Question

所以我正在使用python 3中的rubics cube计时器（使用tkinter）。

我试图让它按下空格时，计时器停止（最初我试图这样做开始和停止，但我发现它太难了）我试图将空格键绑定到我的Stop函数但它返回一个错误（当我在命名要绑定的函数后省略一组括号时，它出于某些愚蠢的原因认为我传递了2个参数.idk为什么这个发生）或根本不起作用。这是我的代码，Thx提前为解决方案。

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

你非常接近。

首先，bind函数需要函数本身作为参数。由于最后有()，因此您传递的是运行函数的结果，在本例中为None。离开那些：

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

其次，bind调用的函数必须接受事件参数。所以你需要像这样定义它：

def Stop(self, event=None):

绑定不工作tkinter python3

1 个答案: