diff --git a/src/chat_control.py b/src/chat_control.py
index 747a3a67d..691f5d958 100644
--- a/src/chat_control.py
+++ b/src/chat_control.py
@@ -29,9 +29,6 @@
 
 import os
 import time
-import gi
-gi.require_version('GdkX11', '3.0')
-from gi.repository import GdkX11
 from gi.repository import Gtk
 from gi.repository import Gdk
 from gi.repository import GdkPixbuf
@@ -58,7 +55,6 @@ from message_textview import MessageTextView
 from common.stanza_session import EncryptedStanzaSession, ArchivingStanzaSession
 from common.contacts import GC_Contact
 from common.logger import constants
-from common.pep import MOODS, ACTIVITIES
 from nbxmpp.protocol import NS_XHTML, NS_XHTML_IM, NS_FILE, NS_MUC
 from nbxmpp.protocol import NS_RECEIPTS, NS_ESESSION
 from nbxmpp.protocol import NS_JINGLE_RTP_AUDIO, NS_JINGLE_RTP_VIDEO
diff --git a/src/common/caps_cache.py b/src/common/caps_cache.py
index 7108c179f..2d1ed9d2b 100644
--- a/src/common/caps_cache.py
+++ b/src/common/caps_cache.py
@@ -38,7 +38,7 @@ import logging
 log = logging.getLogger('gajim.c.caps_cache')
 
 from nbxmpp import (NS_XHTML_IM, NS_RECEIPTS, NS_ESESSION, NS_CHATSTATES,
-    NS_JINGLE_ICE_UDP, NS_JINGLE_RTP_AUDIO, NS_JINGLE_RTP_VIDEO, NS_CAPS,
+    NS_JINGLE_ICE_UDP, NS_JINGLE_RTP_AUDIO, NS_JINGLE_RTP_VIDEO,
     NS_JINGLE_FILE_TRANSFER)
 # Features where we cannot safely assume that the other side supports them
 FEATURE_BLACKLIST = [NS_CHATSTATES, NS_XHTML_IM, NS_RECEIPTS, NS_ESESSION,
diff --git a/src/common/check_paths.py b/src/common/check_paths.py
index 417d02dd3..5e92c324a 100644
--- a/src/common/check_paths.py
+++ b/src/common/check_paths.py
@@ -26,7 +26,6 @@
 import os
 import shutil
 import sys
-import stat
 
 from common import gajim
 from common import logger
diff --git a/src/common/config.py b/src/common/config.py
index 5649f8118..79368347a 100644
--- a/src/common/config.py
+++ b/src/common/config.py
@@ -32,9 +32,7 @@
 ##
 
 
-import sys
 import re
-import copy
 from common import defs
 from gi.repository import GLib
 
diff --git a/src/common/dbus_support.py b/src/common/dbus_support.py
index 87ead7f39..cd4611152 100644
--- a/src/common/dbus_support.py
+++ b/src/common/dbus_support.py
@@ -24,7 +24,7 @@
 ## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
 ##
 
-import os, sys
+import os
 
 from common import gajim
 from common import exceptions
diff --git a/src/common/fuzzyclock.py b/src/common/fuzzyclock.py
index f9a1bf328..79fded35f 100755
--- a/src/common/fuzzyclock.py
+++ b/src/common/fuzzyclock.py
@@ -32,7 +32,6 @@ in turn based on the Fuzzy Clock Applet of Frerich Raabe (KDE).
 So most of the credit goes to this guys, thanks :-)
 """
 
-import time
 
 class FuzzyClock:
     HOUR_NAMES = [ _('twelve'), _('one'), _('two'), _('three'), _('four'),
diff --git a/src/common/gajim.py b/src/common/gajim.py
index 24cfda774..f9ba812df 100644
--- a/src/common/gajim.py
+++ b/src/common/gajim.py
@@ -27,7 +27,6 @@
 ## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
 ##
 
-import sys
 import os
 import logging
 import locale
@@ -201,10 +200,6 @@ try:
     from gi.repository import Farstream
     gi.require_version('Gst', '1.0')
     from gi.repository import Gst
-    gi.require_version('GdkX11', '3.0')
-    from gi.repository import GdkX11
-    gi.require_version('GstVideo', '1.0')
-    from gi.repository import GstVideo
     from gi.repository import GLib
     try:
         Gst.init(None)
diff --git a/src/common/helpers.py b/src/common/helpers.py
index 4d3d3166c..c611c04a9 100644
--- a/src/common/helpers.py
+++ b/src/common/helpers.py
@@ -31,7 +31,6 @@
 
 import sys
 import re
-import locale
 import os
 import subprocess
 import urllib
diff --git a/src/common/jingle_rtp.py b/src/common/jingle_rtp.py
index f78d81018..c94666922 100644
--- a/src/common/jingle_rtp.py
+++ b/src/common/jingle_rtp.py
@@ -17,20 +17,13 @@
 Handles Jingle RTP sessions (XEP 0167)
 """
 
-from collections import deque
-
-from gi.repository import GLib
 import socket
-
 import nbxmpp
-from gi.repository import Farstream
 import gi
+from gi.repository import Farstream
+
 gi.require_version('Gst', '1.0')
 from gi.repository import Gst
-gi.require_version('GdkX11', '3.0')
-from gi.repository import GdkX11
-gi.require_version('GstVideo', '1.0')
-from gi.repository import GstVideo
 from gi.repository import GLib
 
 from common import gajim
@@ -40,6 +33,7 @@ from common.jingle_content import contents, JingleContent, JingleContentSetupExc
 from common.connection_handlers_events import InformationEvent
 from common.jingle_session import FailedApplication
 
+from collections import deque
 
 import logging
 log = logging.getLogger('gajim.c.jingle_rtp')
diff --git a/src/common/logging_helpers.py b/src/common/logging_helpers.py
index ec5dfe70d..7922b8dab 100644
--- a/src/common/logging_helpers.py
+++ b/src/common/logging_helpers.py
@@ -19,7 +19,6 @@
 ##
 
 import logging
-from common import i18n
 
 def parseLogLevel(arg):
     """
diff --git a/src/common/multimedia_helpers.py b/src/common/multimedia_helpers.py
index 910c00d93..c41ceed52 100644
--- a/src/common/multimedia_helpers.py
+++ b/src/common/multimedia_helpers.py
@@ -16,10 +16,6 @@
 import gi
 gi.require_version('Gst', '1.0')
 from gi.repository import Gst
-gi.require_version('GdkX11', '3.0')
-from gi.repository import GdkX11
-gi.require_version('GstVideo', '1.0')
-from gi.repository import GstVideo
 
 
 class DeviceManager(object):
diff --git a/src/common/optparser.py b/src/common/optparser.py
index e11bd3a38..4bfed3e2e 100644
--- a/src/common/optparser.py
+++ b/src/common/optparser.py
@@ -28,7 +28,6 @@
 
 import os
 import sys
-import locale
 import re
 from time import time
 from common import gajim
diff --git a/src/common/resolver.py b/src/common/resolver.py
index 6b3940aeb..736463655 100644
--- a/src/common/resolver.py
+++ b/src/common/resolver.py
@@ -18,8 +18,6 @@
 ##
 
 import sys
-import os
-import re
 import logging
 import functools
 log = logging.getLogger('gajim.c.resolver')
@@ -30,8 +28,6 @@ if __name__ == '__main__':
     import common.configpaths
     common.configpaths.gajimpaths.init(None)
 
-from common import helpers
-from nbxmpp.idlequeue import IdleCommand
 from gi.repository import Gio, GLib
 
 
@@ -132,7 +128,6 @@ class GioResolver(CommonResolver):
 
 # below lines is on how to use API and assist in testing
 if __name__ == '__main__':
-    from gi.repository import GLib
     from gi.repository import Gtk
     from nbxmpp import idlequeue
 
diff --git a/src/common/sleepy.py b/src/common/sleepy.py
index b7c437d7d..ca1a34d3e 100644
--- a/src/common/sleepy.py
+++ b/src/common/sleepy.py
@@ -23,7 +23,6 @@
 
 from common import gajim
 import os
-import sys
 
 
 STATE_UNKNOWN  = 'OS probably not supported'
diff --git a/src/config.py b/src/config.py
index 5885e15a3..53339c4a4 100644
--- a/src/config.py
+++ b/src/config.py
@@ -36,7 +36,7 @@ from gi.repository import Gdk
 from gi.repository import Pango
 from gi.repository import GObject
 from gi.repository import GLib
-import os, sys
+import os
 import common.config
 import common.sleepy
 from common.i18n import Q_
diff --git a/src/conversation_textview.py b/src/conversation_textview.py
index cdaedd47b..fd34bd049 100644
--- a/src/conversation_textview.py
+++ b/src/conversation_textview.py
@@ -39,7 +39,6 @@ import time
 import os
 import tooltips
 import dialogs
-import locale
 import queue
 import urllib
 
diff --git a/src/dialogs.py b/src/dialogs.py
index 05cfae0ac..e85749ca5 100644
--- a/src/dialogs.py
+++ b/src/dialogs.py
@@ -42,7 +42,6 @@ import time
 import gtkgui_helpers
 import vcard
 import conversation_textview
-import message_control
 import dataforms_widget
 
 from common import defs
diff --git a/src/disco.py b/src/disco.py
index 51871b4e0..3519a3af5 100644
--- a/src/disco.py
+++ b/src/disco.py
@@ -44,7 +44,6 @@
 # the functionality)
 # There are more methods, of course, but this is a basic set.
 
-import os
 import types
 import weakref
 from gi.repository import GLib
diff --git a/src/features_window.py b/src/features_window.py
index 23df54467..19ef8b3fc 100644
--- a/src/features_window.py
+++ b/src/features_window.py
@@ -24,7 +24,6 @@
 ##
 
 import os
-import sys
 import gi
 from gi.repository import Gtk
 import gtkgui_helpers
diff --git a/src/gtkgui_helpers.py b/src/gtkgui_helpers.py
index 4499a0158..643cfd052 100644
--- a/src/gtkgui_helpers.py
+++ b/src/gtkgui_helpers.py
@@ -36,13 +36,11 @@ from gi.repository import GLib
 from gi.repository import Pango
 import os
 import sys
-import importlib
 try:
     from PIL import Image
 except:
     pass
 from io import BytesIO
-import array
 
 import logging
 log = logging.getLogger('gajim.gtkgui_helpers')
diff --git a/src/history_manager.py b/src/history_manager.py
index b99e0f158..b32935b5f 100644
--- a/src/history_manager.py
+++ b/src/history_manager.py
@@ -52,7 +52,6 @@ import signal
 import gi
 gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk
-gi.require_version('GdkX11', '3.0')
 from gi.repository import Gdk
 from gi.repository import GLib
 import time
diff --git a/src/htmltextview.py b/src/htmltextview.py
index 31e8f67a0..decd31076 100644
--- a/src/htmltextview.py
+++ b/src/htmltextview.py
@@ -41,11 +41,11 @@ from gi.repository import Pango
 from gi.repository import Gtk
 from gi.repository import Gdk
 from gi.repository import GdkPixbuf
-import xml.sax, xml.sax.handler
+import xml.sax
+import xml.sax.handler
 import re
 from io import StringIO
 import urllib
-import operator
 
 if __name__ == '__main__':
     from common import i18n
diff --git a/src/message_textview.py b/src/message_textview.py
index e266830f5..eb253da97 100644
--- a/src/message_textview.py
+++ b/src/message_textview.py
@@ -24,12 +24,10 @@
 import gc
 
 from gi.repository import Gtk
-from gi.repository import Gdk
 from gi.repository import GObject
 from gi.repository import GLib
 from gi.repository import Pango
 
-import gtkgui_helpers
 from common import gajim
 
 class MessageTextView(Gtk.TextView):
diff --git a/src/network_manager_listener.py b/src/network_manager_listener.py
index 225fc9ad9..ff5e8a27c 100644
--- a/src/network_manager_listener.py
+++ b/src/network_manager_listener.py
@@ -21,7 +21,6 @@
 ## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
 ##
 
-import sys
 from common import gajim
 
 
diff --git a/src/notify.py b/src/notify.py
index 1e1c9f0e1..72066bccb 100644
--- a/src/notify.py
+++ b/src/notify.py
@@ -33,7 +33,6 @@ from dialogs import PopupNotificationWindow
 from gi.repository import GObject
 from gi.repository import GLib
 import gtkgui_helpers
-from gi.repository import Gtk
 
 from common import gajim
 from common import helpers
diff --git a/src/roster_window.py b/src/roster_window.py
index aa8cbfe41..b4427a4ef 100644
--- a/src/roster_window.py
+++ b/src/roster_window.py
@@ -74,7 +74,6 @@ if dbus_support.supported:
     import dbus
 
 from nbxmpp.protocol import NS_FILE, NS_ROSTERX, NS_CONFERENCE
-from common.pep import MOODS, ACTIVITIES
 
 #(icon, name, type, jid, account, editable, second pixbuf)
 (
diff --git a/src/statusicon.py b/src/statusicon.py
index a7a1292d5..fb452a9aa 100644
--- a/src/statusicon.py
+++ b/src/statusicon.py
@@ -23,7 +23,6 @@
 ## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
 ##
 
-import sys
 from gi.repository import Gtk
 from gi.repository import Gdk
 from gi.repository import GObject
@@ -33,7 +32,6 @@ import dialogs
 import config
 import tooltips
 import gtkgui_helpers
-import tooltips
 
 from common import gajim
 from common import helpers
diff --git a/src/tooltips.py b/src/tooltips.py
index fadb4dfb6..2cb8fa6bc 100644
--- a/src/tooltips.py
+++ b/src/tooltips.py
@@ -33,7 +33,6 @@ from gi.repository import Gdk
 from gi.repository import GLib
 import os
 import time
-import locale
 from datetime import datetime
 from datetime import timedelta