diff --git a/examples/03_connectivity/plot_sphere_based_connectome.py b/examples/03_connectivity/plot_sphere_based_connectome.py
index 8740979424..b3ba1a3593 100644
--- a/examples/03_connectivity/plot_sphere_based_connectome.py
+++ b/examples/03_connectivity/plot_sphere_based_connectome.py
@@ -52,7 +52,7 @@
     'Posterior Cingulate Cortex',
     'Left Temporoparietal junction',
     'Right Temporoparietal junction',
-    'Medial prefrontal cortex'
+    'Medial prefrontal cortex',
     ]
 
 ##########################################################################
diff --git a/nilearn/plotting/img_plotting.py b/nilearn/plotting/img_plotting.py
index 1bde5f1f01..52d7867fd5 100644
--- a/nilearn/plotting/img_plotting.py
+++ b/nilearn/plotting/img_plotting.py
@@ -1374,7 +1374,7 @@ def plot_connectome_strength(adjacency_matrix, node_coords, node_size="auto",
     adjacency_matrix = np.nan_to_num(adjacency_matrix)
 
     adjacency_matrix_shape = adjacency_matrix.shape
-    if (len(adjacency_matrix_shape) != 2 or
+    if (len(adjacency_matrix_shape) != 2 or  # noqa: W504
             adjacency_matrix_shape[0] != adjacency_matrix_shape[1]):
         raise ValueError(
             "'adjacency_matrix' is supposed to have shape (n, n)."
@@ -1426,7 +1426,7 @@ def plot_connectome_strength(adjacency_matrix, node_coords, node_size="auto",
         )
         # reduce alpha for the least strong regions
         color[-1] = (
-            (region - strength_sorted.min()) *
+            (region - strength_sorted.min()) *  # noqa: W504
             (1 / (strength_sorted.max() - strength_sorted.min()))
         )
         # make color to be a 2D array
diff --git a/nilearn/plotting/tests/test_img_plotting.py b/nilearn/plotting/tests/test_img_plotting.py
index 9ecd0f2f9b..28d138bb8b 100644
--- a/nilearn/plotting/tests/test_img_plotting.py
+++ b/nilearn/plotting/tests/test_img_plotting.py
@@ -578,7 +578,7 @@ def test_connectome_strength():
             *args, output_file=filename, **kwargs
         )
         assert_true(display is None)
-        assert_true(os.path.isfile(filename) and
+        assert_true(os.path.isfile(filename) and  # noqa: W504
                     os.path.getsize(filename) > 0)
     finally:
         os.remove(filename)
@@ -659,7 +659,8 @@ def test_plot_connectome_strength_exceptions():
                         node_coords[:, 2], **kwargs)
 
     wrong_adjacency_matrix = np.zeros((3, 3))
-    assert_raises_regex(ValueError, r'Shape mismatch.+\(3L?, 3L?\).+\(2L?, 3L?\)',
+    assert_raises_regex(ValueError,
+                        r'Shape mismatch.+\(3L?, 3L?\).+\(2L?, 3L?\)',
                         plot_connectome_strength,
                         wrong_adjacency_matrix, node_coords, **kwargs)