python - 应用程序没有属性“计数器”,两个功能试图协同工作
问题描述
我写了一个计数器,它的工作原理是其他功能无法识别的。我希望这个计数器可以在任何其他功能中工作。
def buttoncounter(self):
self.showthis = str([self.videofirstbutton.get(),
self.videosecondbutton.get(),
self.videothirdbutton.get(),
self.videofourthbutton.get(),
self.videofifthbutton.get(),
self.videosixthbutton.get(),
self.homevideofirstbutton.get(),
self.homevideosecondbutton.get(),
self.homevideothirdbutton.get(),
self.homevideofourthbutton.get(),
self.homevideofifthbutton.get(),
self.homevideosixthbutton.get(),
self.castingfirstbutton.get(),
self.castingsecondbutton.get(),
self.castingthirdbutton.get(),
self.castingfourthbutton.get(),
self.castingfifthbutton.get(),
self.castingsixthbutton.get()])
self.counter = print(self.showthis.count('1'))
def printbutton(self):
self.printbutton = Button(self.frame, text="Print Events " + str(self.counter), width=15, command=self.buttoncounter) #str(self.counter)
self.printbutton.pack( side = LEFT )
错误是:
line 211, in printbutton
self.printbutton = Button(self.frame, text="Print Events " + str(self.counter), width=15, command=self.buttoncounter) #str(self.counter)
AttributeError: 'App' object has no attribute 'counter'
我希望按钮的输出是“打印事件(myanswer)”,但它只是一起拒绝
解决方案
正如@Paul Rooney 在评论中解释的那样,坏线是self.counter = print(self.showthis.count('1'))
. 该print
函数将字符串作为输入,并将它们写入stdout。顺便说一句,在 Python 中,所有不返回任何内容的函数实际上都返回None
. 因此,如果您决定存储不返回任何内容的函数的输出,您将得到None
:
>>> result = print('I\'m headed for your screen!')
I'm headed for your screen!
>>> result is None
True