Enhance model.set when destination is list

andes/core/model/model.py

@@ -508,7 +508,17 @@ def set(self, src, idx, attr, value):
         uid = self.idx2uid(idx)
         instance = self.__dict__[src]
 
-        instance.__dict__[attr][uid] = value
+        # Check if the destination is a list
+        if isinstance(instance.__dict__[attr], list):
+            # Use a for-loop to set values
+            if isinstance(uid, list):
+                for i, u in enumerate(uid):
+                    instance.__dict__[attr][u] = value[i]
+            else:
+                instance.__dict__[attr][uid] = value
+        else:
+            # Default behavior for numpy arrays or other types
+            instance.__dict__[attr][uid] = value
 
         # update differential equations' time constants stored in `dae.Tf`
 

andes/interop/pandapower.py

@@ -9,6 +9,12 @@
 from andes.shared import pd, rad2deg, deg2rad
 from andes.shared import pandapower as pp
 
+try:
+    nan = np.nan
+except AttributeError:
+    # for older numpy versions
+    nan = np.NAN
+
 logger = logging.getLogger(__name__)
 
 
@@ -315,7 +321,7 @@ def _to_pp_line(ssa, ssp, ssa_bus):
         tf_df['parallel'] = 1
         tf_df['oltc'] = False
         tf_df['tap_phase_shifter'] = False
-        tf_df['tap_step_degree'] = np.NaN
+        tf_df['tap_step_degree'] = np.nan
         tf_df['df'] = 1
         tf_df['std_type'] = None
 

docs/source/release-notes.rst

@@ -9,6 +9,10 @@ The APIs before v3.0.0 are in beta and may change without prior notice.
 v1.9 Notes
 ==========
 
+v1.9.4 (2025-xx-xx)
+-------------------
+- Enhance ``Model.set()`` to support assigning values when the destination is a list.
+
 v1.9.3 (2025-01-05)
 -------------------
 Development of connectivity manager ``ConnMan``:

tests/test_model_set.py

@@ -55,6 +55,10 @@ def test_model_set(self):
         np.testing.assert_equal(ss.GENROU.M.v[3], 6.0)
         self.assertEqual(ss.TDS.Teye[omega_addr[3], omega_addr[3]], 6.0)
 
+        # set when destination idx is list
+        ss.Bus.set(src='name', attr='v', idx=(1, 2, 3), value=['A', 'B', 'C'])
+        self.assertEqual(ss.Bus.name.v[:3], ['A', 'B', 'C'])
+
     def test_find_idx(self):
         ss = andes.load(andes.get_case('ieee14/ieee14_pvd1.xlsx'))
         mdl = ss.PVD1
@@ -131,3 +135,7 @@ def test_model_alter(self):
         # alter `vin` on instances without `vin` falls back to `v`
         ss.GENCLS.alter(src='p0', idx=2, value=1, attr='vin')
         self.assertEqual(ss.GENCLS.p0.v[1], 1)
+
+        # # alter `v` when destination idx is list
+        ss.Bus.alter(src='name', idx=[0, 1], value=['A', 'B'], attr='vin')
+        np.testing.assert_equal(ss.Bus.name.v[:2], ['A', 'B'])