here are some good resources focused on Python application development that will be useful.

1. Create GUI Application with Python and Qt6 by Martin Fitzpatrick.

2. Mastering GUI Programming with Python by Alan D. Moore.

3. Learning Python Application Development by Ninad Sathaye.

4. Core Python Application Programming by Wesley J. Chun.

5. Hands-On Enterprise Application Development with Python by Riaz Ahmed

Hope this will help.