Creating a datepicker widget

If we want to let users input a date into our application, we might add a text entry that forces them to write a string with a valid date format. Another solution would be adding several numeric entries for the day, month, and year, but this would also require some validations.

Unlike other GUI frameworks, Tkinter does not include a class for this purpose; however, we can opt to apply our knowledge of themed widgets to build a Calendar widget.

Getting ready

In this recipe, we will explain a step-by-step implementation of a datepicker widget made with Ttk widgets and features:

This is a refactored version of http://svn.python.org/projects/sandbox/trunk/ttk-gsoc/samples/ttkcalendar.py and does not...