Hi,
Thus spoketh GKalman <kalma...@msn.com>
unto us on Sun, 17 Jul 2011 20:34:22 -0700 (PDT):
>
> The following code fragment works OK. Question: why?
> #======================================
> from Tkinter import *
> root=Tk()
>
> lbl=Label(root,text='1').pack()
>
> def doIt():
> lbl.config(bg="yellow")
>
> btn=Button(root,text="do", bg="cyan",command=doIt).pack()
>
> root.mainloop()
> #=======================================
> My question is: how is the instance lbl.config(...) recognized in the
> doIt callback fn when called from the main w/o an argument referencing
> lbl?
When I run this example and hit the button I get:
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1413, in __call__
return self.func(*args)
File "test6.py", line 8, in doIt
lbl.config(bg="yellow")
AttributeError: 'NoneType' object has no attribute 'config'
as one would expect.
Regards
Michael
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