Adapt Element coupling strings

imcs-compsim · Dec 16, 2024 · 669b32e · 669b32e
1 parent 7f6c75a
commit 669b32e
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/meshpy/element_beam.py b/meshpy/element_beam.py
@@ -31,7 +31,7 @@
 """This module implements beam elements for the mesh."""
 
 import warnings
-from typing import Any
+from typing import Any, Optional
 
 import numpy as np
 import vtk
@@ -62,8 +62,8 @@ class Beam(Element):
     valid_material: Any = []
 
     # Coupling strings.
-    coupling_fix_string = ""
-    coupling_joint_string = ""
+    coupling_fix_string: Optional[str] = None
+    coupling_joint_string: Optional[str] = None
 
     def __init__(self, material=None, nodes=None):
         super().__init__(nodes=nodes, material=material)