PythonEngineManager Singleton class that other class can access and use for query loaded Python Engine info.

 EvaluationState Enum of possible python evaluation states.

 PythonEngine This abstract class is intended to act as a base class for different python engines. When you derive from this class to implement a new python engine, ensure all referenced assemblies from the assembly that contains your python engine type are loadable at runtime or Dynamo will not load your python engine type.