diff --git a/wfdb/io/convert/tff.py b/wfdb/io/convert/tff.py
index c18c02d9..355a3eaf 100644
--- a/wfdb/io/convert/tff.py
+++ b/wfdb/io/convert/tff.py
@@ -4,6 +4,7 @@
 http://www.biomation.com/kin/me6000.htm
 
 """
+
 import datetime
 import os
 import struct
diff --git a/wfdb/io/header.py b/wfdb/io/header.py
index 0f0f7eed..98a1627b 100644
--- a/wfdb/io/header.py
+++ b/wfdb/io/header.py
@@ -4,6 +4,7 @@
 This module will eventually replace _header.py
 
 """
+
 import datetime
 import re
 from typing import List, Tuple
diff --git a/wfdb/io/record.py b/wfdb/io/record.py
index dfe3b987..09496396 100644
--- a/wfdb/io/record.py
+++ b/wfdb/io/record.py
@@ -411,9 +411,9 @@ def check_field(self, field, required_channels="all"):
                     field_name=field,
                     ndim=1,
                     parent_class=(
-                        lambda f: np.integer
-                        if f == "e_d_signal"
-                        else np.floating
+                        lambda f: (
+                            np.integer if f == "e_d_signal" else np.floating
+                        )
                     )(field),
                     channel_num=ch,
                 )
@@ -2725,9 +2725,7 @@ def wfdbtime(record_name, input_times, pn_dir=None):
         )
         if not times.startswith("s"):
             sample_num = int(
-                sum(
-                    x * 60**i for i, x in enumerate([seconds, minutes, hours])
-                )
+                sum(x * 60**i for i, x in enumerate([seconds, minutes, hours]))
                 * record.fs
             )
         sample_num = "s" + str(sample_num)
diff --git a/wfdb/io/util.py b/wfdb/io/util.py
index 1b3f4ad9..07b06dcc 100644
--- a/wfdb/io/util.py
+++ b/wfdb/io/util.py
@@ -1,6 +1,7 @@
 """
 A module for general utility functions
 """
+
 import math
 import os
 
diff --git a/wfdb/plot/__init__.py b/wfdb/plot/__init__.py
index 5210346a..bf801834 100644
--- a/wfdb/plot/__init__.py
+++ b/wfdb/plot/__init__.py
@@ -1,4 +1,5 @@
 """
 The plot subpackage contains tools for plotting signals and annotations.
 """
+
 from wfdb.plot.plot import plot_items, plot_wfdb, plot_all_records
diff --git a/wfdb/processing/evaluate.py b/wfdb/processing/evaluate.py
index d2c86202..3e960286 100644
--- a/wfdb/processing/evaluate.py
+++ b/wfdb/processing/evaluate.py
@@ -204,9 +204,9 @@ def compare(self):
                     )
                     # Assign the reference-test pair if close enough
                     if smallest_samp_diff < self.window_width:
-                        self.matching_sample_nums[
-                            ref_samp_num
-                        ] = closest_samp_num
+                        self.matching_sample_nums[ref_samp_num] = (
+                            closest_samp_num
+                        )
                     # Set the starting test sample number to inspect
                     # for the next reference sample.
                     test_samp_num = closest_samp_num + 1
diff --git a/wfdb/processing/qrs.py b/wfdb/processing/qrs.py
index 37c726bc..052f1dd9 100644
--- a/wfdb/processing/qrs.py
+++ b/wfdb/processing/qrs.py
@@ -1540,10 +1540,12 @@ def find_missing(r, p):
                                 tann = GQRS.Annotation(
                                     tmp_time,
                                     "TWAVE",
-                                    1
-                                    if tmp_time
-                                    > self.annot.time + self.c.rtmean
-                                    else 0,
+                                    (
+                                        1
+                                        if tmp_time
+                                        > self.annot.time + self.c.rtmean
+                                        else 0
+                                    ),
                                     rtdmin,
                                 )
                                 # if self.state == "RUNNING":