diff --git a/GTG/core/base_store.py b/GTG/core/base_store.py
index 30971b8a22..e4c070de11 100644
--- a/GTG/core/base_store.py
+++ b/GTG/core/base_store.py
@@ -25,7 +25,7 @@
 import logging
 
 from lxml.etree import _Element
-from typing import Any, Dict, List, Optional, TypeVar, Generic, Protocol
+from typing import Dict, List, Optional, TypeVar, Generic, Protocol
 
 
 log = logging.getLogger(__name__)
diff --git a/GTG/core/clipboard.py b/GTG/core/clipboard.py
index 2eefb09f9d..a2d76a5702 100644
--- a/GTG/core/clipboard.py
+++ b/GTG/core/clipboard.py
@@ -56,7 +56,6 @@ def copy(self, start, stop, bullet=None):
                 if hasattr(ta, 'is_subtask'):
                     is_subtask = True
                     tid = ta.child
-                    tas = self.ds.tasks.lookup[tid]
                     self.content.append(['subtask', tid])
             if not is_subtask:
                 if end_line.get_line() < stop.get_line():
diff --git a/GTG/core/config.py b/GTG/core/config.py
index af7fe55174..197e56c448 100644
--- a/GTG/core/config.py
+++ b/GTG/core/config.py
@@ -138,9 +138,9 @@ def _type_function(self, default_value):
         default_type = type(default_value)
         if default_type in (list, tuple):
             return self._getlist
-        elif default_type == int:
+        elif default_type is int:
             return self._section.getint
-        elif default_type == bool:
+        elif default_type is bool:
             return self._section.getboolean
         else:
             return self._section.get
diff --git a/GTG/core/tags.py b/GTG/core/tags.py
index 2eeb69d9e4..2d5915ac48 100644
--- a/GTG/core/tags.py
+++ b/GTG/core/tags.py
@@ -27,7 +27,7 @@
 import re
 
 from lxml.etree import Element, SubElement, _Element
-from typing import Any, Dict, List, Set, Optional
+from typing import Dict, List, Set, Optional
 
 from GTG.core.base_store import BaseStore
 
@@ -379,7 +379,8 @@ def add(self, item: Tag, parent_id: Optional[UUID] = None) -> None:
             self.model.append(item)
 
         self.emit('added', item)
-        if parent_id: self.lookup[parent_id].notify('children_count')
+        if parent_id:
+            self.lookup[parent_id].notify('children_count')
 
 
     def parent(self, item_id: UUID, parent_id: UUID) -> None:
@@ -388,7 +389,8 @@ def parent(self, item_id: UUID, parent_id: UUID) -> None:
         item = self.lookup[item_id]
         pos = self.model.find(item)
         self.model.remove(pos[1])
-        if parent_id: self.lookup[parent_id].notify('children_count')
+        if parent_id:
+            self.lookup[parent_id].notify('children_count')
 
 
 
@@ -397,4 +399,5 @@ def unparent(self, item_id: UUID, parent_id: UUID) -> None:
         super().unparent(item_id, parent_id)
         item = self.lookup[item_id]
         self.model.append(item)
-        if parent_id: self.lookup[parent_id].notify('children_count')
+        if parent_id:
+            self.lookup[parent_id].notify('children_count')
diff --git a/GTG/core/tasks.py b/GTG/core/tasks.py
index 66eecf253c..0ab9cee8cb 100644
--- a/GTG/core/tasks.py
+++ b/GTG/core/tasks.py
@@ -935,7 +935,8 @@ def _remove_from_parent_model(self,task_id: UUID) -> None:
             return
         model = self.tid_to_subtask_model[item.parent.id]
         pos = model.find(item)
-        if pos[0]: model.remove(pos[1])
+        if pos[0]:
+            model.remove(pos[1])
 
 
     def _append_to_parent_model(self,task_id: UUID) -> None:
@@ -950,7 +951,8 @@ def _append_to_parent_model(self,task_id: UUID) -> None:
             return
         model = self.tid_to_subtask_model[item.parent.id]
         pos = model.find(item)
-        if not pos[0]: model.append(item)
+        if not pos[0]:
+            model.append(item)
 
 
     def add(self, item: Any, parent_id: Optional[UUID] = None) -> None:
diff --git a/GTG/gtk/backends/parameters_ui/__init__.py b/GTG/gtk/backends/parameters_ui/__init__.py
index 58339113a8..025e331731 100644
--- a/GTG/gtk/backends/parameters_ui/__init__.py
+++ b/GTG/gtk/backends/parameters_ui/__init__.py
@@ -23,8 +23,6 @@
 server and client
 """
 
-import functools
-
 from gi.repository import Gtk
 
 from GTG.backends.generic_backend import GenericBackend
diff --git a/GTG/gtk/browser/adaptive_button.py b/GTG/gtk/browser/adaptive_button.py
index 7340dc2ee4..0252db6883 100644
--- a/GTG/gtk/browser/adaptive_button.py
+++ b/GTG/gtk/browser/adaptive_button.py
@@ -41,10 +41,10 @@ class ChildItem:
         """The natural height the widget claims to have"""
 
     def __init__(self, *args, **kwargs):
-        self._children: List[ChildItem] = []
+        self._children: List[self.ChildItem] = []
         """Child widgets to consider together with internal bookkeeping data"""
 
-        self._child_to_draw: Optional[ChildItem] = None
+        self._child_to_draw: Optional[self.ChildItem] = None
         """Current child to draw"""
 
         self._draw_smallest_child_if_smaller: bool = True
diff --git a/GTG/gtk/browser/main_window.py b/GTG/gtk/browser/main_window.py
index 0b983a6395..5439d24aa1 100644
--- a/GTG/gtk/browser/main_window.py
+++ b/GTG/gtk/browser/main_window.py
@@ -928,7 +928,6 @@ def on_tag_treeview_key_press_event(self, controller, keyval, keycode, state):
                 selected_tag = self.req.get_tag(selected_tags[0])
                 self.tagpopup.set_tag(selected_tag)
                 model, titer = self.tagtreeview.get_selection().get_selected()
-                rect = self.tagtreeview.get_cell_area(model.get_path(titer), None)
                 self.show_popup_at_tree_cursor(self.tagpopup, self.tagtreeview)
             else:
                 self.reset_cursor()
diff --git a/GTG/gtk/browser/task_pane.py b/GTG/gtk/browser/task_pane.py
index 82fc36e8c1..d46b300226 100644
--- a/GTG/gtk/browser/task_pane.py
+++ b/GTG/gtk/browser/task_pane.py
@@ -21,7 +21,9 @@
 from gi.repository import Gtk, GObject, Gdk, Gio, Pango
 from GTG.core.tasks import Task, Status
 from GTG.core.filters import TaskPaneFilter, SearchTaskFilter
-from GTG.core.sorters import *
+from GTG.core.sorters import (TaskAddedSorter, TaskDueSorter,
+                              TaskModifiedSorter, TaskStartSorter,
+                              TaskTagSorter, TaskTitleSorter)
 from GTG.gtk.browser.tag_pill import TagPill
 from gettext import gettext as _
 
diff --git a/GTG/gtk/colors.py b/GTG/gtk/colors.py
index 71a84bc15c..38a914e107 100644
--- a/GTG/gtk/colors.py
+++ b/GTG/gtk/colors.py
@@ -155,15 +155,12 @@ def get_colored_tags_markup(ds, tag_names):
 
 def generate_tag_color():
 
-    maxvalue = 1.0
-    flag = 0
-    while(flag == 0):
+    while True:
         rgba = random_color()
         my_color = rgb_to_hex(rgba)
         if my_color not in used_color:
-            flag = 1
-    used_color.append(my_color)
-    return my_color
+            used_color.append(my_color)
+            return my_color
 
 
 def grgba_to_hex(rgba, ignore_alpha=True):
diff --git a/GTG/gtk/editor/calendar.py b/GTG/gtk/editor/calendar.py
index 8cb8781a7d..5eccf65abe 100644
--- a/GTG/gtk/editor/calendar.py
+++ b/GTG/gtk/editor/calendar.py
@@ -99,7 +99,6 @@ def show(self):
         self.__is_user_just_browsing_the_calendar = False
 
     def __focus_out(self, g=None, s=None):
-        w = g.get_widget()
         # We should only close if the pointer click is out of the calendar !
         p = self.__window.get_window().get_pointer()
         s = self.__window.get_size()
diff --git a/GTG/gtk/editor/recurring_menu.py b/GTG/gtk/editor/recurring_menu.py
index ada27e7df9..3a88688c2b 100644
--- a/GTG/gtk/editor/recurring_menu.py
+++ b/GTG/gtk/editor/recurring_menu.py
@@ -52,7 +52,7 @@ def __init__(self, editor, task):
             ('recurr_year_today', self._on_recurr_year_today, None),
         ]:
             # is property action (property name instead of callback)
-            if type(action_disc[1]) == str:
+            if isinstance(action_disc[1], str):
                 self.install_property_action('.'.join([prefix, action_disc[0]]), action_disc[1])
             else:
                 self.install_action('.'.join([prefix, action_disc[0]]), action_disc[2], action_disc[1])
diff --git a/GTG/gtk/errorhandler.py b/GTG/gtk/errorhandler.py
index caf4d266c9..673340e28e 100644
--- a/GTG/gtk/errorhandler.py
+++ b/GTG/gtk/errorhandler.py
@@ -84,8 +84,8 @@ def context_info(self):
         return self._context_info
 
     @context_info.setter
-    def context_info(self, info, refresh: bool = True):
-        self._context_info = str(info) if info != None else None
+    def context_info(self, context_info, refresh: bool = True):
+        self._context_info = str(context_info) if context_info is not None else None
         if refresh:
             self._update_additional_info()
 
diff --git a/GTG/plugins/gamify/gamify.py b/GTG/plugins/gamify/gamify.py
index 5a062f14e3..7f0d23bca3 100644
--- a/GTG/plugins/gamify/gamify.py
+++ b/GTG/plugins/gamify/gamify.py
@@ -266,7 +266,7 @@ def activate(self, plugin_api):
         # Init the preference dialog
         try:
             self.pref_dialog = GamifyPreferences(self, self.plugin_api)
-        except:
+        except Exception:
             self.configureable = False
             log.debug('Cannot load preference dialog widget')
 
diff --git a/GTG/plugins/unmaintained/tomboy/tomboy.py b/GTG/plugins/unmaintained/tomboy/tomboy.py
index e7ea3e1170..a19b870562 100644
--- a/GTG/plugins/unmaintained/tomboy/tomboy.py
+++ b/GTG/plugins/unmaintained/tomboy/tomboy.py
@@ -94,7 +94,7 @@ def onTaskClosed(self, plugin_api):
             iter_start = self.textview.buff.get_iter_at_child_anchor(anchor)
             iter_end = iter_start.copy()
             iter_end.forward_char()
-            if type(widgets) == list and len(widgets) != 0:
+            if isinstance(widgets, list) and len(widgets) != 0:
                 # the anchor still contains a widget.
                 widget = widgets[0]
                 self.textview.buff.delete(iter_start, iter_end)
diff --git a/scripts/anonymize_task_file.py b/scripts/anonymize_task_file.py
index cbf08c0ac2..d879b126ff 100755
--- a/scripts/anonymize_task_file.py
+++ b/scripts/anonymize_task_file.py
@@ -35,7 +35,6 @@ def anonymize(filename, outputfile):
 
     for task in tasks:
         textnode = task.getElementsByTagName("title")[0].childNodes[0]
-        nodevalue = textnode.nodeValue
         replaced_title = re.sub('[^ \n\t]', 'm', textnode.nodeValue)
         textnode.nodeValue = "%s %s" % (task.getAttribute('id'),
                                         replaced_title)
diff --git a/tests/core/test_quickadd.py b/tests/core/test_quickadd.py
index 15433c268d..040bb5de01 100644
--- a/tests/core/test_quickadd.py
+++ b/tests/core/test_quickadd.py
@@ -149,6 +149,7 @@ def test_start(self):
         self.assertEqual(expected1, parse(text1))
         self.assertEqual(expected1, parse(text2))
         self.assertEqual(expected1, parse(text3))
+        self.assertEqual(expected2, parse(text4))
         self.assertEqual(expected3, parse(text5))
 
 
@@ -186,6 +187,7 @@ def test_due(self):
         self.assertEqual(expected1, parse(text1))
         self.assertEqual(expected1, parse(text2))
         self.assertEqual(expected1, parse(text3))
+        self.assertEqual(expected2, parse(text4))
         self.assertEqual(expected3, parse(text5))
 
 
diff --git a/tests/core/test_saved_search.py b/tests/core/test_saved_search.py
index 9a10679eca..b1fbdfc991 100644
--- a/tests/core/test_saved_search.py
+++ b/tests/core/test_saved_search.py
@@ -102,8 +102,8 @@ def test_xml_load_tree(self):
     def test_xml_write_simple(self):
 
         store = SavedSearchStore()
-        search1 = store.add(SavedSearch(uuid4(), 'Some @tag', 'Looking for some tag'))
-        search2 = store.add(SavedSearch(uuid4(), 'Some @other @tag', 'Looking for more'))
+        store.add(SavedSearch(uuid4(), 'Some @tag', 'Looking for some tag'))
+        store.add(SavedSearch(uuid4(), 'Some @other @tag', 'Looking for more'))
 
         xml_root = store.to_xml()
 
diff --git a/tests/core/test_tag_store.py b/tests/core/test_tag_store.py
index ff8d151fdd..a5ed02470f 100644
--- a/tests/core/test_tag_store.py
+++ b/tests/core/test_tag_store.py
@@ -81,7 +81,7 @@ def test_xml_load_bad(self):
 
     def test_xml_write_simple(self):
         store = TagStore()
-        tag = store.new('My_tag')
+        store.new('My_tag')
         tag2 = store.new('My_tag2')
         tag3 = store.new('My_tag3', tag2.id)
 
@@ -95,7 +95,7 @@ def test_xml_write_simple(self):
 
     def test_xml_write_tree(self):
         store = TagStore()
-        tag = store.new('My_tag')
+        store.new('My_tag')
         tag2 = store.new('My_tag2')
         tag3 = store.new('My_tag3', tag2.id)
 
diff --git a/tests/core/test_task.py b/tests/core/test_task.py
index 5db3419315..784008a386 100644
--- a/tests/core/test_task.py
+++ b/tests/core/test_task.py
@@ -279,7 +279,7 @@ def test_new_tree(self):
         store = TaskStore()
 
         root_task = store.new('My Root Task')
-        child_task = store.new('My Child Task', root_task.id)
+        store.new('My Child Task', root_task.id)
 
         self.assertEqual(store.count(), 2)
         self.assertEqual(store.count(root_only=True), 1)
@@ -570,7 +570,7 @@ def test_filter_tag(self):
         task1 = task_store.new('My Task')
         task2 = task_store.new('My Other Task')
         task3 = task_store.new('My Other Other Task')
-        task4 = task_store.new('My Other Other Other Task')
+        task_store.new('My Other Other Other Task')
 
         tag1 = Tag(id=uuid4(), name='A Tag')
         tag2 = Tag(id=uuid4(), name='Another Tag')
@@ -599,7 +599,7 @@ def test_filter_tag(self):
     def test_filter_custom(self):
         task_store = TaskStore()
 
-        task1 = task_store.new('My Task')
+        task_store.new('My Task')
         task2 = task_store.new('My Other Task')
 
         filtered = task_store.filter_custom('title', lambda t: 'Other' in t)
@@ -643,18 +643,6 @@ def test_simple_reverse_sort(self):
         self.assertEqual(task_store.data, expected)
 
 
-    def test_simple_reverse_sort(self):
-        task_store = TaskStore()
-
-        task1 = task_store.new('1. My Task')
-        task2 = task_store.new('2. My Other Task')
-
-        # Simple sort
-        task_store.sort(key='title',reverse=True)
-        expected = [task2, task1]
-        self.assertEqual(task_store.data, expected)
-
-
     def test_nested_sort(self):
         task_store = TaskStore()
 
@@ -680,7 +668,7 @@ def test_sort_custom_list(self):
 
         task1 = task_store.new('1. My Task')
         task2 = task_store.new('2. My Other Task')
-        task3 = task_store.new('3. My Other Other Task')
+        task_store.new('3. My Other Other Task')
         task4 = task_store.new('4. My Other Other Other Task')
 
         tasks = [task2, task4, task1]
diff --git a/tests/core/test_taskview.py b/tests/core/test_taskview.py
index bf7b4b947f..7478161149 100644
--- a/tests/core/test_taskview.py
+++ b/tests/core/test_taskview.py
@@ -16,8 +16,6 @@
 # this program.  If not, see <http://www.gnu.org/licenses/>.
 # -----------------------------------------------------------------------------
 
-import os
-import pytest
 import re
 from uuid import uuid4
 from unittest import TestCase