diff --git a/doc/conf.py b/doc/conf.py
index a462707..a67227a 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -1,4 +1,5 @@
 """Configuration file for the Sphinx documentation builder."""
+
 #
 # This file does only contain a selection of the most common options. For a
 # full list see the documentation:
diff --git a/examples/cow.py b/examples/cow.py
index fe6a338..a93e265 100644
--- a/examples/cow.py
+++ b/examples/cow.py
@@ -4,6 +4,7 @@
 
 Tetrahedralize a cow mesh.
 """
+
 # sphinx_gallery_thumbnail_number = 3
 import numpy as np
 import pyvista as pv
diff --git a/setup.py b/setup.py
index 3104860..e5048fd 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,5 @@
 """Setup for tetgen."""
+
 from io import open as io_open
 import os
 
diff --git a/tests/test_background_mesh.py b/tests/test_background_mesh.py
index 8823809..ffa8c6c 100644
--- a/tests/test_background_mesh.py
+++ b/tests/test_background_mesh.py
@@ -1,4 +1,5 @@
 """Test the mesh resizing feature of tetgen with sizing function."""
+
 from pathlib import Path
 import tempfile
 
diff --git a/tetgen/__init__.py b/tetgen/__init__.py
index af79c27..2276a7c 100644
--- a/tetgen/__init__.py
+++ b/tetgen/__init__.py
@@ -1,4 +1,5 @@
 """Tetgen module."""
+
 from tetgen import _tetgen
 from tetgen._version import __version__
 from tetgen.pytetgen import TetGen
diff --git a/tetgen/pytetgen.py b/tetgen/pytetgen.py
index 871f2f9..3c96532 100644
--- a/tetgen/pytetgen.py
+++ b/tetgen/pytetgen.py
@@ -1,4 +1,5 @@
 """Python module to interface with wrapped TetGen C++ code."""
+
 import ctypes
 import logging