![]() ![]() The following table shows the substitution codes that you can use with the tuple: %d'Īction code: 0 for an attempted deletion, 1 for an attempted insertion, or -1 if the callback was called for focus in, focus out, or a change to the textvariable. It returns a string that you can use with the validatecommand. To get a reference to a Tck/tk function, you pass a callable to the widget.register() method. Zero or more substitution codes specify the information that triggers the event you want to pass into the function.The validatecommand is a tuple that contains: Please note that the string 'none' is not the Nonevalue in Python. Validate in all the above situations focusing, focusout, and key Validate whenever any keystroke changes the widget’s contents. Validate whenever the widget gets or loses focus The validate command can be one of the following string values: ![]() In other words, it’ll execute if the validatecommand returns False. ![]()
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