diff --git a/issue_metrics.py b/issue_metrics.py
index f3d28a0..8cd9834 100644
--- a/issue_metrics.py
+++ b/issue_metrics.py
@@ -126,7 +126,7 @@ def get_per_issue_metrics(
     labels: Union[List[str], None] = None,
     ignore_users: Union[List[str], None] = None,
     max_comments_to_eval: int = 20,
-    heavily_involved: int = 3
+    heavily_involved: int = 3,
 ) -> tuple[List, int, int]:
     """
     Calculate the metrics for each issue/pr/discussion in a list provided.
@@ -165,8 +165,13 @@ def get_per_issue_metrics(
                 None, issue, ignore_users
             )
             issue_with_metrics.mentor_activity = count_comments_per_user(
-                None, issue, ignore_users, None, None,
-                max_comments_to_eval, heavily_involved
+                None,
+                issue,
+                ignore_users,
+                None,
+                None,
+                max_comments_to_eval,
+                heavily_involved,
             )
             issue_with_metrics.time_to_answer = measure_time_to_answer(issue)
             if issue["closedAt"]:
@@ -195,8 +200,13 @@ def get_per_issue_metrics(
                 issue, None, pull_request, ready_for_review_at, ignore_users
             )
             issue_with_metrics.mentor_activity = count_comments_per_user(
-                issue, None, pull_request, ready_for_review_at, ignore_users,
-                max_comments_to_eval, heavily_involved
+                issue,
+                None,
+                pull_request,
+                ready_for_review_at,
+                ignore_users,
+                max_comments_to_eval,
+                heavily_involved,
             )
             if labels:
                 issue_with_metrics.label_metrics = get_label_metrics(issue, labels)
diff --git a/most_active_mentors.py b/most_active_mentors.py
index 5b9acd0..99bdfae 100755
--- a/most_active_mentors.py
+++ b/most_active_mentors.py
@@ -33,9 +33,10 @@
         Count the number of mentors active at least n times
 
 """
+
 from collections import Counter
 from datetime import datetime
-from typing import List, Union
+from typing import Dict, List, Union
 
 import github3
 from classes import IssueWithMetrics
@@ -46,7 +47,7 @@ def count_comments_per_user(
     discussion: Union[dict, None] = None,
     pull_request: Union[github3.pulls.PullRequest, None] = None,
     ready_for_review_at: Union[datetime, None] = None,
-    ignore_users: List[str] = None,
+    ignore_users: List[str] | None = None,
     max_comments_to_eval=20,
     heavily_involved=3,
 ) -> dict:
@@ -67,7 +68,7 @@ def count_comments_per_user(
     """
     if ignore_users is None:
         ignore_users = []
-    mentor_count = {}
+    mentor_count: Dict[str, int] = {}
 
     # Get the first comments
     if issue:
@@ -118,7 +119,7 @@ def count_comments_per_user(
                     comment.user,
                     ignore_users,
                     comment.submitted_at,
-                    comment.ready_for_review_at
+                    comment.ready_for_review_at,
                 ):
                     continue
 
@@ -139,7 +140,7 @@ def ignore_comment(
     ready_for_review_at: Union[datetime, None],
 ) -> bool:
     """Check if a comment should be ignored."""
-    return (
+    return bool(
         # ignore comments by IGNORE_USERS
         comment_user.login in ignore_users
         # ignore comments by bots
@@ -151,11 +152,8 @@ def ignore_comment(
     )
 
 
-def get_mentor_count(
-    issues_with_metrics: List[IssueWithMetrics],
-    cutoff: int
-) -> int:
-    """ Calculate the number of active mentors on the project.
+def get_mentor_count(issues_with_metrics: List[IssueWithMetrics], cutoff: int) -> int:
+    """Calculate the number of active mentors on the project.
 
     Args:
         issues_with_metrics (List[IssueWithMetrics]): A list of issues w/
@@ -168,7 +166,7 @@ def get_mentor_count(
 
     """
 
-    mentor_count = Counter({})
+    mentor_count: Counter[str] = Counter({})
     for issue_with_metrics in issues_with_metrics:
         current_counter = Counter(issue_with_metrics.mentor_activity)
         mentor_count = mentor_count + current_counter
diff --git a/test_most_active_mentors.py b/test_most_active_mentors.py
index 7c5defd..15edb95 100755
--- a/test_most_active_mentors.py
+++ b/test_most_active_mentors.py
@@ -10,6 +10,7 @@
         get_mentor_count function.
 
 """
+
 import unittest
 from datetime import datetime
 from unittest.mock import MagicMock
@@ -40,7 +41,10 @@ def test_count_comments_per_user(self):
         for i in range(22):
             mock_comment1 = MagicMock()
             mock_comment1.user.login = "very_active_user"
-            mock_comment1.created_at = datetime.fromisoformat(f"2023-01-02T{i:02d}:00:00Z")
+            mock_comment1.created_at = datetime.fromisoformat(
+                f"2023-01-02T{i:02d}:00:00Z"
+            )
+            # pylint: disable=maybe-no-member
             mock_issue1.issue.comments.return_value.append(mock_comment1)
 
         # Call the function
@@ -51,19 +55,25 @@ def test_count_comments_per_user(self):
         self.assertEqual(result, expected_result)
 
     def test_get_mentor_count(self):
-        """ Test that get_mentor_count correctly counts comments per user.
-
-        """
+        """Test that get_mentor_count correctly counts comments per user."""
         mentor_activity = {"sue": 15, "bob": 10}
 
         # Create moc data
         issues_with_metrics = [
             IssueWithMetrics(
-                "Issue 1", "https://github.com/user/repo/issues/1",
-                "alice", None, mentor_activity=mentor_activity),
+                "Issue 1",
+                "https://github.com/user/repo/issues/1",
+                "alice",
+                None,
+                mentor_activity=mentor_activity,
+            ),
             IssueWithMetrics(
-                "Issue 2", "https://github.com/user/repo/issues/2",
-                "bob", None, mentor_activity=mentor_activity),
+                "Issue 2",
+                "https://github.com/user/repo/issues/2",
+                "bob",
+                None,
+                mentor_activity=mentor_activity,
+            ),
         ]
 
         # Call the function and check the result