diff --git a/.coafile b/.coafile
index 274ed76c..14d4c3ff 100644
--- a/.coafile
+++ b/.coafile
@@ -16,6 +16,7 @@ default_actions = *: ApplyPatchAction
 
 bears += KeywordBear
 keywords = pdb
+bears += PyUnusedCodeBear
 
 [all.autopep8]
 bears = PEP8Bear, PycodestyleBear
diff --git a/answers/final.py b/answers/final.py
index be262b91..f71aeb69 100644
--- a/answers/final.py
+++ b/answers/final.py
@@ -1,5 +1,4 @@
 from collections import OrderedDict, Counter
-import logging
 
 from gensim.parsing.preprocessing import STOPWORDS
 from gensim.utils import simple_preprocess
@@ -60,9 +59,7 @@ def get_answer(question, graph, final=False):
 
     grapheize(q_graph, q_doc, attrs={'q_type': q_type})
     scores = Counter()
-    found_common = False
     for start, end in q_graph.edges():
-        found_common = True
         if start in graph and end in graph:
             for path in networkx.algorithms.all_shortest_paths(
                     graph, start, end):
diff --git a/answers/service.py b/answers/service.py
index 9cd6ac38..11f597fd 100644
--- a/answers/service.py
+++ b/answers/service.py
@@ -1,5 +1,3 @@
-import json
-import os
 
 from flask import Flask, jsonify, request
 from gensim.summarization import summarize
diff --git a/plugins/coatils.py b/plugins/coatils.py
index 390e2a72..1d52e906 100644
--- a/plugins/coatils.py
+++ b/plugins/coatils.py
@@ -1,6 +1,5 @@
 from collections import OrderedDict
 import json
-import os
 import textwrap
 
 import requests
@@ -110,7 +109,6 @@ def ls(self, msg, match):
         Example: `ls bears python python3`
         """
         langs = list(map(lambda x: x.lower(), match.group(1).split()))
-        all_langs = Coatils.all_langs()
 
         bears = client.list.bears.get().json()
         bears = [{**{'name': bear}, **content}
diff --git a/plugins/explain.py b/plugins/explain.py
index 1c37b838..07990077 100644
--- a/plugins/explain.py
+++ b/plugins/explain.py
@@ -1,6 +1,5 @@
 import re
 import glob
-import os.path
 
 from errbot import BotPlugin, re_botcmd
 from errbot.templating import tenv
diff --git a/plugins/labhub.py b/plugins/labhub.py
index cee87e6c..4abc6379 100644
--- a/plugins/labhub.py
+++ b/plugins/labhub.py
@@ -1,5 +1,4 @@
 import datetime
-import json
 import os
 import re
 import time
diff --git a/tests/answer_test.py b/tests/answer_test.py
index aa3a3d58..8ad64043 100644
--- a/tests/answer_test.py
+++ b/tests/answer_test.py
@@ -1,5 +1,4 @@
 import os
-import unittest
 import logging
 
 from errbot.backends.test import FullStackTest
diff --git a/tests/coatils_test.py b/tests/coatils_test.py
index 02e822bc..cf3ad1da 100644
--- a/tests/coatils_test.py
+++ b/tests/coatils_test.py
@@ -1,5 +1,4 @@
 import logging
-import unittest
 import queue
 
 from errbot.backends.test import FullStackTest
@@ -88,7 +87,7 @@ def test_run_coala(self):
 
         # ensuring that only one result is yielded
         with self.assertRaises(queue.Empty):
-            next_msg = self.pop_message()
+            self.pop_message()
         # error
         self.push_message('!run a b\n```\nc\n```')
         self.assertEqual(self.pop_message(),
diff --git a/tests/git_stats_test.py b/tests/git_stats_test.py
index 6935cefb..4f16d0e7 100644
--- a/tests/git_stats_test.py
+++ b/tests/git_stats_test.py
@@ -2,7 +2,7 @@
 from tempfile import mkdtemp
 from errbot import BotPlugin
 import unittest
-from unittest.mock import Mock, MagicMock, create_autospec, PropertyMock, patch
+from unittest.mock import create_autospec
 
 from IGitt.GitHub.GitHubMergeRequest import GitHubMergeRequest
 from IGitt.GitLab.GitLabMergeRequest import GitLabMergeRequest
diff --git a/tests/labhub_test.py b/tests/labhub_test.py
index 5154b2ea..5a995a0e 100644
--- a/tests/labhub_test.py
+++ b/tests/labhub_test.py
@@ -1,8 +1,6 @@
 import logging
-import os
 import queue
 import textwrap
-import time
 import unittest
 from unittest.mock import Mock, MagicMock, create_autospec, PropertyMock, patch
 
diff --git a/tests/wolfram_alpha_test.py b/tests/wolfram_alpha_test.py
index 12c46ff2..e415cd2b 100755
--- a/tests/wolfram_alpha_test.py
+++ b/tests/wolfram_alpha_test.py
@@ -1,4 +1,3 @@
-import unittest
 import logging
 
 import vcr