PyQt5 how to write logic in separate file?

Question

PyQt

How can I write the calculator logic in a separate file?

Here is the calculator code:
(Habr does not allow adding the code because it is too long)
https://github.com/xXLareMoonXx/pyqt-calc/tree/main

Answer 1

As an option:
Write logic to a file, import it into the main one.

Answer 2

At first, it’s enough to move the interface into a separate
module