diff --git a/plexapi/alert.py b/plexapi/alert.py
index bf6e5394f..9e0310fd5 100644
--- a/plexapi/alert.py
+++ b/plexapi/alert.py
@@ -84,4 +84,4 @@ def _onError(self, *args):  # pragma: no cover
             This is to support compatibility with current and previous releases of websocket-client.
         """
         err = args[-1]
-        log.error('AlertListener Error: %s' % err)
+        log.error('AlertListener Error: %s', err)
diff --git a/plexapi/base.py b/plexapi/base.py
index 9c3446be3..96dbad604 100644
--- a/plexapi/base.py
+++ b/plexapi/base.py
@@ -397,7 +397,7 @@ def __getattribute__(self, attr):
         clsname = self.__class__.__name__
         title = self.__dict__.get('title', self.__dict__.get('name'))
         objname = "%s '%s'" % (clsname, title) if title else clsname
-        log.debug("Reloading %s for attr '%s'" % (objname, attr))
+        log.debug("Reloading %s for attr '%s'", objname, attr)
         # Reload and return the value
         self.reload()
         return super(PlexPartialObject, self).__getattribute__(attr)
@@ -501,7 +501,7 @@ def delete(self):
             return self._server.query(self.key, method=self._server._session.delete)
         except BadRequest:  # pragma: no cover
             log.error('Failed to delete %s. This could be because you '
-                'havnt allowed items to be deleted' % self.key)
+                'have not allowed items to be deleted', self.key)
             raise
 
     def history(self, maxresults=9999999, mindate=None):
diff --git a/plexapi/library.py b/plexapi/library.py
index 85e4a1441..206eb118f 100644
--- a/plexapi/library.py
+++ b/plexapi/library.py
@@ -723,7 +723,7 @@ def _cleanSearchFilter(self, category, value, libtype=None):
         result = set()
         choices = self.listChoices(category, libtype)
         lookup = {c.title.lower(): unquote(unquote(c.key)) for c in choices}
-        allowed = set(c.key for c in choices)
+        allowed = {c.key for c in choices}
         for item in value:
             item = str((item.id or item.tag) if isinstance(item, media.MediaTag) else item).lower()
             # find most logical choice(s) to use in url
diff --git a/plexapi/settings.py b/plexapi/settings.py
index 8416f8718..734cc1198 100644
--- a/plexapi/settings.py
+++ b/plexapi/settings.py
@@ -44,7 +44,7 @@ def _loadData(self, data):
 
     def all(self):
         """ Returns a list of all :class:`~plexapi.settings.Setting` objects available. """
-        return list(v for id, v in sorted(self._settings.items()))
+        return [v for id, v in sorted(self._settings.items())]
 
     def get(self, id):
         """ Return the :class:`~plexapi.settings.Setting` object with the specified id. """
@@ -102,7 +102,7 @@ class Setting(PlexObject):
             group (str): Group name this setting is categorized as.
             enumValues (list,dict): List or dictionary of valis values for this setting.
     """
-    _bool_cast = lambda x: True if x == 'true' or x == '1' else False
+    _bool_cast = lambda x: bool(x == 'true' or x == '1')
     _bool_str = lambda x: str(x).lower()
     TYPES = {
         'bool': {'type': bool, 'cast': _bool_cast, 'tostr': _bool_str},
diff --git a/plexapi/utils.py b/plexapi/utils.py
index e4225941c..be07672ee 100644
--- a/plexapi/utils.py
+++ b/plexapi/utils.py
@@ -176,7 +176,7 @@ def threaded(callback, listargs):
         threads[-1].setDaemon(True)
         threads[-1].start()
     while not job_is_done_event.is_set():
-        if all([not t.is_alive() for t in threads]):
+        if all(not t.is_alive() for t in threads):
             break
         time.sleep(0.05)
 
diff --git a/tests/test_history.py b/tests/test_history.py
index af5c65fef..bc23eb1bb 100644
--- a/tests/test_history.py
+++ b/tests/test_history.py
@@ -1,10 +1,4 @@
 # -*- coding: utf-8 -*-
-from datetime import datetime
-
-import pytest
-from plexapi.exceptions import BadRequest, NotFound
-
-from . import conftest as utils
 
 
 def test_history_Movie(movie):
diff --git a/tests/test_video.py b/tests/test_video.py
index 4eba01b0d..a2e617019 100644
--- a/tests/test_video.py
+++ b/tests/test_video.py
@@ -134,7 +134,7 @@ def test_video_Movie_upload_select_remove_subtitle(movie, subtitle):
     assert subname in subtitles
 
     subtitleSelection = movie.subtitleStreams()[0]
-    parts = [part for part in movie.iterParts()]
+    parts = list(movie.iterParts())
     parts[0].setDefaultSubtitleStream(subtitleSelection)
     movie.reload()
 
diff --git a/tools/plex-backupwatched.py b/tools/plex-backupwatched.py
index 5307e3125..4cacd1160 100755
--- a/tools/plex-backupwatched.py
+++ b/tools/plex-backupwatched.py
@@ -51,7 +51,7 @@ def _iter_items(section):
 
 def backup_watched(plex, opts):
     """ Backup watched status to the specified filepath. """
-    data = defaultdict(lambda: dict())
+    data = defaultdict(lambda: {})
     for section in _iter_sections(plex, opts):
         print('Fetching watched status for %s..' % section.title)
         skey = section.title.lower()
@@ -70,7 +70,7 @@ def restore_watched(plex, opts):
     with open(opts.filepath, 'r') as handle:
         source = json.load(handle)
     # Find the differences
-    differences = defaultdict(lambda: dict())
+    differences = defaultdict(lambda: {})
     for section in _iter_sections(plex, opts):
         print('Finding differences in %s..' % section.title)
         skey = section.title.lower()