Validating Entry in tkinter

[Peter Otten]

python at bdurham.com wrote:

> How would your examples work with text being inserted or deleted via the
> clipboard?
> 
> Is there anything special that would have to happen for changes to a
> widget's value as the result of one of these events?

I think it doesn't matter whether you type in text, or insert it with Ctrl+V 
or the middle mouse button. The validatecommand handler is always triggered.

I suspect achieving the same effect with Button/KeyPress handlers would 
require significantly more work.