如何使計時器在Python中實時計時？

Question

此代碼會在屏幕上顯示一個小秒錶。
我做了一些複製粘貼以獲得第二個計數器。
我試圖讓第二個計數器的計數時間比計數器的實時時間要慢。
像第一個櫃檯經過的每隔1分鐘一樣，第二個櫃檯經過15秒鐘。
我試過把* 0.25的地方，但沒有得到它。

from Tkinter import * 
import time 

class StopWatch(Frame): 
    """ Implements a stop watch frame widget. """                 
    def __init__(self, parent=None, **kw):   
     Frame.__init__(self, parent, kw) 
     self._start = 0.0   
     self._elapsedtime = 0.0 
     self._running = 0 
     self.timestr = StringVar()    
     self.makeWidgets() 
     self.makeWidgets2() 

    def makeWidgets(self):       
     """ Make the time label. """ 
     l = Label(self, textvariable=self.timestr) 
     self._setTime(self._elapsedtime) 
     l.pack(fill=X, expand=NO, pady=2, padx=2)      

    def makeWidgets2(self):       
     """ Make the time label. """ 
     l = Label(self, textvariable=self.timestr) 
     self._setTime(self._elapsedtime) 
     l.pack(fill=X, expand=NO, pady=2, padx=2)  

    def _update(self): 
     """ Update the label with elapsed time. """ 
     self._elapsedtime = time.time() - self._start 
     self._setTime(self._elapsedtime) 
     self._elapsedtime = (self._elapsedtime * 0.1) 
     self._timer = self.after(50, self._update) 


    def _setTime(self, elap): 
     """ Set the time string to Minutes:Seconds:Hundreths """ 
     minutes = int(elap/60) 
     seconds = int(elap - minutes*60.0) 
     hseconds = int((elap - minutes*60.0 - seconds)*100)     
     self.timestr.set('%02d:%02d:%02d' % (minutes, seconds, hseconds)) 

    def Start(self):              
     """ Start the stopwatch, ignore if running. """ 
     if not self._running: 
      ''' make self.start the time now - zero''' 
      self._start = time.time() - self._elapsedtime 
      self._update() 
      self._running = 1 

    def Stop(self):          
     """ Stop the stopwatch, ignore if stopped. """ 
     if self._running: 
      self.after_cancel(self._timer)    
      self._elapsedtime = time.time() - self._start  
      self._setTime(self._elapsedtime) 
      self._running = 0 

    def Reset(self):         
     """ Reset the stopwatch. """ 
     self._start = time.time()   
     self._elapsedtime = 0.0  
     self._setTime(self._elapsedtime) 


def main(): 
    root = Tk() 
    sw = StopWatch(root) 
    sw.pack(side=TOP) 

    Button(root, text='Start', command=sw.Start).pack(side=LEFT) 
    Button(root, text='Stop', command=sw.Stop).pack(side=LEFT) 
    Button(root, text='Reset', command=sw.Reset).pack(side=LEFT) 
    Button(root, text='Quit', command=root.quit).pack(side=LEFT) 

    root.mainloop() 

if __name__ == '__main__': 
    main() 

Answer 1

你需要兩個必須分開時間字符串和分別更新它們。例如，在你的__init__功能，您可以定義：

​​

，然後你可以在開始 seperately更新他們，同時也通過縮放時的速度參數：

self._update(self.timestr, 1.0) 
self._update(self.timestr2, 0.5) 

這裏是一個完整的工作示例：

from Tkinter import * 
import time 

class StopWatch(Frame): 
    """ Implements a stop watch frame widget. """ 
    def __init__(self, parent=None, **kw): 
     Frame.__init__(self, parent, kw) 
     self._start = 0.0 
     self._elapsedtime = 0.0 
     self._running = 0 
     self.timestr = StringVar() 
     self.timestr2 = StringVar() 
     self.makeWidgets() 
     self.makeWidgets2() 

    def makeWidgets(self): 
     """ Make the time label. """ 
     l = Label(self, textvariable=self.timestr) 
     self._setTime(self._elapsedtime, self.timestr) 
     l.pack(fill=X, expand=NO, pady=2, padx=2) 

    def makeWidgets2(self): 
     """ Make the time label. """ 
     l = Label(self, textvariable=self.timestr2) 
     self._setTime(self._elapsedtime, self.timestr2) 
     l.pack(fill=X, expand=NO, pady=2, padx=2) 

    def _update(self, string_obj, rate): 
     """ Update the label with elapsed time. """ 
     self._elapsedtime = time.time() - self._start 
     self._setTime(self._elapsedtime*rate, string_obj) 
     self._timer = self.after(50, self._update, string_obj, rate) 


    def _setTime(self, elap, string_obj): 
     """ Set the time string to Minutes:Seconds:Hundreths """ 
     minutes = int(elap/60) 
     seconds = int(elap - minutes*60.0) 
     hseconds = int((elap - minutes*60.0 - seconds)*100) 
     string_obj.set('%02d:%02d:%02d' % (minutes, seconds, hseconds)) 

    def Start(self): 
     """ Start the stopwatch, ignore if running. """ 
     if not self._running: 
      ''' make self.start the time now - zero''' 
      self._start = time.time() - self._elapsedtime 
      self._update(self.timestr, 1.0) 
      self._update(self.timestr2, 0.5) 
      self._running = 1 

    def Stop(self): 
     """ Stop the stopwatch, ignore if stopped. """ 
     if self._running: 
      self.after_cancel(self._timer) 
      self._elapsedtime = time.time() - self._start 
      self._setTime(self._elapsedtime) 
      self._running = 0 

    def Reset(self): 
     """ Reset the stopwatch. """ 
     self._start = time.time() 
     self._elapsedtime = 0.0 
     self._setTime(self._elapsedtime) 


def main(): 
    root = Tk() 
    sw = StopWatch(root) 
    sw.pack(side=TOP) 

    Button(root, text='Start', command=sw.Start).pack(side=LEFT) 
    Button(root, text='Stop', command=sw.Stop).pack(side=LEFT) 
    Button(root, text='Reset', command=sw.Reset).pack(side=LEFT) 
    Button(root, text='Quit', command=root.quit).pack(side=LEFT) 

    root.mainloop() 

if __name__ == '__main__': 
    main()