Special

 I have been asked about how IntVar() works. Like StringVar(), only

for ints. The thing to notive here is that it involves a function call. The trace

method will trigger the updatewithoutthe user having to push any

buttons. All that needs to happen is that the value of the IntVar changes.

This special var has a set() method, which an ordinary variable doesn't have.

And thus a get() method as well. 

https://python-course.eu/tkinter/variable-classes-in-tkinter.php

https://www.plus2net.com/python/tkinter-IntVar.php

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Am currently, repopulating tkcal from an sqlite3 database. Albeit, one record

at a time. This CAN be done...