綁定不工作tkinter python3

Question

所以我正在python 3（使用tkinter）rubics立方體計時器。

我試圖讓這個當你按下空格鍵，定時器停止 （最初我試圖爲啓動和停止這樣做，但我發現它太難） 我試圖空格鍵綁定到我的停止函數，但它要麼返回一個錯誤（當我命名的函數綁定後省略一組圓括號，它爲一些愚蠢的理由認爲我傳遞2個參數。idk爲什麼發生這種情況）或根本不工作。 這裏是我的代碼，Thx提前爲解決方案。

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() 


    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 _update(self): 
     """ Update the label with elapsed time. """ 
     self._elapsedtime = time.time() - self._start 
     self._setTime(self._elapsedtime) 
     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:    
      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 
      print("fsddaewSDGNFHRAW") # a test to see if it works 

    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) 
    root.bind("<space>",sw.Stop()) # this is where i tried to bind 
    # if i did this: 
    #root.bind("<space>",sw.stop) it would say im passing 2 parameters instead of one (self) 
    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

你離得很近。

首先，bind函數需要函數本身作爲參數。由於最後有()，因此您將傳遞運行該函數的結果，在此例中爲None。請將它們關閉：

root.bind("<space>",sw.Stop) 

其次，bind調用的函數必須接受事件參數。所以你需要像這樣定義它：

def Stop(self, event=None):