What is the best practice to use PyQt with non PyQt back-end code

[QtFranchise]

Hi, I am working on an application development where the UI part is to be coded using PyQt (front-end) and back-end should be coded using non PyQt coding (python). So before proceeding on the development I wanted to know the best practices.

I can list the options as below

1. Using Signal and Slot to connect PyQt and non PyQt (python)
2. Using flag and threads on non PyQt (threading.Thread) to continuously monitor and update certain flag and take action accordingly on PyQt using Qthreads
3. By importing the UI class object directly into the non PyQt (python) code, update the PyQt UI element.

So, which among these is the best.

[JonB]

@QtFranchise
I do not like either #2 or #3.

The best is #1. Depends which direction you want signals to be sent. You cannot emit signals in non-PyQt code; but I think you can actually connect() non-PyQt functions as slots without issue. Can't you write a "thin wrapper" with PyQt to allow signals/slots between your PyQt and non-PyQt code?

[QtFranchise]

@JonB
That sounds cool. Will follow your suggestion.