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There are 17 example files that are installed with EnergyPlus that show you how to do this.

(py38)julien@ExampleFiles$ cd /usr/local/EnergyPlus-9-4-0/ExampleFiles/
(py38)julien@ExampleFiles$ ls PythonPlugin*.idf  | wc -l
17
(py38)julien@ExampleFiles$ ls *.py | wc -l
17
(py38)julien@ExampleFiles$ ls PythonPlugin*
PythonPluginAirflowNetworkOpeningControlByHumidity.idf  PythonPluginLrgOff_GridStorageSmoothing.py
PythonPluginAirflowNetworkOpeningControlByHumidity.py   PythonPluginPlantLoopOverrideControl.idf
PythonPluginConstantVolumePurchasedAir.idf              PythonPluginPlantLoopOverrideControl.py
PythonPluginConstantVolumePurchasedAir.py               PythonPluginPlantOperation_largeOff.idf
PythonPluginCurveOverride_PackagedTerminalHeatPump.idf  PythonPluginPlantOperation_largeOff.py
PythonPluginCurveOverride_PackagedTerminalHeatPump.py   PythonPluginReplaceTraditionalManagers_LargeOffice.idf
PythonPluginCustomOutputVariable.idf                    PythonPluginReplaceTraditionalManagers_LargeOffice.py
PythonPluginCustomOutputVariable.py                     PythonPluginTestMathAndKill.idf
PythonPluginCustomSchedule.idf                          PythonPluginTestMathAndKill.py
PythonPluginCustomSchedule.py                           PythonPluginThermochromicWindow.idf
PythonPluginCustomTrendVariable.idf                     PythonPluginThermochromicWindow.py
PythonPluginCustomTrendVariable.py                      PythonPluginUserDefined5ZoneAirCooled.idf
PythonPluginDemandManager_LargeOffice.idf               PythonPluginUserDefined5ZoneAirCooled.py
PythonPluginDemandManager_LargeOffice.py                PythonPluginUserDefinedWindACAuto.idf
PythonPluginDiscreteAirSystemSizes.idf                  PythonPluginUserDefinedWindACAuto.py
PythonPluginDiscreteAirSystemSizes.py                   PythonPluginWindowShadeControl.idf
PythonPluginLrgOff_GridStorageSmoothing.idf             PythonPluginWindowShadeControl.py

There are 17 example files that are installed with EnergyPlus that show you how to do this.

(py38)julien@ExampleFiles$ cd /usr/local/EnergyPlus-9-4-0/ExampleFiles/
(py38)julien@ExampleFiles$ ls PythonPlugin*.idf  | wc -l
17
(py38)julien@ExampleFiles$ ls *.py | wc -l
17
(py38)julien@ExampleFiles$ ls PythonPlugin*
PythonPluginAirflowNetworkOpeningControlByHumidity.idf  PythonPluginLrgOff_GridStorageSmoothing.py
PythonPluginAirflowNetworkOpeningControlByHumidity.py   PythonPluginPlantLoopOverrideControl.idf
PythonPluginConstantVolumePurchasedAir.idf              PythonPluginPlantLoopOverrideControl.py
PythonPluginConstantVolumePurchasedAir.py               PythonPluginPlantOperation_largeOff.idf
PythonPluginCurveOverride_PackagedTerminalHeatPump.idf  PythonPluginPlantOperation_largeOff.py
PythonPluginCurveOverride_PackagedTerminalHeatPump.py   PythonPluginReplaceTraditionalManagers_LargeOffice.idf
PythonPluginCustomOutputVariable.idf                    PythonPluginReplaceTraditionalManagers_LargeOffice.py
PythonPluginCustomOutputVariable.py                     PythonPluginTestMathAndKill.idf
PythonPluginCustomSchedule.idf                          PythonPluginTestMathAndKill.py
PythonPluginCustomSchedule.py                           PythonPluginThermochromicWindow.idf
PythonPluginCustomTrendVariable.idf                     PythonPluginThermochromicWindow.py
PythonPluginCustomTrendVariable.py                      PythonPluginUserDefined5ZoneAirCooled.idf
PythonPluginDemandManager_LargeOffice.idf               PythonPluginUserDefined5ZoneAirCooled.py
PythonPluginDemandManager_LargeOffice.py                PythonPluginUserDefinedWindACAuto.idf
PythonPluginDiscreteAirSystemSizes.idf                  PythonPluginUserDefinedWindACAuto.py
PythonPluginDiscreteAirSystemSizes.py                   PythonPluginWindowShadeControl.idf
PythonPluginLrgOff_GridStorageSmoothing.idf             PythonPluginWindowShadeControl.py

It works out of the box too.

(py38)julien@~$ mkdir tmp && cd tmp
(py38)julien@tmp$ cp /usr/local/EnergyPlus-9-4-0/ExampleFiles/PythonPluginCustomSchedule.* .
(py38)julien@tmp$ ls
PythonPluginCustomSchedule.idf  PythonPluginCustomSchedule.py
(py38)julien@tmp$ cp /usr/local/EnergyPlus-9-4-0/WeatherData/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.epw .
(py38)julien@tmp$ energyplus --version
EnergyPlus, Version 9.4.0-998c4b761e
(py38)julien@tmp$ energyplus -w USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.epw -d out PythonPluginCustomSchedule.idf 
EnergyPlus Starting
EnergyPlus, Version 9.4.0-998c4b761e, YMD=2020.10.13 00:16
Initializing Response Factors
[...]
EnergyPlus Run Time=00hr 00min  1.25sec
EnergyPlus Completed Successfully.

There are 17 example files files that are installed with EnergyPlus that show you how to do this.

(py38)julien@ExampleFiles$ cd /usr/local/EnergyPlus-9-4-0/ExampleFiles/
(py38)julien@ExampleFiles$ ls PythonPlugin*.idf  | wc -l
17
(py38)julien@ExampleFiles$ ls *.py | wc -l
17
(py38)julien@ExampleFiles$ ls PythonPlugin*
PythonPluginAirflowNetworkOpeningControlByHumidity.idf  PythonPluginLrgOff_GridStorageSmoothing.py
PythonPluginAirflowNetworkOpeningControlByHumidity.py   PythonPluginPlantLoopOverrideControl.idf
PythonPluginConstantVolumePurchasedAir.idf              PythonPluginPlantLoopOverrideControl.py
PythonPluginConstantVolumePurchasedAir.py               PythonPluginPlantOperation_largeOff.idf
PythonPluginCurveOverride_PackagedTerminalHeatPump.idf  PythonPluginPlantOperation_largeOff.py
PythonPluginCurveOverride_PackagedTerminalHeatPump.py   PythonPluginReplaceTraditionalManagers_LargeOffice.idf
PythonPluginCustomOutputVariable.idf                    PythonPluginReplaceTraditionalManagers_LargeOffice.py
PythonPluginCustomOutputVariable.py                     PythonPluginTestMathAndKill.idf
PythonPluginCustomSchedule.idf                          PythonPluginTestMathAndKill.py
PythonPluginCustomSchedule.py                           PythonPluginThermochromicWindow.idf
PythonPluginCustomTrendVariable.idf                     PythonPluginThermochromicWindow.py
PythonPluginCustomTrendVariable.py                      PythonPluginUserDefined5ZoneAirCooled.idf
PythonPluginDemandManager_LargeOffice.idf               PythonPluginUserDefined5ZoneAirCooled.py
PythonPluginDemandManager_LargeOffice.py                PythonPluginUserDefinedWindACAuto.idf
PythonPluginDiscreteAirSystemSizes.idf                  PythonPluginUserDefinedWindACAuto.py
PythonPluginDiscreteAirSystemSizes.py                   PythonPluginWindowShadeControl.idf
PythonPluginLrgOff_GridStorageSmoothing.idf             PythonPluginWindowShadeControl.py

It works out of the box too.

(py38)julien@~$ mkdir tmp && cd tmp
(py38)julien@tmp$ cp /usr/local/EnergyPlus-9-4-0/ExampleFiles/PythonPluginCustomSchedule.* .
(py38)julien@tmp$ ls
PythonPluginCustomSchedule.idf  PythonPluginCustomSchedule.py
(py38)julien@tmp$ cp /usr/local/EnergyPlus-9-4-0/WeatherData/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.epw .
(py38)julien@tmp$ energyplus --version
EnergyPlus, Version 9.4.0-998c4b761e
(py38)julien@tmp$ energyplus -w USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.epw -d out PythonPluginCustomSchedule.idf 
EnergyPlus Starting
EnergyPlus, Version 9.4.0-998c4b761e, YMD=2020.10.13 00:16
Initializing Response Factors
[...]
EnergyPlus Run Time=00hr 00min  1.25sec
EnergyPlus Completed Successfully.
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