Embedded Python - Githubissues

Embedding the Python interpreter in SIMPL allows for filters written in Python to be used from PipelineRunner and the DREAM3D GUI.

Adds the CMake option SIMPL_EMBED_PYTHON which is dependent on SIMPL_ENABLE_PYTHON
Checks the Python folder next to the application and SIMPL_PYTHONPATH for filters to load (will be adjusted for cross platform path setups)
Python files must define a global variable filters which is a list of strings. Each string is the name of a class that will be loaded
Each Python filter must derive from the Filter base class
In order to use a Python filter in a FilterPipeline in Python, it must be wrapped with PythonFilter
If you are loading a pipeline from json in Python that contains a Python filter, that Python filter must be registered in the FilterManager
AbstractFilter now has a DataContainerArray property in Python
Additional functions required for filter development can be bound as needed (i.e. DataContainerArray::createNonPrereqArrayFromPath)
When calling Python filters in C++ the GIL must be held/released appropriately especially in multi-threaded environments
PYTHONHOME is required to be set so Python can find its standard library
Python filters are hot re-loadable though any existing filters should be deleted before this

BlueQuartzSoftware / SIMPL