Avoided 3.9 attributeError limits.

montepy/mcnp_object.py

@@ -4,6 +4,12 @@
 import copy
 import functools
 import itertools as it
+import numpy as np
+import sys
+import textwrap
+import warnings
+import weakref
+
 from montepy.errors import *
 from montepy.constants import (
     BLANK_SPACE_CONTINUE,
@@ -18,10 +24,6 @@
     ValueNode,
 )
 import montepy
-import numpy as np
-import textwrap
-import warnings
-import weakref
 
 
 class _ExceptionContextAdder(ABCMeta):
@@ -146,10 +148,15 @@ def __setattr__(self, key, value):
         if key.startswith("_"):
             super().__setattr__(key, value)
         else:
+            # kwargs added in 3.10
+            if sys.version_info >= (3, 10):
+                raise AttributeError(
+                    f"'{type(self).__name__}' object has no attribute '{key}'",
+                    obj=self,
+                    name=key,
+                )
             raise AttributeError(
                 f"'{type(self).__name__}' object has no attribute '{key}'",
-                obj=self,
-                name=key,
             )
 
     @staticmethod

tests/test_cell_problem.py

@@ -322,6 +322,7 @@ def test_cell_clone_bad(args, error):
     with pytest.raises(error):
         cell.clone(*args)
 
+
 def test_bad_setattr():
     cell = montepy.Cell()
     with pytest.raises(AttributeError):

tests/test_nuclide.py

@@ -169,7 +169,7 @@ def test_fancy_names_pbt(
             new_isotope = Nuclide(Z=Z, A=A + 5, meta_state=meta)
             assert new_isotope != isotope
             assert isotope < new_isotope
-            if library_base < 999:
+            if library_base < 998:
                 new_isotope = Nuclide(
                     Z=Z,
                     A=A,