Python tkinter label 更新方法

网上看的两个例子关于tkinter界面更新的，简单易懂，分享一下。

例子_1：

代码_1：

from tkinter import tk, checkbutton, label
from tkinter import stringvar, intvar

root = 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()

例子_2：

代码_2：

from tkinter import *
import time


class 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 = false


class 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()

以上这篇python tkinter label 更新方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。