The function constructor is a C function that is
called by a Modelica simulator exactly once during the
initialization. The function returns the object
PythonObject that will be used to store a Python
object and pass it from one invocation to another in the function
Buildings.Utilities.IO.Python_3_8.Functions.BaseClasses.exchange.
impure function constructor output PythonObject pytObj; end constructor;
LibraryDirectory annotation.