What license should the final program be under if it uses the LGPL v.2.1 and GPL v.3 libraries?

Question

Python

What license should the final program be under if it uses the LGPL v.2.1 and GPL v.3 libraries?

The project uses libraries
- pyzabbix https://github.com/lukecyca/pyzabbix
LGPL 2.1 license

- PyQt5 pyqt.sourceforge.net/Docs/PyQt5/introduction.html#...
GPL 3.0 license

Answer 1

GPL v3 is a highly restrictive license that severely restricts not only your final license, but also other dependencies.
In your case it should be GPLv3. However, PyQt5 has a dual license, and if you buy a paid one, then you can close your code.