No, it is not impossible. In fact, it is a common practice to populate a spinner in a .kv file using a list in a .py file. Here's an example:
In your .py file, define a list:
fruits = ['apple', 'banana', 'orange']
In your .kv file, create a spinner and set its values to the list:
Spinner:
values: root.fruits
Make sure to prefix the list name with "root." to access it from the .kv file.
Asked: 2022-08-22 11:00:00 +0000
Seen: 11 times
Last updated: Apr 08 '22