Fill units only when requested (#422)

src/ansys/dpf/post/simulation.py

@@ -81,10 +81,7 @@ def __init__(self, data_sources: DataSources, model: Model):
         self._active_selection = None
         self._named_selections = None
         self._mesh = None
-        self._units = {
-            "time/frequency": self.time_freq_support.time_frequencies.unit,
-            "distance": self._model.metadata.meshed_region.unit,
-        }
+        self._units = None
         self._time_freq_precision = None
 
     def release_streams(self):
@@ -331,6 +328,11 @@ def set_ids(self) -> List:
     @property
     def units(self):
         """Returns the current time/frequency and distance units used."""
+        if self._units is None:
+            self._units = {
+                "time/frequency": self.time_freq_support.time_frequencies.unit,
+                "distance": self._model.metadata.meshed_region.unit,
+            }
         return self._units
 
     def __str__(self):

tests/test_simulation.py

@@ -44,6 +44,13 @@ def test_simulation_init_with_server(static_rst, grpc_server):
     assert simulation._model._server == grpc_server
 
 
+def test_simulation_units(static_simulation):
+    assert static_simulation._units is None
+    assert static_simulation.units is not None
+    assert static_simulation.units["time/frequency"] == "s"
+    assert static_simulation.units["distance"] == "m"
+
+
 def test_simulation_results(static_simulation):
     results = static_simulation.results
     assert len(results) == 12