diff --git a/coxeter/__init__.py b/coxeter/__init__.py
index 5c3a0ac6..6ccb9fc9 100644
--- a/coxeter/__init__.py
+++ b/coxeter/__init__.py
@@ -21,4 +21,4 @@
 from . import families, io, shapes
 from .shape_getters import from_gsd_type_shapes
 
-__all__ = ["families", "shapes", "from_gsd_type_shapes", "io"]
\ No newline at end of file
+__all__ = ["families", "shapes", "from_gsd_type_shapes", "io"]
diff --git a/coxeter/io.py b/coxeter/io.py
index 1ebba2c1..3bc6c6ec 100644
--- a/coxeter/io.py
+++ b/coxeter/io.py
@@ -12,9 +12,10 @@
 
 import os
 from copy import deepcopy
-from importlib.metadata import version
 from xml.etree import ElementTree
+
 import numpy as np
+
 from coxeter import __version__
 
 
diff --git a/tests/test_io.py b/tests/test_io.py
index f5f64253..5e588a09 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -6,17 +6,19 @@
 # This software is licensed under the BSD 3-Clause License.
 """Regression tests for the I/O module."""
 
-import filecmp
 import tempfile
 from pathlib import Path
-from coxeter import io
-from coxeter.shapes import Polyhedron, ConvexPolyhedron
+
 import pytest
 
+from coxeter import io
+from coxeter.shapes import ConvexPolyhedron, Polyhedron
+
+
 def compare_text_files(file_path_1, file_path_2):
-    """Check whether two text files have identical contents, ignoring different 
+    """Check whether two text files have identical contents, ignoring different
     newline characters."""
-    with open(file_path_1, "r") as file1, open(file_path_2, "r") as file2:
+    with open(file_path_1) as file1, open(file_path_2) as file2:
         file1_contents, file2_contents = file1.readlines(), file2.readlines()
         assert file1_contents == file2_contents