diff --git a/bin/gpodder b/bin/gpodder
index 3e9b3ed9..a070a1b1 100755
--- a/bin/gpodder
+++ b/bin/gpodder
@@ -39,7 +39,6 @@ logger = logging.getLogger(__name__)
 
 try:
     import dbus
-    from dbus.mainloop.glib import DBusGMainLoop
     have_dbus = True
 except ImportError:
     print("""
diff --git a/bin/gpodder-migrate2tres b/bin/gpodder-migrate2tres
index e300e151..e3aaddaa 100755
--- a/bin/gpodder-migrate2tres
+++ b/bin/gpodder-migrate2tres
@@ -26,7 +26,6 @@
 
 import configparser
 import os
-import re
 import shutil
 import sys
 
diff --git a/setup.py b/setup.py
index f42a07c9..050be572 100644
--- a/setup.py
+++ b/setup.py
@@ -18,7 +18,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-import glob
 import os
 import re
 import sys
diff --git a/share/gpodder/extensions/command_on_download.py b/share/gpodder/extensions/command_on_download.py
index 51374d9c..4ce2d1b8 100644
--- a/share/gpodder/extensions/command_on_download.py
+++ b/share/gpodder/extensions/command_on_download.py
@@ -6,7 +6,6 @@
 import datetime
 import logging
 import os
-import subprocess
 
 import gpodder
 from gpodder import util
diff --git a/share/gpodder/extensions/concatenate_videos.py b/share/gpodder/extensions/concatenate_videos.py
index 34561621..3167854d 100644
--- a/share/gpodder/extensions/concatenate_videos.py
+++ b/share/gpodder/extensions/concatenate_videos.py
@@ -5,7 +5,6 @@
 
 import logging
 import os
-import subprocess
 
 from gi.repository import Gtk
 
diff --git a/share/gpodder/extensions/enqueue_in_mediaplayer.py b/share/gpodder/extensions/enqueue_in_mediaplayer.py
index d8ad66ff..5673ae87 100644
--- a/share/gpodder/extensions/enqueue_in_mediaplayer.py
+++ b/share/gpodder/extensions/enqueue_in_mediaplayer.py
@@ -5,7 +5,6 @@
 # Released under the same license terms as gPodder itself.
 import functools
 import logging
-import subprocess
 
 import gpodder
 from gpodder import util
diff --git a/share/gpodder/extensions/notification-win32.py b/share/gpodder/extensions/notification-win32.py
index d1d8151c..c99f3796 100644
--- a/share/gpodder/extensions/notification-win32.py
+++ b/share/gpodder/extensions/notification-win32.py
@@ -44,11 +44,6 @@ import tempfile
 
 import gpodder
 
-import gi  # isort:skip
-gi.require_version('Gtk', '3.0')  # isort:skip
-from gi.repository import Gtk  # isort:skip
-
-
 logger = logging.getLogger(__name__)
 _ = gpodder.gettext
 
diff --git a/share/gpodder/extensions/tagging.py b/share/gpodder/extensions/tagging.py
index 0e0697c4..bfcd6d04 100644
--- a/share/gpodder/extensions/tagging.py
+++ b/share/gpodder/extensions/tagging.py
@@ -26,7 +26,6 @@ import base64
 import datetime
 import logging
 import mimetypes
-import os
 
 from mutagen import File
 from mutagen.easyid3 import EasyID3
diff --git a/share/gpodder/extensions/taskbar_progress.py b/share/gpodder/extensions/taskbar_progress.py
index 63195ffa..93d56f78 100644
--- a/share/gpodder/extensions/taskbar_progress.py
+++ b/share/gpodder/extensions/taskbar_progress.py
@@ -32,6 +32,7 @@ from comtypes import COMMETHOD, GUID, IUnknown, client, wireHWND
 import gpodder
 
 import gi  # isort:skip
+gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk  # isort:skip
 
 
diff --git a/share/gpodder/extensions/ubuntu_unity.py b/share/gpodder/extensions/ubuntu_unity.py
index ffe12162..22b8dbfb 100644
--- a/share/gpodder/extensions/ubuntu_unity.py
+++ b/share/gpodder/extensions/ubuntu_unity.py
@@ -4,12 +4,8 @@
 # Thomas Perl <thp@gpodder.org>; 2012-02-06
 
 import logging
-import os
-import subprocess
-import sys
 
 import gpodder
-from gpodder import util
 
 import gi  # isort:skip
 gi.require_version('Unity', '7.0')  # isort:skip
diff --git a/share/gpodder/extensions/video_converter.py b/share/gpodder/extensions/video_converter.py
index 363bc34f..d1230e9f 100644
--- a/share/gpodder/extensions/video_converter.py
+++ b/share/gpodder/extensions/video_converter.py
@@ -11,7 +11,7 @@ import os
 import subprocess
 
 import gpodder
-from gpodder import util, youtube
+from gpodder import util
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/gpodder/dbsqlite.py b/src/gpodder/dbsqlite.py
index 94fc17a8..c6f7686c 100644
--- a/src/gpodder/dbsqlite.py
+++ b/src/gpodder/dbsqlite.py
@@ -25,8 +25,6 @@
 #
 
 import logging
-import re
-import sys
 import threading
 from sqlite3 import dbapi2 as sqlite
 
diff --git a/src/gpodder/directory.py b/src/gpodder/directory.py
index b092e03f..e2ff7091 100644
--- a/src/gpodder/directory.py
+++ b/src/gpodder/directory.py
@@ -23,8 +23,6 @@
 # Thomas Perl <thp@gpodder.org>; 2014-10-22
 #
 
-import json
-import os
 import urllib.error
 import urllib.parse
 import urllib.request
diff --git a/src/gpodder/download.py b/src/gpodder/download.py
index f26a5d80..fa6323ab 100644
--- a/src/gpodder/download.py
+++ b/src/gpodder/download.py
@@ -25,15 +25,12 @@
 #  Based on libwget.py (2005-10-29)
 #
 
-import collections
-import email
 import glob
 import logging
 import mimetypes
 import os
 import os.path
 import shutil
-import socket
 import threading
 import time
 import urllib.error
diff --git a/src/gpodder/extensions.py b/src/gpodder/extensions.py
index 0509387d..d7e8e666 100644
--- a/src/gpodder/extensions.py
+++ b/src/gpodder/extensions.py
@@ -32,15 +32,9 @@ For an example extension see share/gpodder/examples/extensions.py
 import functools
 import glob
 import imp
-import inspect
-import json
 import logging
 import os
 import re
-import shlex
-import subprocess
-import sys
-from datetime import datetime
 
 import gpodder
 from gpodder import util
@@ -414,7 +408,6 @@ class ExtensionManager(object):
         @param update_podcast_callback: Function to update a podcast feed
         @param download_episode_callback: Function to download an episode
         """
-        pass
 
     @call_extensions
     def on_podcast_subscribe(self, podcast):
@@ -422,7 +415,6 @@ class ExtensionManager(object):
 
         @param podcast: A gpodder.model.PodcastChannel instance
         """
-        pass
 
     @call_extensions
     def on_podcast_updated(self, podcast):
@@ -432,7 +424,6 @@ class ExtensionManager(object):
 
         @param podcast: A gpodder.model.PodcastChannel instance
         """
-        pass
 
     @call_extensions
     def on_podcast_update_failed(self, podcast, exception):
@@ -442,7 +433,6 @@ class ExtensionManager(object):
 
         @param exception: The reason.
         """
-        pass
 
     @call_extensions
     def on_podcast_save(self, podcast):
@@ -453,7 +443,6 @@ class ExtensionManager(object):
 
         @param podcast: A gpodder.model.PodcastChannel instance
         """
-        pass
 
     @call_extensions
     def on_podcast_delete(self, podcast):
@@ -461,7 +450,6 @@ class ExtensionManager(object):
 
         @param podcast: A gpodder.model.PodcastChannel instance
         """
-        pass
 
     @call_extensions
     def on_episode_playback(self, episode):
@@ -472,7 +460,6 @@ class ExtensionManager(object):
 
         @param episode: A gpodder.model.PodcastEpisode instance
         """
-        pass
 
     @call_extensions
     def on_episode_save(self, episode):
@@ -483,7 +470,6 @@ class ExtensionManager(object):
 
         @param episode: A gpodder.model.PodcastEpisode instance
         """
-        pass
 
     @call_extensions
     def on_episode_downloaded(self, episode):
@@ -493,13 +479,11 @@ class ExtensionManager(object):
 
         @param episode: A gpodder.model.PodcastEpisode instance
         """
-        pass
 
     @call_extensions
     def on_all_episodes_downloaded(self):
         """Called when all episodes has been downloaded
         """
-        pass
 
     @call_extensions
     def on_episode_synced(self, device, episode):
@@ -515,7 +499,6 @@ class ExtensionManager(object):
         @param device: A gpodder.sync.Device instance
         @param episode: A gpodder.model.PodcastEpisode instance
         """
-        pass
 
     @call_extensions
     def on_create_menu(self):
@@ -529,7 +512,6 @@ class ExtensionManager(object):
 
         [('Sync to Smartphone', lambda : ...)]
         """
-        pass
 
     @call_extensions
     def on_episodes_context_menu(self, episodes):
@@ -546,7 +528,6 @@ class ExtensionManager(object):
 
         @param episodes: A list of gpodder.model.PodcastEpisode instances
         """
-        pass
 
     @call_extensions
     def on_channel_context_menu(self, channel):
@@ -561,13 +542,11 @@ class ExtensionManager(object):
         [('Update channel', lambda channel: ...)]
         @param channel: A gpodder.model.PodcastChannel instance
         """
-        pass
 
     @call_extensions
     def on_episode_delete(self, episode, filename):
         """Called just before the episode's disk file is about to be
         deleted."""
-        pass
 
     @call_extensions
     def on_episode_removed_from_podcast(self, episode):
@@ -577,7 +556,6 @@ class ExtensionManager(object):
 
         @param podcast: A gpodder.model.PodcastChannel instance
         """
-        pass
 
     @call_extensions
     def on_notification_show(self, title, message):
@@ -586,7 +564,6 @@ class ExtensionManager(object):
         @param title: title of the notification
         @param message: message of the notification
         """
-        pass
 
     @call_extensions
     def on_download_progress(self, progress):
@@ -594,7 +571,6 @@ class ExtensionManager(object):
 
         @param progress: The current progress value (0..1)
         """
-        pass
 
     @call_extensions
     def on_ui_object_available(self, name, ui_object):
@@ -606,7 +582,6 @@ class ExtensionManager(object):
         @param name: The name/ID of the object
         @param ui_object: The object itself
         """
-        pass
 
     @call_extensions
     def on_application_started(self):
@@ -619,7 +594,6 @@ class ExtensionManager(object):
 
         It is called after on_ui_object_available and on_ui_initialized.
         """
-        pass
 
     @call_extensions
     def on_find_partial_downloads_done(self):
@@ -630,7 +604,6 @@ class ExtensionManager(object):
 
         It is called after on_application_started.
         """
-        pass
 
     @call_extensions
     def on_preferences(self):
@@ -644,7 +617,6 @@ class ExtensionManager(object):
 
         [('Tab name', lambda: ...)]
         """
-        pass
 
     @call_extensions
     def on_channel_settings(self, channel):
@@ -661,4 +633,3 @@ class ExtensionManager(object):
 
         @param channel: A gpodder.model.PodcastChannel instance
         """
-        pass
diff --git a/src/gpodder/feedcore.py b/src/gpodder/feedcore.py
index 2563aa32..c8457965 100644
--- a/src/gpodder/feedcore.py
+++ b/src/gpodder/feedcore.py
@@ -27,8 +27,6 @@ import urllib.parse
 from html.parser import HTMLParser
 from io import BytesIO
 
-from requests.exceptions import RequestException
-
 from gpodder import util, youtube
 
 logger = logging.getLogger(__name__)
diff --git a/src/gpodder/gtkui/base.py b/src/gpodder/gtkui/base.py
index b1f91fbe..25cf3f3e 100644
--- a/src/gpodder/gtkui/base.py
+++ b/src/gpodder/gtkui/base.py
@@ -22,7 +22,6 @@ Based on SimpleGladeApp.py Copyright (C) 2004 Sandino Flores Moreno
 
 import os
 import re
-import sys
 import tokenize
 
 from gi.repository import Gtk
@@ -103,7 +102,6 @@ class GtkBuilderWidget(object):
         Method called when the user interface is loaded and ready to be used.
         At this moment, the widgets are loaded and can be refered as self.widget_name
         """
-        pass
 
     def main(self):
         """
@@ -149,4 +147,3 @@ class GtkBuilderWidget(object):
         This method is called by the default implementation of run()
         after a program is finished by pressing Control-C.
         """
-        pass
diff --git a/src/gpodder/gtkui/desktop/exportlocal.py b/src/gpodder/gtkui/desktop/exportlocal.py
index 973b21aa..3f8f96f9 100644
--- a/src/gpodder/gtkui/desktop/exportlocal.py
+++ b/src/gpodder/gtkui/desktop/exportlocal.py
@@ -18,10 +18,7 @@
 #
 import os
 
-from gi.repository import Gtk, Pango
-
 import gpodder
-from gpodder import util
 from gpodder.gtkui.interface.common import BuilderWidget
 
 _ = gpodder.gettext
diff --git a/src/gpodder/gtkui/desktop/preferences.py b/src/gpodder/gtkui/desktop/preferences.py
index b19108ef..edbb16e1 100644
--- a/src/gpodder/gtkui/desktop/preferences.py
+++ b/src/gpodder/gtkui/desktop/preferences.py
@@ -19,7 +19,6 @@
 
 import html
 import logging
-import urllib.parse
 
 from gi.repository import Gdk, Gtk, Pango
 
diff --git a/src/gpodder/gtkui/desktopfile.py b/src/gpodder/gtkui/desktopfile.py
index 3b937083..19ba597d 100644
--- a/src/gpodder/gtkui/desktopfile.py
+++ b/src/gpodder/gtkui/desktopfile.py
@@ -169,7 +169,6 @@ class UserAppsReader(object):
 
         self.__has_read = True
         if gpodder.ui.win32:
-            import winreg
             for caption, types, hkey in WIN32_APP_REG_KEYS:
                 try:
                     cmdline = win32_read_registry_key(hkey)
diff --git a/src/gpodder/gtkui/draw.py b/src/gpodder/gtkui/draw.py
index 7a97f19b..f6afa428 100644
--- a/src/gpodder/gtkui/draw.py
+++ b/src/gpodder/gtkui/draw.py
@@ -28,8 +28,6 @@ import math
 
 import cairo
 
-import gpodder
-
 import gi  # isort:skip
 gi.require_version('Gdk', '3.0')  # isort:skip
 gi.require_version('Gtk', '3.0')  # isort:skip
diff --git a/src/gpodder/gtkui/interface/common.py b/src/gpodder/gtkui/interface/common.py
index 48889f27..17adafe9 100644
--- a/src/gpodder/gtkui/interface/common.py
+++ b/src/gpodder/gtkui/interface/common.py
@@ -18,7 +18,6 @@
 #
 
 import os
-import shutil
 
 from gi.repository import Gdk, Gtk
 
diff --git a/src/gpodder/gtkui/main.py b/src/gpodder/gtkui/main.py
index 19514007..7a00279c 100644
--- a/src/gpodder/gtkui/main.py
+++ b/src/gpodder/gtkui/main.py
@@ -34,8 +34,7 @@ import requests.exceptions
 import urllib3.exceptions
 
 import gpodder
-from gpodder import (common, download, extensions, feedcore, my, opml, player,
-                     util, youtube)
+from gpodder import common, download, feedcore, my, opml, player, util, youtube
 from gpodder.dbusproxy import DBusPodcastsProxy
 from gpodder.model import Model, PodcastEpisode
 from gpodder.syncui import gPodderSyncUI
@@ -59,7 +58,7 @@ from .services import CoverDownloader
 
 import gi  # isort:skip
 gi.require_version('Gtk', '3.0')  # isort:skip
-from gi.repository import Gdk, GdkPixbuf, Gio, GLib, Gtk, Pango  # isort:skip
+from gi.repository import Gdk, Gio, GLib, Gtk, Pango  # isort:skip
 
 
 logger = logging.getLogger(__name__)
diff --git a/src/gpodder/gtkui/services.py b/src/gpodder/gtkui/services.py
index 2147c6ff..8ac25465 100644
--- a/src/gpodder/gtkui/services.py
+++ b/src/gpodder/gtkui/services.py
@@ -25,7 +25,7 @@
 
 import logging
 
-from gi.repository import GdkPixbuf, Gtk
+from gi.repository import GdkPixbuf
 
 import gpodder
 from gpodder import coverart, util
diff --git a/src/gpodder/gtkui/shownotes.py b/src/gpodder/gtkui/shownotes.py
index a08aa975..a906e835 100644
--- a/src/gpodder/gtkui/shownotes.py
+++ b/src/gpodder/gtkui/shownotes.py
@@ -18,7 +18,6 @@
 #
 import html
 import logging
-import re
 from urllib.parse import urlparse
 
 import gpodder
diff --git a/src/gpodder/gtkui/widgets.py b/src/gpodder/gtkui/widgets.py
index 9ff30f1e..70f7e2dc 100644
--- a/src/gpodder/gtkui/widgets.py
+++ b/src/gpodder/gtkui/widgets.py
@@ -23,9 +23,8 @@
 #  Thomas Perl <thp@gpodder.org> 2009-03-31
 #
 
-import html
 
-from gi.repository import Gdk, GObject, Gtk, Pango
+from gi.repository import Gtk
 
 
 class SpinningProgressIndicator(Gtk.Image):
diff --git a/src/gpodder/libgpod_ctypes.py b/src/gpodder/libgpod_ctypes.py
index f900c580..f0ee9219 100644
--- a/src/gpodder/libgpod_ctypes.py
+++ b/src/gpodder/libgpod_ctypes.py
@@ -28,7 +28,6 @@
 import ctypes
 import logging
 import os
-import struct
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/gpodder/model.py b/src/gpodder/model.py
index 3f3447c2..a3290383 100644
--- a/src/gpodder/model.py
+++ b/src/gpodder/model.py
@@ -24,7 +24,6 @@
 #  Based on libpodcasts.py (thp, 2005-10-29)
 #
 
-import collections
 import datetime
 import glob
 import hashlib
diff --git a/src/gpodder/opml.py b/src/gpodder/opml.py
index 75e69df4..d7e03d16 100644
--- a/src/gpodder/opml.py
+++ b/src/gpodder/opml.py
@@ -38,7 +38,6 @@ import io
 import logging
 import os
 import os.path
-import shutil
 import xml.dom.minidom
 from email.utils import formatdate
 
diff --git a/src/gpodder/plugins/soundcloud.py b/src/gpodder/plugins/soundcloud.py
index 831f0538..c4fef651 100644
--- a/src/gpodder/plugins/soundcloud.py
+++ b/src/gpodder/plugins/soundcloud.py
@@ -20,7 +20,6 @@
 # Soundcloud.com API client module for gPodder
 # Thomas Perl <thp@gpodder.org>; 2009-11-03
 
-import email
 import json
 import logging
 import os
diff --git a/src/gpodder/sync.py b/src/gpodder/sync.py
index d75e859e..20b6610b 100644
--- a/src/gpodder/sync.py
+++ b/src/gpodder/sync.py
@@ -23,15 +23,10 @@
 # based on libipodsync.py (2006-04-05 Thomas Perl)
 # Ported to gPodder 3 by Joseph Wickremasinghe in June 2012
 
-import calendar
-import glob
 import logging
 import os.path
 import threading
 import time
-from enum import Enum
-from re import S
-from urllib.parse import urlparse
 
 import gpodder
 from gpodder import download, services, util
diff --git a/src/gpodder/syncui.py b/src/gpodder/syncui.py
index 04ce0741..b5ef8f71 100644
--- a/src/gpodder/syncui.py
+++ b/src/gpodder/syncui.py
@@ -22,7 +22,6 @@
 # Ported to gPodder 3 by Joseph Wickremasinghe in June 2012
 
 import logging
-import os
 
 import gpodder
 from gpodder import sync, util
diff --git a/src/gpodder/util.py b/src/gpodder/util.py
index 936a2901..3604ab49 100644
--- a/src/gpodder/util.py
+++ b/src/gpodder/util.py
@@ -33,11 +33,8 @@ import collections
 import datetime
 import email
 import glob
-import gzip
 import http.client
-import io
 import itertools
-import json
 import locale
 import logging
 import mimetypes
@@ -57,7 +54,6 @@ import time
 import urllib.error
 import urllib.parse
 import webbrowser
-import xml.dom.minidom
 from html.entities import entitydefs, name2codepoint
 from html.parser import HTMLParser
 
@@ -2373,7 +2369,6 @@ def mount_volume_for_file(file, op=None):
 
 
 def scale_pixbuf(pixbuf, max):
-    import gi
     from gi.repository import GdkPixbuf
 
     w_cur = pixbuf.get_width()
diff --git a/src/gpodder/utilwin32ctypes.py b/src/gpodder/utilwin32ctypes.py
index 3e5ded3c..ca6d48f6 100644
--- a/src/gpodder/utilwin32ctypes.py
+++ b/src/gpodder/utilwin32ctypes.py
@@ -20,7 +20,7 @@
 
 import ctypes
 from ctypes import HRESULT, Structure, byref, c_ulonglong
-from ctypes.wintypes import (BOOL, BYTE, DWORD, HANDLE, LPCWSTR, MAX_PATH,
+from ctypes.wintypes import (BOOL, BYTE, DWORD, HANDLE, LPCWSTR,
                              PULARGE_INTEGER, WORD)
 from uuid import UUID
 
diff --git a/src/gpodder/vimeo.py b/src/gpodder/vimeo.py
index bf181b83..ad15e25f 100644
--- a/src/gpodder/vimeo.py
+++ b/src/gpodder/vimeo.py
@@ -23,7 +23,6 @@
 #
 
 
-import json
 import logging
 import re
 
diff --git a/tests/model.py b/tests/model.py
index a3468eec..149e7a22 100644
--- a/tests/model.py
+++ b/tests/model.py
@@ -23,7 +23,6 @@
 
 import unittest
 
-import gpodder
 from gpodder import model
 
 
diff --git a/tests/test_feedcore.py b/tests/test_feedcore.py
index 13402424..b7c70ac7 100644
--- a/tests/test_feedcore.py
+++ b/tests/test_feedcore.py
@@ -21,7 +21,7 @@ import io
 import pytest
 import requests.exceptions
 
-from gpodder.feedcore import Fetcher, Result, NEW_LOCATION, NOT_MODIFIED, UPDATED_FEED
+from gpodder.feedcore import Fetcher, NEW_LOCATION, Result, UPDATED_FEED
 
 
 class MyFetcher(Fetcher):
diff --git a/tools/create-desktop-icon.py b/tools/create-desktop-icon.py
index 4f539316..67b383b5 100755
--- a/tools/create-desktop-icon.py
+++ b/tools/create-desktop-icon.py
@@ -5,7 +5,6 @@
 import os
 import sys
 
-import gi
 from gi.repository import GLib
 
 BASE = os.path.normpath(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
diff --git a/tools/fake-dbus-module/dbus/__init__.py b/tools/fake-dbus-module/dbus/__init__.py
index ee0190c4..0058585c 100644
--- a/tools/fake-dbus-module/dbus/__init__.py
+++ b/tools/fake-dbus-module/dbus/__init__.py
@@ -1,10 +1,9 @@
-import dbus.exceptions
+import dbus.exceptions  # noqa: F401
 
 
 class SessionBus(object):
     def __init__(self, *args, **kwargs):
         self.fake = True
-        pass
 
     def add_signal_receiver(self, *args, **kwargs):
         pass
diff --git a/tools/i18n/summary.py b/tools/i18n/summary.py
index 1f5a4ca0..851828d5 100755
--- a/tools/i18n/summary.py
+++ b/tools/i18n/summary.py
@@ -10,7 +10,6 @@ import math
 import os
 import re
 import subprocess
-import sys
 
 width = 40
 
diff --git a/tools/mac-osx/launcher.py b/tools/mac-osx/launcher.py
index e86ab2af..9c9fce50 100755
--- a/tools/mac-osx/launcher.py
+++ b/tools/mac-osx/launcher.py
@@ -7,7 +7,7 @@ import subprocess
 import sys
 import time
 import traceback
-from os.path import dirname, expanduser, join
+from os.path import join
 from subprocess import PIPE, CalledProcessError, Popen