diff --git a/fissa/core.py b/fissa/core.py
index c9dec19a..06ad9076 100644
--- a/fissa/core.py
+++ b/fissa/core.py
@@ -1323,7 +1323,7 @@ def save_prep(self, destination=None):
                 field: getattr(self, field)
                 for field in fields
                 if getattr(self, field) is not None
-            }
+            },
         )
 
     def separate(self, redo_prep=False, redo_sep=False):
@@ -1541,7 +1541,7 @@ def save_separated(self, destination=None):
                 field: getattr(self, field)
                 for field in fields
                 if getattr(self, field) is not None
-            }
+            },
         )
 
     def calc_deltaf(self, freq, use_raw_f0=True, across_trials=True):
@@ -1874,7 +1874,7 @@ def run_fissa(
     return_deltaf=False,
     deltaf_across_trials=True,
     export_to_matfile=False,
-    **kwargs
+    **kwargs,
 ):
     r"""
     Function-based interface to run FISSA on an experiment.
diff --git a/fissa/neuropil.py b/fissa/neuropil.py
index 3f089aac..8fbea3cb 100644
--- a/fissa/neuropil.py
+++ b/fissa/neuropil.py
@@ -245,7 +245,7 @@ def separate(
                 print("{}Trying a new random state.".format(prefix))
             # Change to a new random_state
             if random_state is not None:
-                random_state = (random_state + 1) % 2 ** 32
+                random_state = (random_state + 1) % 2**32
 
     if estimator.n_iter_ == max_iter:
         if verbosity >= 1:
diff --git a/fissa/tests/test_polygons.py b/fissa/tests/test_polygons.py
index 7aae06da..2d1a079a 100644
--- a/fissa/tests/test_polygons.py
+++ b/fissa/tests/test_polygons.py
@@ -23,6 +23,7 @@
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 """
+
 # Unit tests for sima/ROI.py
 # Tests follow conventions for NumPy/SciPy available at
 # https://github.com/numpy/numpy/blob/master/doc/TESTS.rst.txt