diff --git a/mep3_driver/launch/driver_launch.py b/mep3_driver/launch/driver_launch.py
index 951ea9fbc..4d61095d0 100644
--- a/mep3_driver/launch/driver_launch.py
+++ b/mep3_driver/launch/driver_launch.py
@@ -8,8 +8,10 @@
 def generate_launch_description():
     package_dir = get_package_share_directory('mep3_driver')
 
-    robot_description = pathlib.Path(os.path.join(package_dir, 'resource', 'mep3_big_config.urdf')).read_text()
-    ros2_control_params = os.path.join(package_dir, 'resource', 'mep3_big_ros2_control.yaml')
+    robot_description = pathlib.Path(os.path.join(
+        package_dir, 'resource', 'mep3_big_config.urdf')).read_text()
+    ros2_control_params = os.path.join(
+        package_dir, 'resource', 'mep3_big_ros2_control.yaml')
 
     controller_manager_node = Node(
         package="controller_manager",
diff --git a/mep3_simulation/launch/robot_launch.py b/mep3_simulation/launch/robot_launch.py
index 6ce7cc32c..2733261c7 100644
--- a/mep3_simulation/launch/robot_launch.py
+++ b/mep3_simulation/launch/robot_launch.py
@@ -1,12 +1,14 @@
 import os
 import pathlib
-import launch
+
+from ament_index_python.packages import get_package_share_directory
 from launch_ros.actions import Node
-from launch.substitutions import LaunchConfiguration
+from webots_ros2_core.webots_launcher import WebotsLauncher
+
+import launch
 from launch.actions import IncludeLaunchDescription
 from launch.launch_description_sources import PythonLaunchDescriptionSource
-from ament_index_python.packages import get_package_share_directory
-from webots_ros2_core.webots_launcher import WebotsLauncher
+from launch.substitutions import LaunchConfiguration
 
 
 def generate_launch_description():
@@ -41,11 +43,12 @@ def generate_launch_description():
         arguments=['joint_state_broadcaster'] + controller_manager_timeout,
     )
 
-    # The node which interacts with a robot in the Webots simulation is located in the
-    # `webots_ros2_driver` package under name `driver`.
+    # The node which interacts with a robot in the Webots simulation is located
+    # in the `webots_ros2_driver` package under name `driver`.
     # It is necessary to run such a node for each robot in the simulation.
-    # Typically, we provide it the `robot_description` parameters from a URDF file and
-    # `ros2_control_params` from the `ros2_control` configuration file.
+    # Typically, we provide it the `robot_description` parameters from a URDF
+    # file and `ros2_control_params` from the `ros2_control`
+    # configuration file.
     webots_robot_driver = Node(
         package='webots_ros2_driver',
         executable='driver',
@@ -58,13 +61,13 @@ def generate_launch_description():
         ]
     )
 
-    # Often we want to publish robot transforms, so we use the `robot_state_publisher`
-    # node for that.
-    # If robot model is not specified in the URDF file then Webots can help us with the
-    # URDF exportation feature.
-    # Since the exportation feature is available only once the simulation has started and
-    # the `robot_state_publisher` node requires a `robot_description` parameter before we
-    # have to specify a dummy robot.
+    # Often we want to publish robot transforms, so we use the
+    # `robot_state_publisher` node for that.
+    # If robot model is not specified in the URDF file then Webots can help
+    # us with the URDF exportation feature.
+    # Since the exportation feature is available only once the simulation has
+    # started and the `robot_state_publisher` node requires a
+    # `robot_description` parameter before we have to specify a dummy robot.
     robot_state_publisher = Node(
         package='robot_state_publisher',
         executable='robot_state_publisher',
diff --git a/mep3_simulation/setup.py b/mep3_simulation/setup.py
index 2bf16c7c8..0941ec838 100644
--- a/mep3_simulation/setup.py
+++ b/mep3_simulation/setup.py
@@ -1,6 +1,7 @@
-from setuptools import setup
-from glob import glob
 import os
+from glob import glob
+
+from setuptools import setup
 
 package_name = 'mep3_simulation'
 
@@ -18,11 +19,12 @@
 }
 
 
-def files_in_directory(dir, extension=None):
+def files_in_directory(path, extension=None):
     files = []
-    for i in os.listdir(dir):
-        if not os.path.isdir(f'{dir}/{i}') and (extension is None or i.endswith(extension)):
-            files.append(f'{dir}/{i}')
+    for i in os.listdir(path):
+        if not os.path.isdir(f'{path}/{i}') and \
+                (extension is None or i.endswith(extension)):
+            files.append(f'{path}/{i}')
     return files