In tcl/tk an Entry widget can be set to validate its contents with the validate
option. You have to give it a validatecommand (vcmd), which is a tcl script
that runs when some action triggers validation. Usually, the script would use
"percent substitutions" so the script would be something like {ValidInt %P}
where %P is the value of the widget should the proposed change occur.
Can one do something like this in tkinter? I've verified that with
e = Entry(master, validate = 'all', vcmd = validInt)
the validInt function is called, but it isn't passed any parameters. I can't
find that e has any attribute corresponding to the %P value above.
Is it not possible to do this in tkinter, or have I overlooked something?
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