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Hi Jonathan,

the simulation is controlled by the SimulationControl section as well.

  SimulationControl,
    Yes,                     !- Do Zone Sizing Calculation
    Yes,                     !- Do System Sizing Calculation
    No,                      !- Do Plant Sizing Calculation
    Yes,                     !- Run Simulation for Sizing Periods
    Yes,                     !- Run Simulation for Weather File Run Periods
    No,                      !- Do HVAC Sizing Simulation for Sizing Periods
    1;                       !- Maximum Number of HVAC Sizing Simulation Passes

There can be also multiple RunPeriods defined in the IDF file. Please check it.

We are using the PythonPlugin mode, specifying the run period start stop by regex changes of source idf file (before execution). It works. I am not much familiar with the Python library mode you are using.