Tkinter/Pmw callback question
Fredrik Lundh
fredrik at pythonware.com
Sun Feb 25 17:40:15 EST 2001
David Lees write:
> RunButton = Tkinter.Button(root, text = 'Run',command=foo)
>
> where foo has no arguments, but when I write:
>
> RunButton = Tkinter.Button(root, text = 'Run',command=barf('junk'))
>
> things do not work correctly. The 'barf' function seems to execute when
> the program starts up, but not when I click the Run button.
>
> What goes on here
in this statement:
print barf("junk")
do you find it strange that the barf function is actually called
before the result is printed?
> what is the correct way to do call backs?
def call_barf():
barf("junk")
RunButton = Tkinter.Button(root, text = 'Run',
command=call_barf)
or
RunButton = Tkinter.Button(root, text = 'Run',
command=lambda: barf("junk"))
Cheers /F
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