diff --git a/docs/conf.py b/docs/conf.py
index 083d3532..cd34e7e3 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -57,18 +57,18 @@
 master_doc = "index"
 
 # General information about the project.
-project = u"schedule"
-copyright = u'2020, <a href="https://dbader.org/">Daniel Bader</a>'
-author = u'<a href="https://dbader.org/">Daniel Bader</a>'
+project = "schedule"
+copyright = '2020, <a href="https://dbader.org/">Daniel Bader</a>'
+author = '<a href="https://dbader.org/">Daniel Bader</a>'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
 # The short X.Y version.
-version = u"1.2.0"
+version = "1.2.0"
 # The full version, including alpha/beta/rc tags.
-release = u"1.2.0"
+release = "1.2.0"
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -284,8 +284,8 @@
     (
         master_doc,
         "schedule.tex",
-        u"schedule Documentation",
-        u"Daniel Bader",
+        "schedule Documentation",
+        "Daniel Bader",
         "manual",
     ),
 ]
@@ -327,7 +327,7 @@
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [(master_doc, "schedule", u"schedule Documentation", [author], 1)]
+man_pages = [(master_doc, "schedule", "schedule Documentation", [author], 1)]
 
 # If true, show URL addresses after external links.
 #
@@ -343,7 +343,7 @@
     (
         master_doc,
         "schedule",
-        u"schedule Documentation",
+        "schedule Documentation",
         author,
         "schedule",
         "One line description of project.",
diff --git a/schedule/__init__.py b/schedule/__init__.py
index 2db9b0ad..2e587a16 100644
--- a/schedule/__init__.py
+++ b/schedule/__init__.py
@@ -37,14 +37,14 @@
 [2] https://github.com/Rykian/clockwork
 [3] https://adam.herokuapp.com/past/2010/6/30/replace_cron_with_clockwork/
 """
-from collections.abc import Hashable
 import datetime
 import functools
 import logging
 import random
 import re
 import time
-from typing import Set, List, Optional, Callable, Union
+from collections.abc import Hashable
+from typing import Callable, List, Optional, Set, Union
 
 logger = logging.getLogger("schedule")
 
@@ -295,7 +295,7 @@ def is_repr(j):
 
         if self.job_func is not None:
             args = [repr(x) if is_repr(x) else str(x) for x in self.job_func.args]
-            kwargs = ["%s=%s" % (k, repr(v)) for k, v in self.job_func.keywords.items()]
+            kwargs = [f"{k}={repr(v)}" for k, v in self.job_func.keywords.items()]
             call_repr = job_func_name + "(" + ", ".join(args + kwargs) + ")"
         else:
             call_repr = "[None]"
@@ -545,7 +545,7 @@ def at(self, time_str: str, tz: Optional[str] = None):
             second = 0
         if self.unit == "days" or self.start_day:
             hour = int(hour)
-            if not (0 <= hour <= 23):
+            if not 0 <= hour <= 23:
                 raise ScheduleValueError(
                     "Invalid number of hours ({} is not between 0 and 23)"
                 )
@@ -710,7 +710,7 @@ def _schedule_next_run(self) -> None:
             )
 
         if self.latest is not None:
-            if not (self.latest >= self.interval):
+            if not self.latest >= self.interval:
                 raise ScheduleError("`latest` is greater than `interval`")
             interval = random.randint(self.interval, self.latest)
         else:
@@ -732,7 +732,7 @@ def _schedule_next_run(self) -> None:
             )
             if self.start_day not in weekdays:
                 raise ScheduleValueError(
-                    "Invalid start day (valid start days are {})".format(weekdays)
+                    f"Invalid start day (valid start days are {weekdays})"
                 )
             weekday = weekdays.index(self.start_day)
             days_ahead = weekday - self.next_run.weekday()
diff --git a/setup.py b/setup.py
index a56d374a..50382c63 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 import codecs
-from setuptools import setup
 
+from setuptools import setup
 
 SCHEDULE_VERSION = "1.2.0"
 SCHEDULE_DOWNLOAD_URL = "https://github.com/dbader/schedule/tarball/" + SCHEDULE_VERSION
diff --git a/test_schedule.py b/test_schedule.py
index 7d4617ec..46694e58 100644
--- a/test_schedule.py
+++ b/test_schedule.py
@@ -1,23 +1,20 @@
 """Unit tests for schedule.py"""
 import datetime
 import functools
-import mock
-import unittest
 import os
 import time
+import unittest
+
+import mock
+
+import schedule
+from schedule import (IntervalError, ScheduleError, ScheduleValueError, every,
+                      repeat)
 
 # Silence "missing docstring", "method could be a function",
 # "class already defined", and "too many public methods" messages:
-# pylint: disable-msg=R0201,C0111,E0102,R0904,R0901
+# pylint: disable-msg=C0111,E0102,R0904,R0901
 
-import schedule
-from schedule import (
-    every,
-    repeat,
-    ScheduleError,
-    ScheduleValueError,
-    IntervalError,
-)
 
 # Set timezone to Europe/Berlin (CEST) to ensure global reproducibility
 os.environ["TZ"] = "CET-1CEST,M3.5.0,M10.5.0"