LBL logo

Buildings.Utilities.IO.Python27.Functions

Package with functions that call Python

Information

This package contains functions that call Python.

Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).

Package Content

Name Description
Buildings.Utilities.IO.Python27.Functions.exchange exchange Function that communicates with Python
Buildings.Utilities.IO.Python27.Functions.Examples Examples Collection of models that illustrate model use and test models
Buildings.Utilities.IO.Python27.Functions.BaseClasses BaseClasses Package with functions that call Python

Buildings.Utilities.IO.Python27.Functions.exchange

Function that communicates with Python

Information

This function is a wrapper for Buildings.Utilities.IO.Python27.Functions.BaseClasses.exchange. It adds the directory modelica://Buildings/Resources/Python-Sources to the environment variable PYTHONPATH prior to calling the function that exchanges data with Python. After the function call, the PYTHONPATH is set back to what it used to be when entering this function. See Buildings.Utilities.IO.Python27.UsersGuide for instructions, and Buildings.Utilities.IO.Python27.Functions.Examples for examples.

Inputs

TypeNameDefaultDescription
StringmoduleName Name of the python module that contains the function
StringfunctionNamemoduleNameName of the python function
RealdblWri[max(1, nDblWri)] Double values to write
IntegerintWri[max(1, nIntWri)] Integer values to write
StringstrWri[max(1, nStrWri)] String values to write
IntegernDblWri Number of double values to write
IntegernDblRea Number of double values to read
IntegernIntWri Number of integer values to write
IntegernIntRea Number of integer values to read
IntegernStrWri Number of strings to write

Outputs

TypeNameDescription
RealdblRea[max(1, nDblRea)]Double values returned by Python
IntegerintRea[max(1, nIntRea)]Integer values returned by Python

Modelica definition

function exchange "Function that communicates with Python" input String moduleName "Name of the python module that contains the function"; input String functionName=moduleName "Name of the python function"; input Real dblWri[max(1, nDblWri)] "Double values to write"; input Integer intWri[max(1, nIntWri)] "Integer values to write"; input String strWri[max(1, nStrWri)] "String values to write"; input Integer nDblWri(min=0) "Number of double values to write"; input Integer nDblRea(min=0) "Number of double values to read"; input Integer nIntWri(min=0) "Number of integer values to write"; input Integer nIntRea(min=0) "Number of integer values to read"; input Integer nStrWri(min=0) "Number of strings to write"; // input Integer nStrRea(min=0) "Number of strings to read"; // input Integer strLenRea(min=0) // "Maximum length of each string that is read. If exceeded, the simulation stops with an error"; output Real dblRea[max(1, nDblRea)] "Double values returned by Python"; output Integer intRea[max(1, nIntRea)] "Integer values returned by Python"; protected String pytPat "Value of PYTHONPATH environment variable"; String pytPatBuildings "PYTHONPATH of Buildings library"; Boolean havePytPat "true if PYTHONPATH is already set by the user"; //-- String filNam = "file://Utilities/IO/Python27/UsersGuide/package.mo" //-- "Name to a file of the Buildings library"; algorithm // Get the directory to Buildings/Resources/Python-Sources //-- The lines below do not work in Dymola 2014 due to an issue with the loadResource //-- (ticket #15168). This will be fixed in future versions. //-- pytPatBuildings := Buildings.BoundaryConditions.WeatherData.BaseClasses.getAbsolutePath(uri=filNam); //-- pytPatBuildings := Modelica.Utilities.Strings.replace( //-- string=pytPatBuildings, //-- searchString=filNam, //-- replaceString="Resources/Python-Sources"); // The next line is a temporary fix for the above problem pytPatBuildings := "Resources/Python-Sources"; // Update the PYTHONPATH variable (pytPat, havePytPat) :=Modelica.Utilities.System.getEnvironmentVariable("PYTHONPATH"); if havePytPat then Modelica.Utilities.System.setEnvironmentVariable(name="PYTHONPATH", content=pytPat + ":" + pytPatBuildings); else Modelica.Utilities.System.setEnvironmentVariable(name="PYTHONPATH", content=pytPatBuildings); end if; // Call the exchange function (dblRea, intRea) :=BaseClasses.exchange( moduleName=moduleName, functionName=functionName, dblWri=dblWri, intWri=intWri, strWri=strWri, nDblWri=nDblWri, nDblRea=nDblRea, nIntWri=nIntWri, nIntRea=nIntRea, nStrWri=nStrWri); // Change the PYTHONPATH back to what it was so that the function has no // side effects. if havePytPat then Modelica.Utilities.System.setEnvironmentVariable(name="PYTHONPATH", content=pytPat); else Modelica.Utilities.System.setEnvironmentVariable(name="PYTHONPATH", content=""); end if; end exchange;
http://simulationresearch.lbl.gov/modelica