diff --git a/examples/cluster/plot_kmedoids_digits.py b/examples/cluster/plot_kmedoids_digits.py
index 8bb7ab11..10e30683 100644
--- a/examples/cluster/plot_kmedoids_digits.py
+++ b/examples/cluster/plot_kmedoids_digits.py
@@ -5,6 +5,7 @@
 In this example we compare different pairwise distance
 metrics for K-Medoids.
 """
+
 import numpy as np
 import matplotlib.pyplot as plt
 
diff --git a/examples/eigenpro/plot_eigenpro_synthetic.py b/examples/eigenpro/plot_eigenpro_synthetic.py
index 802f8a57..62696e9a 100644
--- a/examples/eigenpro/plot_eigenpro_synthetic.py
+++ b/examples/eigenpro/plot_eigenpro_synthetic.py
@@ -11,6 +11,7 @@
 the number of features exceeds 500, it begins to outperform
 SVM and shows more stability.
 """
+
 print(__doc__)
 
 import matplotlib
diff --git a/examples/kernel_approximation/plot_kernel_approximation.py b/examples/kernel_approximation/plot_kernel_approximation.py
index 6b8dab52..8b4603bd 100644
--- a/examples/kernel_approximation/plot_kernel_approximation.py
+++ b/examples/kernel_approximation/plot_kernel_approximation.py
@@ -41,6 +41,7 @@
 in :ref:`kernel_approximation`.
 
 """
+
 print(__doc__)
 
 # Author: Gael Varoquaux <gael dot varoquaux at normalesup dot org>
diff --git a/examples/plot_clara_digits.py b/examples/plot_clara_digits.py
index a703c948..8697307a 100644
--- a/examples/plot_clara_digits.py
+++ b/examples/plot_clara_digits.py
@@ -5,6 +5,7 @@
 In this example we compare different computation time of K-Medoids and CLARA on
 the handwritten digits data.
 """
+
 import numpy as np
 import matplotlib.pyplot as plt
 import time
diff --git a/sklearn_extra/cluster/tests/test_k_medoids.py b/sklearn_extra/cluster/tests/test_k_medoids.py
index 30f419a0..f18925e4 100644
--- a/sklearn_extra/cluster/tests/test_k_medoids.py
+++ b/sklearn_extra/cluster/tests/test_k_medoids.py
@@ -1,4 +1,5 @@
 """Testing for K-Medoids"""
+
 import warnings
 import numpy as np
 from unittest import mock