How to display the number of values ​​in the window on the button?

Question

Python

Good day!
Tell me, please, is it possible to display the number of values ​​in the database on the button. That is, to do something like notifications.
The task is as follows: upon expiration in the database, one value changes to another, then a check for this value begins and the number of such values ​​is counted. Then a number indicating the number of these values ​​should be displayed in the field of the button itself. If possible, please send a link with a tutorial.

Answer 1

You can add a value to list and then use len to display the number