Import and instantiate models as System member attributes.
Models defined in
models/__init__.pywill be instantiated sequentially as attributes with the same name as the class name. In addition, all models will be stored in dictionary
System.modelswith model names as keys and the corresponding instances as values.
system.Busstores the Bus object, and
system.GENCLSstores the classical generator object,
system.models['Bus']points the same instance as