The emulation code for the ./Systems/{id}/ResetAction resource in located in the file ./api_emulator/redfish/ComputerSystem/ResetAction.py. A behavior of a reset action is to change the ComputerSystem.Status.State property. However, this requires the code import a module within the ComputerSystem.py code in the parent directory. Python 3.3 removed relative imports, so imports from a parent directory requires hacking PYTHONPATH or adding the parent-path to sys.path.
There is a request for a cleaner way.