diff --git a/CHANGES.rst b/CHANGES.rst
index 2ff38ae81..f0ce712b0 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,6 @@
 0.17.2 (unreleased)
 ===================
-- Allow assignment to or creation of node attributes using dot notation of object instances 
+- Allow assignment to or creation of node attributes using dot notation of object instances
   with validation. []
 
 - Allow DNode and LNode subclass instances to be assigned to tree attributes and support
diff --git a/src/roman_datamodels/stnode/_node.py b/src/roman_datamodels/stnode/_node.py
index 2b4d0a650..0824d9ee6 100644
--- a/src/roman_datamodels/stnode/_node.py
+++ b/src/roman_datamodels/stnode/_node.py
@@ -18,6 +18,7 @@
 from astropy.time import Time
 
 from roman_datamodels.validate import ValidationWarning, _check_type, _error_message, will_strict_validate, will_validate
+
 from ._registry import SCALAR_NODE_CLASSES_BY_KEY
 
 __all__ = ["DNode", "LNode"]
@@ -63,9 +64,9 @@ def _validate(attr, instance, schema, ctx):
     # Note that the following checks cannot use isinstance since the TaggedObjectNode
     # and TaggedListNode subclasses will break as a result. And currently there is no
     # non-tagged subclasses of these classes that exist, nor are any envisioned yet.
-    if type(instance) == DNode: # noqa E721
+    if type(instance) == DNode:  # noqa E721
         instance = instance._data
-    elif type(instance) == LNode: # noqa E721
+    elif type(instance) == LNode:  # noqa E721
         instance = instance.data
     tagged_tree = yamlutil.custom_tree_to_tagged_tree(instance, ctx)
     return _value_change(attr, tagged_tree, schema, False, will_strict_validate(), ctx)
diff --git a/tests/test_models.py b/tests/test_models.py
index 7fe45379a..33241eae3 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -641,11 +641,12 @@ def test_node_assignment():
     darkexp = darkmodel.meta.exposure
     assert isinstance(darkexp, stnode.DNode)
     darkexp.ngroups = darkexp.ngroups + 1
-    assert(darkexp.ngroups == 7)
+    assert darkexp.ngroups == 7
     darkmodel.meta.exposure = darkexp
 
+
 # Test that a currently undefined attribute can be assigned using dot notation
-# so long as the attribute is defined in the coresponding schema.
+# so long as the attribute is defined in the corresponding schema.
 def test_node_new_attribute_assignment():
     exp = stnode.Exposure()
     with pytest.raises(AttributeError):
@@ -655,11 +656,11 @@ def test_node_new_attribute_assignment():
     # Test patternProperties attribute case
     photmod = utils.mk_wfi_img_photom()
     phottab = photmod.phot_table
-    newphottab = {'F062': phottab['F062']}
+    newphottab = {"F062": phottab["F062"]}
     photmod.phot_table = newphottab
-    photmod.phot_table.F213 = phottab['F213']
+    photmod.phot_table.F213 = phottab["F213"]
     with pytest.raises(AttributeError):
-        photmod.phot_table.F214 = phottab['F213']
+        photmod.phot_table.F214 = phottab["F213"]
     with pytest.raises(ValidationError):
         photmod.phot_table.F106 = 0