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
exchange	Function that communicates with Python
Examples	Collection of models that illustrate model use and test models
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

Type	Name	Default	Description
String	moduleName		Name of the python module that contains the function
String	functionName	moduleName	Name of the python function
PythonObject	pytObj		Memory that holds the Python object
Boolean	passPythonObject		Set to true if the Python function returns and receives an object, see User's Guide
Real	dblWri[max(1, nDblWri)]		Double values to write
Integer	intWri[max(1, nIntWri)]		Integer values to write
String	strWri[max(1, nStrWri)]		String values to write
Integer	nDblWri	nDblWri( ...	Number of double values to write
Integer	nDblRea	nDblRea( ...	Number of double values to read
Integer	nIntWri	nIntWri( ...	Number of integer values to write
Integer	nIntRea	nIntRea( ...	Number of integer values to read
Integer	nStrWri	nStrWri( ...	Number of strings to write

Outputs

Type	Name	Description
Real	dblRea[max(1, nDblRea)]	Double values returned by Python
Integer	intRea[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 BaseClasses.PythonObject pytObj "Memory that holds the Python object"; input Boolean passPythonObject "Set to true if the Python function returns and receives an object, see User's Guide"; 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 pytPatOld "Old value of PYTHONPATH environment variable"; String pytPatBuildings "PYTHONPATH of Buildings library"; String pytPat "Value of PYTHONPATH environment variable"; Boolean havePytPat "true if PYTHONPATH is already set by the user"; package P constant String filNam = "modelica://Buildings/legal.html" "Name to a file of the Buildings library"; constant String buiLibFil = Modelica.Utilities.Files.loadResource(uri=filNam) "Absolute path to filNam"; end P; String searchString = "legal.html" "String to be replaced"; algorithm // Get the directory to Buildings/Resources/Python-Sources pytPatBuildings := Modelica.Utilities.Strings.replace( string=P.buiLibFil, searchString=searchString, replaceString="Resources/Python-Sources"); // Update the PYTHONPATH variable (pytPatOld, havePytPat) :=Modelica.Utilities.System.getEnvironmentVariable("PYTHONPATH"); if havePytPat then if Modelica.Utilities.Strings.find(pytPatOld, pytPatBuildings) == 0 then // The new python path is not yet in the environment variable, add it. pytPat:=pytPatOld + ":" + pytPatBuildings; else // The new python path is already in the variable. pytPat:=pytPatOld; end if; else pytPat := pytPatBuildings; end if; // Call the exchange function (dblRea, intRea) :=BaseClasses.exchange( moduleName=moduleName, functionName=functionName, pytObj=pytObj, passPythonObject=passPythonObject, pythonPath=pytPat, dblWri=dblWri, intWri=intWri, strWri=strWri, nDblWri=nDblWri, nDblRea=nDblRea, nIntWri=nIntWri, nIntRea=nIntRea, nStrWri=nStrWri); end exchange;