[Tutor] Help me understand this tkinter related code
alan.gauld at btinternet.com
Fri Feb 26 21:22:17 CET 2010
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"Robert DeLaurentis" <lists at bobdel.com> wrote
> The local function change_volume(v) requires the argument v to operate
> but I'm unclear where the value of that argument is being set or why the
> code fails
> without it.
> def change_volume(v):
> volume_scale = Scale(app,
> variable = volume,
> from_ = 0.0,
> to = 1.0,
> resolution = 0.1,
> command = change_volume,
> label = "Volume",
> orient = HORIZONTAL)
I'm not familiar with the wodget in question but it looks like the command
expects to pass a parameter to the callback function. Therefore the
to provide a placeholder even though it doesn't use it!
You would need to find the documentation for the widget to confirm that
A Google seartch threw up this:
Which seems to confirm my theory :-)
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