diff --git a/src/stpipe/hooks.py b/src/stpipe/hooks.py
index 7415ab05..6d61df74 100644
--- a/src/stpipe/hooks.py
+++ b/src/stpipe/hooks.py
@@ -3,8 +3,7 @@
 """
 import inspect
 
-from . import function_wrapper
-from . import utilities
+from . import function_wrapper, utilities
 from .step import Step
 
 
@@ -87,11 +86,13 @@ def get_hook_objects(step, hooktype, hooks):
     hooktype : str, "pre" or "post"
         strings, to indicate whether it is a pre- or post-hook
     hooks : str or class
-        path to executible script, or Step class to run as hook
+        path to executable script, or Step class to run as hook
 
     Returns
     -------
     list of callables that can be run as a hook
     """
-    return [hook_from_string_or_class(step, hooktype, i, hook)
-            for i, hook in enumerate(hooks)]
+    return [
+        hook_from_string_or_class(step, hooktype, i, hook)
+        for i, hook in enumerate(hooks)
+    ]
diff --git a/src/stpipe/subproc.py b/src/stpipe/subproc.py
index 91df891a..b9c0ad04 100644
--- a/src/stpipe/subproc.py
+++ b/src/stpipe/subproc.py
@@ -26,7 +26,6 @@ class SystemCall(Step):
     """  # noqa: E501
 
     def process(self, *args):
-
         newargs = []
         for i, arg in enumerate(args):
             if isinstance(arg, AbstractDataModel):
diff --git a/tests/test_hooks.py b/tests/test_hooks.py
index 5348c683..f1671efc 100644
--- a/tests/test_hooks.py
+++ b/tests/test_hooks.py
@@ -1,7 +1,5 @@
 import pytest
-
-from jwst.stpipe import Step, Pipeline
-
+from jwst.stpipe import Pipeline, Step
 
 pytest.importorskip("jwst")
 
@@ -38,7 +36,6 @@ def process(self, input_data):
 
 
 class HookStep(Step):
-
     class_alias = "myhook"
 
     spec = """
diff --git a/tests/test_utilities.py b/tests/test_utilities.py
index d0dbb992..33b10bf2 100644
--- a/tests/test_utilities.py
+++ b/tests/test_utilities.py
@@ -11,14 +11,15 @@ def test_func():
 class HovercraftFullOfEels:
     pass
 
-class Foo(Step):
 
+class Foo(Step):
     def process(self, input_data):
         pass
 
 
 def test_import_class():
     from stpipe import Step
+
     step_class = import_class("stpipe.Step", subclassof=Step)
     assert step_class is Step