<p>发布python代码时,请小心确保缩进是正确的</p>
<p>打印0的原因是因为这是执行<code>print counteraway.ca.get()</code>时变量的值。如果您在一个函数中打印了该值,该函数在通过按钮更新该值时再次调用,则该函数将正确打印</p>
<p>例如,如果将<code>_update_counter</code>函数更改为:</p>
<pre><code>def _update_counter(self):
self.ca.set(str(self.countera))
print self.ca.get()
</code></pre>
<p>每次单击按钮更新值时,您都会看到它打印出正确的值</p>
<p>固定缩进后,完整代码如下所示:</p>
<pre><code>from Tkinter import *
class CounterAway(Frame):
def __init__(self, parent=None, **kw):
Frame.__init__(self, parent, kw)
self.countera = 0
self.ca = StringVar()
self._update_counter()
def _update_counter(self):
self.ca.set(str(self.countera))
print self.ca.get()
def count_up(self):
self.countera += 1
if self.countera > 99 : self.countera = 0
self._update_counter()
def count_down(self):
self.countera -= 1
if self.countera < 0 : self.countera = 0
self._update_counter()
def main():
root = Tk()
w, h = root.winfo_screenwidth(), root.winfo_screenheight()
"""root.geometry("%dx%d+0+0" % (w, h))"""
root.geometry('1000x1000')
counteraway = CounterAway(root)
Button(root, font=('Arial',30), width=10, text='Away +', command=counteraway.count_up).place(x=450, y=300)
Button(root, font=('Arial',30), width=10, text='Away -', command=counteraway.count_down).place(x=450, y=370)
Button(root, width=10, font=('Arial',30), text='Quit', command=root.destroy).place(x=10, y=10)
counteraway_label = Label(root, font="Arial 100 bold", fg="RED", textvariable=counteraway.ca).pack()
root.mainloop()
if __name__ == '__main__':
main()
</code></pre>