diff --git a/ros2topic/ros2topic/eval/__init__.py b/ros2topic/ros2topic/eval/__init__.py
index 47863c1ed..6c7ccbfab 100644
--- a/ros2topic/ros2topic/eval/__init__.py
+++ b/ros2topic/ros2topic/eval/__init__.py
@@ -1,24 +1,23 @@
-# MIT License
-
-# Copyright (c) 2022 Yaroslav Polyakov
-
+# Copyright 2022 Yaroslav Polyakov
+#
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
 # in the Software without restriction, including without limitation the rights
 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 # copies of the Software, and to permit persons to whom the Software is
 # furnished to do so, subject to the following conditions:
-
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
 
 """Safe user-supplied python expression evaluation."""
 
@@ -131,6 +130,7 @@ def generic_visit(self, node):
 
 
 class Expr():
+
     def __init__(self, expr, model=None, filename=None):
 
         self.expr = expr
diff --git a/ros2topic/ros2topic/verb/hz.py b/ros2topic/ros2topic/verb/hz.py
index e1f0832e7..309a94800 100644
--- a/ros2topic/ros2topic/verb/hz.py
+++ b/ros2topic/ros2topic/verb/hz.py
@@ -123,6 +123,7 @@ def _setup_base_safe_eval():
     safe_eval_model.allowed_functions.extend(safe_builtins)
     return safe_eval_model
 
+
 def _setup_safe_eval(safe_eval_model, msg_class, topic):
     # allow-list topic builtins, msg attributes
     topic_builtins = [i for i in dir(topic) if not i.startswith('_')]