int(elap-minutes*60.0) hseconds = int((elap - minutes*60.0 - seconds) *100) self.timestr.set('%2d:%2d:%2d' %(minutes, seconds, hseconds)) def Start(self): if not self._running: self._start = time.time() - self._elapsedtime self._update() self._running = True def Stop(self): '''停止秒表''' if self._running: self.after_cancel(self._timer) self._elapsedtime = time.time() - self._start self._setTime(self._elapsedtime) self._running = False def Reset(self): '''重设秒表''' self._start = time.time() self._elapsedtime = 0.0 self._setTime(self._elapsedtime) def stopwatch(self): if self.flag == True: self.pack(side = TOP) Button(self, text = 'start', command = self.Start).pack(side = LEFT) Button(self, text = 'stop', command = self.Stop).pack(side = LEFT) Button(self, text = 'reset', command = self.Reset).pack(side = LEFT) Button(self, text = 'quit', command = self.quit).pack(side = LEFT) self.flag = Falseclass Watch(Frame): msec = 1000 def __init__(self, parent=None, **kw): Frame.__init__(self, parent, kw) self._running = False self.timestr1 = StringVar() self.timestr2 = StringVar() self.makeWidgets() self.flag = True def makeWidgets(self): l1 = Label(self, textvariable = self.timestr1) l2 = Label(self, textvariable = self.timestr2) l1.pack() l2.pack() def _update(self): self._settime() self.timer = self.after(self.msec, self._update) def _settime(self): today1 = str(time.strftime('%Y-%m-%d', time.localtime(time.time()))) time1 = str(time.strftime('%H:%M:%S', time.localtime(time.time()))) self.timestr1.set(today1) self.timestr2.set(time1) def start(self): self._update() self.pack(side = TOP)if __name__ == '__main__': def main(): root = Tk() root.geometry('250x150') frame1 = Frame(root) frame1.pack(side = BOTTOM) sw = StopWatch(root) stpwtch = Button(frame1, text = '秒表', command = sw.stopwatch) stpwtch.pack(side = RIGHT) mw = Watch(root) mywatch = Button(frame1, text = '时钟', command = mw.start) mywatch.pack(side = LEFT) root.mainloop() main() 
