diff --git a/neo/rawio/medrawio.py b/neo/rawio/medrawio.py
index 454981dd8..a071a9bc8 100644
--- a/neo/rawio/medrawio.py
+++ b/neo/rawio/medrawio.py
@@ -240,7 +240,7 @@ def _get_analogsignal_chunk(self, block_index, seg_index, i_start, i_stop, strea
             self.sess.set_channel_active(self._stream_info[stream_index]["raw_chans"])
             num_channels = len(self._stream_info[stream_index]["raw_chans"])
             self.sess.set_reference_channel(self._stream_info[stream_index]["raw_chans"][0])
-        
+
         # in the case we have a slice or we give an ArrayLike we need to iterate through the channels
         # in order to activate them.
         else:
diff --git a/neo/test/iotest/test_plexonio.py b/neo/test/iotest/test_plexonio.py
index 5fc286671..b23e665c5 100644
--- a/neo/test/iotest/test_plexonio.py
+++ b/neo/test/iotest/test_plexonio.py
@@ -18,7 +18,7 @@ class TestPlexonIO(
         "plexon/File_plexon_1.plx",
         "plexon/File_plexon_2.plx",
         "plexon/File_plexon_3.plx",
-        "plexon/4chDemoPLX.plx"
+        "plexon/4chDemoPLX.plx",
     ]
 
 
diff --git a/neo/test/rawiotest/rawio_compliance.py b/neo/test/rawiotest/rawio_compliance.py
index e913c5cf5..f1b4e3a3e 100644
--- a/neo/test/rawiotest/rawio_compliance.py
+++ b/neo/test/rawiotest/rawio_compliance.py
@@ -224,7 +224,7 @@ def read_analogsignals(reader):
             i_start=i_start,
             i_stop=i_stop,
             stream_index=stream_index,
-            channel_indexes=slice(None)
+            channel_indexes=slice(None),
         )
         raw_chunk_channel_indexes = reader.get_analogsignal_chunk(
             block_index=block_index,
@@ -232,7 +232,7 @@ def read_analogsignals(reader):
             i_start=i_start,
             i_stop=i_stop,
             stream_index=stream_index,
-            channel_indexes=channel_indexes
+            channel_indexes=channel_indexes,
         )
 
         np.testing.assert_array_equal(raw_chunk_slice_none, raw_chunk_channel_indexes)
diff --git a/neo/test/rawiotest/test_plexonrawio.py b/neo/test/rawiotest/test_plexonrawio.py
index 06420c8c1..86207e904 100644
--- a/neo/test/rawiotest/test_plexonrawio.py
+++ b/neo/test/rawiotest/test_plexonrawio.py
@@ -15,7 +15,7 @@ class TestPlexonRawIO(
         "plexon/File_plexon_1.plx",
         "plexon/File_plexon_2.plx",
         "plexon/File_plexon_3.plx",
-        "plexon/4chDemoPLX.plx"
+        "plexon/4chDemoPLX.plx",
     ]