diff --git a/src/aspire/classification/averager2d.py b/src/aspire/classification/averager2d.py
index 6e03b861b..b447a6d91 100644
--- a/src/aspire/classification/averager2d.py
+++ b/src/aspire/classification/averager2d.py
@@ -1,10 +1,8 @@
 import logging
-import warnings
 from abc import ABC, abstractmethod
 
 import numpy as np
 
-from aspire import config
 from aspire.basis import Coef
 from aspire.classification.reddy_chatterji import reddy_chatterji_register
 from aspire.image import Image, ImageStacker, MeanImageStacker
diff --git a/src/aspire/classification/rir_class2d.py b/src/aspire/classification/rir_class2d.py
index 6927d19bc..19a3479ff 100644
--- a/src/aspire/classification/rir_class2d.py
+++ b/src/aspire/classification/rir_class2d.py
@@ -195,7 +195,7 @@ def classify(self, diagnostics=False):
             # Report some information about reflections
             logger.info(
                 f"Count reflected: {np.sum(self.reflections)}"
-                f" {100 * np.mean(self.reflections) } %"
+                f" {100 * np.mean(self.reflections)} %"
             )
 
         return self.classes, self.reflections, self.distances
diff --git a/src/aspire/volume/symmetry_groups.py b/src/aspire/volume/symmetry_groups.py
index 6916e27ca..1384b951b 100644
--- a/src/aspire/volume/symmetry_groups.py
+++ b/src/aspire/volume/symmetry_groups.py
@@ -88,7 +88,7 @@ def parse(symmetry, dtype):
         }
         if symmetry_type not in map_to_sym_group.keys():
             raise ValueError(
-                f"Symmetry type {symmetry_type} not supported. Try: {*map_to_sym_group.keys(),}."
+                f"Symmetry type {symmetry_type} not supported. Try: {*map_to_sym_group.keys(), }."
             )
 
         symmetry_group = map_to_sym_group[symmetry_type]
diff --git a/tests/test_CtfEstimate.py b/tests/test_CtfEstimate.py
index b08b9fab9..26cc168d9 100644
--- a/tests/test_CtfEstimate.py
+++ b/tests/test_CtfEstimate.py
@@ -84,7 +84,7 @@ def test_estimate_CTF():
                         "Defocus Angle (degrees):"
                         f"\n\tASPIRE= {defocus_ang_degrees:0.2f}*"
                         f'\n\tCTFFIND4= {TEST_OUTPUT["defocus_ang"]:0.2f}*'
-                        f'\n\tError: {abs((TEST_OUTPUT["defocus_ang"]- defocus_ang_degrees)/TEST_OUTPUT["defocus_ang"]) * 100:0.2f}%'
+                        f'\n\tError: {abs((TEST_OUTPUT["defocus_ang"] - defocus_ang_degrees)/TEST_OUTPUT["defocus_ang"]) * 100:0.2f}%'
                     )
 
                 for param in ["cs", "amplitude_contrast", "voltage", "pixel_size"]:
diff --git a/tests/test_averager2d.py b/tests/test_averager2d.py
index 1c1c13326..1bbb7ca18 100644
--- a/tests/test_averager2d.py
+++ b/tests/test_averager2d.py
@@ -1,13 +1,9 @@
-import importlib
 import logging
 import os
-import platform
-from importlib.metadata import version
 from unittest import TestCase
 
 import numpy as np
 import pytest
-from packaging.version import parse as parse_version
 
 from aspire.basis import FFBBasis2D
 from aspire.classification import (