Tkinter Button widget

[Shankar Iyer (siyer]

Hi,

I have another Tkinter-related question. At the beginning of my program, a tkinter window is created with six buttons. Each of these buttons is assigned a function that should be executed only when the button is pressed. However, it seems that these functions are all executed once when the button widgets are first created. Why is this the case and how do I prevent this from happening?

Shankar

[Peter Otten]

Shankar Iyer (si***@Princeton.EDU) wrote:

I have another Tkinter-related question. At the beginning of my
program, a tkinter window is created with six buttons. Each of these
buttons is assigned a function that should be executed only when the
button is pressed. However, it seems that these functions are all
executed once when the button widgets are first created. Why is this
the case and how do I prevent this from happening?

Change your source code from

# wrong
button = Tkinter.Button(..., command=some_function(),...)

to

# correct
button = Tkinter.Button(..., command=some_function,...)

to pass the *function* to the widget instead of the *result* of a function
call. And, next time, remember to post some code alongside with your
question.

Peter

[Fuzzyman]

Peter Otten wrote:

Shankar Iyer (si***@Princeton.EDU) wrote:
[snip..]
Change your source code from

# wrong
button = Tkinter.Button(..., command=some_function(),...)

to

# correct
button = Tkinter.Button(..., command=some_function,...)

to pass the *function* to the widget instead of the *result* of a function
call. And, next time, remember to post some code alongside with your
question.

Nice spot of mind reading there ;-)
I remember getting bitten by this one a while ago....

Regards,
Fuzzy
Peter

[William Park]

Peter Otten <__*******@web.de> wrote:

Shankar Iyer (si***@Princeton.EDU) wrote:

I have another Tkinter-related question. At the beginning of my
program, a tkinter window is created with six buttons. Each of these
buttons is assigned a function that should be executed only when the
button is pressed. However, it seems that these functions are all
executed once when the button widgets are first created. Why is this
the case and how do I prevent this from happening?

Change your source code from

# wrong
button = Tkinter.Button(..., command=some_function(),...)

to

# correct
button = Tkinter.Button(..., command=some_function,...)

to pass the *function* to the widget instead of the *result* of a
function call. And, next time, remember to post some code alongside
with your question.

Hmm, maybe I should learn Tk + Python. Telepathetic powers of Python
programmers are amazing.

--
William Park <op**********@yahoo.ca>, Toronto, Canada
ThinFlash: Linux thin-client on USB key (flash) drive
http://home.eol.ca/~parkw/thinflash.html
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http://freshmeat.net/projects/bashdiff/