Easily switch off preCICE

Oftentimes, you want to run a coupled code in single-physics mode, so without preCICE. For codes like OpenFOAM or FEniCS, we would handle this in the adapter. As the Python bindings are also used in codes without adapters (e.g. Nutils) and the codes don't need compiling (Python), it would be really great if there was a simple "switch off" mechanism.

Say

import precice
precice.turn_off()
...
interface = precice.Interface("Solid", "../precice-config.xml", 0, 1)
...
vertex_ids = interface.set_mesh_vertices(mesh_id, vertices)

Then all preCICE calls should be NOPs.
This prevents us from polluting compact codes with a lot of

if(precice_used):
   interface = precice.Interface("Solid", "../precice-config.xml", 0, 1)

Is there a standard Python way how to do this? If not, could we handle it in the Python bindings?

I don't think we need this feature for other bindings as there we have longer codes and/or adapters and we compile. Do you agree?

Iniziate ispezionando il modulo pubblico precice e il punto di ingresso Interface mostrato nell'esempio. Determinate in che modo uno stato turn_off influirebbe sulla costruzione di Interface e sulle chiamate successive, quindi verificate che tutte le chiamate a preCICE diventino no-op mentre il codice Python a singola fisica continua a funzionare normalmente.