A couple of places to look at:

• E+ internal API tests: EnergyPlustst/EnergyPlus/apihttps://github.com/NREL/EnergyPlus/tree/develop/tst/EnergyPlus/api
• I have an example notebook: jmarrec/OpenStudio_to_EnergyPlusAPIhttps://github.com/jmarrec/OpenStudio_to_EnergyPlusAPI