trying to support python 3.13

armi/utils/flags.py

@@ -91,6 +91,7 @@ def __new__(cls, name, bases, attrs):
 
         # Auto fields have been resolved, so now collect all ints
         allFields = {name: val for name, val in attrs.items() if isinstance(val, int)}
+        allFields = {n: v for n, v in allFields.items() if not _FlagMeta.isdunder(n)}
         flagClass._nameToValue = allFields
         flagClass._valuesTaken = set(val for _, val in allFields.items())
         flagClass._autoAt = autoAt
@@ -104,6 +105,10 @@ def __new__(cls, name, bases, attrs):
 
         return flagClass
 
+    @staticmethod
+    def isdunder(s):
+        return s.startswith("__") and s.endswith("__")
+
     def __getitem__(cls, key):
         """
         Implement indexing at the class level.