Add Py_SetProgramName to make sure sys.argv[0] is set

src/EnergyPlus/PluginManager.cc

@@ -406,6 +406,11 @@ namespace EnergyPlus::PluginManagement {
         Py_SetPath(a);
         Py_SetPythonHome(a);
 
+        // must be called before Py_Initialize
+        // tells the interpreter the value of argv[0] to the main() function
+        // used by some functions to find run-time libraries relative to the interpreter executable
+        Py_SetProgramName((wchar_t*)programName);
+
         // now that we have set the path, we can initialize python
         // from https://docs.python.org/3/c-api/init.html
         // If arg 0, it skips init registration of signal handlers, which might be useful when Python is embedded.

src/EnergyPlus/PluginManager.hh

@@ -80,6 +80,8 @@ struct EnergyPlusData;
 
 namespace PluginManagement {
 
+    constexpr const char * programName = "python";
+
     void registerNewCallback(EnergyPlusData &state, EMSManager::EMSCallFrom iCalledFrom, const std::function<void (void *)>& f);
     void runAnyRegisteredCallbacks(EnergyPlusData &state, EMSManager::EMSCallFrom iCalledFrom, bool &anyRan);
     void onBeginEnvironment(EnergyPlusData &state);

src/EnergyPlus/api/plugin.py

@@ -53,6 +53,10 @@
 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 
+import sys
+if not hasattr(sys, 'argv'):
+    sys.argv = ['']
+
 from typing import List
 
 from pyenergyplus.api import EnergyPlusAPI