diff --git a/insights/combiners/grubby.py b/insights/combiners/grubby.py
index 1e003e426..98f023ecd 100644
--- a/insights/combiners/grubby.py
+++ b/insights/combiners/grubby.py
@@ -1,7 +1,6 @@
 """
 Grubby
 ======
-
 Combiner for command ``/usr/sbin/grubby`` parsers.
 
 This combiner uses the parsers:
@@ -28,16 +27,20 @@ class Grubby(object):
     Raises:
         ParseException: when parsing into error.
     """
+
     def __init__(self, grubby_info_all, grubby_default_index):
         self.boot_entries = grubby_info_all.boot_entries
         self.default_index = grubby_default_index.default_index
 
         if self.default_index not in self.boot_entries:
-            raise ParseException("DEFAULT index %s not exist in parsed boot_entries: %s" %
-                                    (self.default_index, list(self.boot_entries.keys())))
+            raise ParseException(
+                "DEFAULT index %s not exist in parsed boot_entries: %s"
+                % (self.default_index, list(self.boot_entries.keys()))
+            )
         self.default_boot_entry = self.boot_entries[self.default_index]
 
         self.default_kernel = self.default_boot_entry.get("kernel")
         if not self.default_kernel:
-            raise ParseException("DEFAULT kernel-path not exist in default-index: %s" %
-                                    self.default_index)
+            raise ParseException(
+                "DEFAULT kernel-path not exist in default-index: %s" % self.default_index
+            )
diff --git a/insights/parsers/grubby.py b/insights/parsers/grubby.py
index 4e0d3eb69..f5872b975 100644
--- a/insights/parsers/grubby.py
+++ b/insights/parsers/grubby.py
@@ -1,5 +1,5 @@
 """
-grubby - command ``/usr/sbin/grubby``
+Grubby - command ``/usr/sbin/grubby``
 =====================================
 
 This is a collection of parsers that all deal with the command ``grubby``.
@@ -14,6 +14,7 @@
 GrubbyInfoAll - command ``grubby --info=ALL``
 ---------------------------------------------
 """
+
 from insights.core import CommandParser
 from insights.core.exceptions import ParseException, SkipComponent
 from insights.core.plugins import parser
@@ -41,6 +42,7 @@ class GrubbyDefaultIndex(CommandParser):
     Attributes:
         default_index (int): the numeric index of the current default boot entry, count from 0
     """
+
     def parse_content(self, content):
         if not content:
             raise SkipComponent('Empty output')
@@ -74,9 +76,13 @@ class GrubbyDefaultKernel(CommandParser):
     Attributes:
         default_kernel(str): The default kernel name for next boot
     """
+
     def __init__(self, context):
-        deprecated(GrubbyDefaultKernel,
-                   "Please use the :class:`insights.combiners.grubby.Grubby` instead.", "3.7.0")
+        deprecated(
+            GrubbyDefaultKernel,
+            "Please use the :class:`insights.combiners.grubby.Grubby` instead.",
+            "3.7.0",
+        )
         super(GrubbyDefaultKernel, self).__init__(context)
 
     def parse_content(self, content):
@@ -145,6 +151,7 @@ class GrubbyInfoAll(CommandParser):
         SkipComponent: When output is empty
         ParseException: When output is invalid
     """
+
     def parse_content(self, content):
 
         def _parse_args(args):
diff --git a/insights/tests/combiners/test_grubby.py b/insights/tests/combiners/test_grubby.py
index 0f4616639..95d87b3c1 100644
--- a/insights/tests/combiners/test_grubby.py
+++ b/insights/tests/combiners/test_grubby.py
@@ -52,7 +52,9 @@ def test_grubby():
             'crashkernel': ['1G-4G:192M,4G-64G:256M,64G-:512M'],
             'resume': ['/dev/mapper/rhel-swap'],
             'rd.lvm.lv': ['rhel/root', 'rhel/swap'],
-            'rhgb': [True], 'quiet': [True], 'retbleed': ['stuff'],
+            'rhgb': [True],
+            'quiet': [True],
+            'retbleed': ['stuff'],
         },
         root="/dev/mapper/rhel-root",
         initrd="/boot/initramfs-5.14.0-162.6.1.el9_1.x86_64.img",
diff --git a/insights/tests/parsers/test_grubby.py b/insights/tests/parsers/test_grubby.py
index 014fd13ec..9cc76e30a 100644
--- a/insights/tests/parsers/test_grubby.py
+++ b/insights/tests/parsers/test_grubby.py
@@ -3,11 +3,7 @@
 
 from insights.core.exceptions import ParseException, SkipComponent
 from insights.parsers import grubby
-from insights.parsers.grubby import (
-    GrubbyDefaultIndex,
-    GrubbyDefaultKernel,
-    GrubbyInfoAll
-)
+from insights.parsers.grubby import GrubbyDefaultIndex, GrubbyDefaultKernel, GrubbyInfoAll
 from insights.tests import context_wrap
 
 DEFAULT_INDEX_1 = '0'
@@ -179,7 +175,9 @@ def test_grubby_info_all():
             'crashkernel': ['1G-4G:192M,4G-64G:256M,64G-:512M'],
             'resume': ['/dev/mapper/rhel-swap'],
             'rd.lvm.lv': ['rhel/root', 'rhel/swap'],
-            'rhgb': [True], 'quiet': [True], 'retbleed': ['stuff'],
+            'rhgb': [True],
+            'quiet': [True],
+            'retbleed': ['stuff'],
         },
         root="/dev/mapper/rhel-root",
         initrd="/boot/initramfs-5.14.0-162.6.1.el9_1.x86_64.img",
@@ -216,9 +214,9 @@ def test_grubby_info_all_ab():
 
 def test_doc_examples():
     env = {
-            'grubby_default_index': GrubbyDefaultIndex(context_wrap(DEFAULT_INDEX_1)),
-            'grubby_default_kernel': GrubbyDefaultKernel(context_wrap(DEFAULT_KERNEL)),
-            'grubby_info_all': GrubbyInfoAll(context_wrap(GRUBBY_INFO_ALL_1)),
-          }
+        'grubby_default_index': GrubbyDefaultIndex(context_wrap(DEFAULT_INDEX_1)),
+        'grubby_default_kernel': GrubbyDefaultKernel(context_wrap(DEFAULT_KERNEL)),
+        'grubby_info_all': GrubbyInfoAll(context_wrap(GRUBBY_INFO_ALL_1)),
+    }
     failed, total = doctest.testmod(grubby, globs=env)
     assert failed == 0