diff --git a/Makefile b/Makefile
index 8e2dce2a..8c04a08d 100644
--- a/Makefile
+++ b/Makefile
@@ -49,7 +49,7 @@ test: venv-upgrade venv-dev-upgrade ## Run unit tests
 
 format: venv-dev-upgrade ## Format the code
 	@git ls-files '*.py' | xargs ./venv/bin/python -m autopep8 --in-place --jobs 0 --global-config=.flake8
-	@git ls-files '*.py' | xargs ./venv/bin/python -m autoflake --in-place --jobs 0 --remove-all-unused-imports --remove-unused-variables --remove-duplicate-keys
+	@git ls-files '*.py' | xargs ./venv/bin/python -m autoflake --in-place --remove-all-unused-imports --remove-unused-variables --remove-duplicate-keys --exclude="compat.py"
 	./venv/bin/python -m black ./glances --exclude outputs/static
 
 flake8: venv-dev-upgrade ## Run flake8 linter.
diff --git a/docs/conf.py b/docs/conf.py
index ade53f17..26b188d6 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -12,6 +12,7 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
+from glances import __version__
 import sys
 import os
 from datetime import datetime
@@ -24,7 +25,6 @@ from datetime import datetime
 # Insert Glances' path into the system.
 sys.path.insert(0, os.path.abspath('..'))
 
-from glances import __version__
 
 # -- General configuration ------------------------------------------------
 
@@ -223,17 +223,17 @@ htmlhelp_basename = 'Glancesdoc'
 # -- Options for LaTeX output ---------------------------------------------
 
 latex_elements = {
-# The paper size ('letterpaper' or 'a4paper').
-#'papersize': 'letterpaper',
+    # The paper size ('letterpaper' or 'a4paper').
+    # 'papersize': 'letterpaper',
 
-# The font size ('10pt', '11pt' or '12pt').
-#'pointsize': '10pt',
+    # The font size ('10pt', '11pt' or '12pt').
+    # 'pointsize': '10pt',
 
-# Additional stuff for the LaTeX preamble.
-#'preamble': '',
+    # Additional stuff for the LaTeX preamble.
+    # 'preamble': '',
 
-# Latex figure (float) alignment
-#'figure_align': 'htbp',
+    # Latex figure (float) alignment
+    # 'figure_align': 'htbp',
 }
 
 # Grouping the document tree into LaTeX files. List of tuples
diff --git a/glances/amps/glances_amp.py b/glances/amps/glances_amp.py
index ecb7092f..1c9175bd 100644
--- a/glances/amps/glances_amp.py
+++ b/glances/amps/glances_amp.py
@@ -22,7 +22,7 @@ The return string is a string with one or more line (\n between lines).
 If the *one_line* var is true then the AMP will be displayed in one line.
 """
 
-from glances.compat import u, b, n, nativestr
+from glances.compat import u
 from glances.timer import Timer
 from glances.logger import logger
 
diff --git a/glances/exports/glances_cassandra.py b/glances/exports/glances_cassandra.py
index b8bb33b9..e3a347c8 100644
--- a/glances/exports/glances_cassandra.py
+++ b/glances/exports/glances_cassandra.py
@@ -15,7 +15,6 @@ from numbers import Number
 
 from glances.logger import logger
 from glances.exports.glances_export import GlancesExport
-from glances.compat import iteritems
 
 from cassandra.auth import PlainTextAuthProvider
 from cassandra.cluster import Cluster
@@ -77,7 +76,7 @@ class Export(GlancesExport):
         # Keyspace
         try:
             session.set_keyspace(self.keyspace)
-        except InvalidRequest as e:
+        except InvalidRequest:
             logger.info("Create keyspace {} on the Cassandra cluster".format(self.keyspace))
             c = "CREATE KEYSPACE %s WITH replication = { 'class': 'SimpleStrategy', 'replication_factor': '%s' }" % (
                 self.keyspace,
diff --git a/glances/exports/glances_couchdb.py b/glances/exports/glances_couchdb.py
index 249d53cb..07d2cbd2 100644
--- a/glances/exports/glances_couchdb.py
+++ b/glances/exports/glances_couchdb.py
@@ -62,7 +62,7 @@ class Export(GlancesExport):
 
         try:
             s[self.db]
-        except Exception as e:
+        except Exception:
             # Database did not exist
             # Create it...
             s.create(self.db)
diff --git a/glances/exports/glances_elasticsearch.py b/glances/exports/glances_elasticsearch.py
index 960236e0..5fa5f1d4 100644
--- a/glances/exports/glances_elasticsearch.py
+++ b/glances/exports/glances_elasticsearch.py
@@ -16,7 +16,6 @@ from glances.logger import logger
 from glances.exports.glances_export import GlancesExport
 
 from elasticsearch import Elasticsearch, helpers
-from elasticsearch import __version__ as elk_version
 
 
 class Export(GlancesExport):
diff --git a/glances/exports/glances_graph.py b/glances/exports/glances_graph.py
index 5c33e4f8..51b77b2a 100644
--- a/glances/exports/glances_graph.py
+++ b/glances/exports/glances_graph.py
@@ -51,7 +51,7 @@ class Export(GlancesExport):
         # Check if output folder is writeable
         try:
             tempfile.TemporaryFile(dir=self.path)
-        except OSError as e:
+        except OSError:
             logger.critical("Graph output folder {} is not writeable".format(self.path))
             sys.exit(2)
 
diff --git a/glances/exports/glances_kafka.py b/glances/exports/glances_kafka.py
index 936d4bff..275b9595 100644
--- a/glances/exports/glances_kafka.py
+++ b/glances/exports/glances_kafka.py
@@ -12,12 +12,10 @@
 import sys
 
 from glances.logger import logger
-from glances.compat import iteritems
 from glances.exports.glances_export import GlancesExport
 
 from kafka import KafkaProducer
 import json
-import codecs
 
 
 class Export(GlancesExport):
diff --git a/glances/exports/glances_restful.py b/glances/exports/glances_restful.py
index 975bc1d5..8afe32b1 100644
--- a/glances/exports/glances_restful.py
+++ b/glances/exports/glances_restful.py
@@ -9,7 +9,6 @@
 
 """RESTful interface class."""
 
-import sys
 
 from glances.compat import listkeys
 from glances.logger import logger
diff --git a/glances/exports/glances_riemann.py b/glances/exports/glances_riemann.py
index b500b829..5cae105d 100644
--- a/glances/exports/glances_riemann.py
+++ b/glances/exports/glances_riemann.py
@@ -10,7 +10,6 @@
 """Riemann interface class."""
 
 import socket
-import sys
 from numbers import Number
 
 from glances.compat import range
diff --git a/glances/exports/glances_statsd.py b/glances/exports/glances_statsd.py
index ba65bd82..022d61eb 100644
--- a/glances/exports/glances_statsd.py
+++ b/glances/exports/glances_statsd.py
@@ -9,7 +9,6 @@
 
 """Statsd interface class."""
 
-import sys
 from numbers import Number
 
 from glances.compat import range
diff --git a/glances/logger.py b/glances/logger.py
index ffde42b8..3da96356 100644
--- a/glances/logger.py
+++ b/glances/logger.py
@@ -17,7 +17,6 @@ import tempfile
 import logging
 import logging.config
 
-from glances.globals import BSD, LINUX, MACOS, SUNOS, WINDOWS, WSL
 from glances.globals import safe_makedirs
 
 # Choose the good place for the log file (see issue #1575)
diff --git a/glances/outputs/glances_bottle.py b/glances/outputs/glances_bottle.py
index fc13473c..32a5cbec 100644
--- a/glances/outputs/glances_bottle.py
+++ b/glances/outputs/glances_bottle.py
@@ -198,7 +198,6 @@ class GlancesBottle(object):
 
     def end(self):
         """End the bottle."""
-        pass
 
     def _index(self, refresh_time=None):
         """Bottle callback for index.html (/) file."""
diff --git a/glances/outputs/glances_curses.py b/glances/outputs/glances_curses.py
index 1993a2ba..0e55b609 100644
--- a/glances/outputs/glances_curses.py
+++ b/glances/outputs/glances_curses.py
@@ -1231,15 +1231,11 @@ class GlancesCursesStandalone(_GlancesCurses):
 
     """Class for the Glances curse standalone."""
 
-    pass
-
 
 class GlancesCursesClient(_GlancesCurses):
 
     """Class for the Glances curse client."""
 
-    pass
-
 
 class GlancesTextbox(Textbox, object):
     def __init__(self, *args, **kwargs):
diff --git a/glances/outputs/glances_curses_browser.py b/glances/outputs/glances_curses_browser.py
index 19419375..caa567f4 100644
--- a/glances/outputs/glances_curses_browser.py
+++ b/glances/outputs/glances_curses_browser.py
@@ -9,7 +9,6 @@
 
 """Curses browser interface class ."""
 
-import sys
 import math
 import curses
 from glances.outputs.glances_curses import _GlancesCurses
diff --git a/glances/outputs/glances_sparklines.py b/glances/outputs/glances_sparklines.py
index bb0fd9ba..95825d2e 100644
--- a/glances/outputs/glances_sparklines.py
+++ b/glances/outputs/glances_sparklines.py
@@ -12,7 +12,6 @@
 from __future__ import unicode_literals
 from __future__ import division
 import sys
-from math import modf
 from glances.logger import logger
 from glances.compat import nativestr
 
diff --git a/glances/outputs/glances_stdout_csv.py b/glances/outputs/glances_stdout_csv.py
index 7a48aa6f..7822608f 100644
--- a/glances/outputs/glances_stdout_csv.py
+++ b/glances/outputs/glances_stdout_csv.py
@@ -11,7 +11,6 @@
 
 import time
 
-from glances.logger import logger
 from glances.compat import printandflush
 
 
diff --git a/glances/outputs/glances_stdout_issue.py b/glances/outputs/glances_stdout_issue.py
index 22452c9a..f294c1d4 100644
--- a/glances/outputs/glances_stdout_issue.py
+++ b/glances/outputs/glances_stdout_issue.py
@@ -81,7 +81,7 @@ class GlancesStdoutIssue(object):
             try:
                 # Update the stats
                 stats._plugins[plugin].update()
-            except Exception as e:
+            except Exception:
                 pass
 
         time.sleep(3)
diff --git a/glances/outputs/glances_stdout_json.py b/glances/outputs/glances_stdout_json.py
index 304851ce..0bab0173 100644
--- a/glances/outputs/glances_stdout_json.py
+++ b/glances/outputs/glances_stdout_json.py
@@ -11,7 +11,6 @@
 
 import time
 
-from glances.logger import logger
 from glances.compat import printandflush
 
 
diff --git a/glances/plugins/glances_alert.py b/glances/plugins/glances_alert.py
index 9334ec93..e02d3d77 100644
--- a/glances/plugins/glances_alert.py
+++ b/glances/plugins/glances_alert.py
@@ -11,7 +11,6 @@
 
 from datetime import datetime
 
-from glances.logger import logger
 from glances.events import glances_events
 from glances.thresholds import glances_thresholds
 
diff --git a/glances/plugins/glances_cpu.py b/glances/plugins/glances_cpu.py
index 2f7ec9a6..7ee4c977 100644
--- a/glances/plugins/glances_cpu.py
+++ b/glances/plugins/glances_cpu.py
@@ -9,7 +9,6 @@
 
 """CPU plugin."""
 
-from glances.logger import logger
 from glances.timer import getTimeSinceLastUpdate
 from glances.compat import iterkeys
 from glances.cpu_percent import cpu_percent
diff --git a/glances/plugins/glances_diskio.py b/glances/plugins/glances_diskio.py
index 231332c3..a238e6d0 100644
--- a/glances/plugins/glances_diskio.py
+++ b/glances/plugins/glances_diskio.py
@@ -13,7 +13,6 @@ from __future__ import unicode_literals
 from glances.compat import nativestr, n
 from glances.timer import getTimeSinceLastUpdate
 from glances.plugins.glances_plugin import GlancesPlugin
-from glances.logger import logger
 
 import psutil
 
diff --git a/glances/plugins/glances_folders.py b/glances/plugins/glances_folders.py
index ef9b6d49..3a8d9710 100644
--- a/glances/plugins/glances_folders.py
+++ b/glances/plugins/glances_folders.py
@@ -15,7 +15,6 @@ import numbers
 from glances.compat import nativestr
 from glances.folder_list import FolderList as glancesFolderList
 from glances.plugins.glances_plugin import GlancesPlugin
-from glances.logger import logger
 
 
 class Plugin(GlancesPlugin):
diff --git a/glances/plugins/glances_help.py b/glances/plugins/glances_help.py
index 390f7633..2d3fadf2 100644
--- a/glances/plugins/glances_help.py
+++ b/glances/plugins/glances_help.py
@@ -36,11 +36,9 @@ class Plugin(GlancesPlugin):
 
     def reset(self):
         """No stats. It is just a plugin to display the help."""
-        pass
 
     def update(self):
         """No stats. It is just a plugin to display the help."""
-        pass
 
     def generate_view_data(self):
         """Generate the views."""
diff --git a/glances/plugins/glances_ip.py b/glances/plugins/glances_ip.py
index 8919130c..5e0c9c06 100644
--- a/glances/plugins/glances_ip.py
+++ b/glances/plugins/glances_ip.py
@@ -12,7 +12,7 @@
 import threading
 from json import loads
 
-from glances.compat import iterkeys, urlopen, queue, urlopen_auth
+from glances.compat import queue, urlopen, urlopen_auth
 from glances.logger import logger
 from glances.timer import Timer, getTimeSinceLastUpdate
 from glances.plugins.glances_plugin import GlancesPlugin
diff --git a/glances/plugins/glances_mem.py b/glances/plugins/glances_mem.py
index e638bdd3..27ff03b1 100644
--- a/glances/plugins/glances_mem.py
+++ b/glances/plugins/glances_mem.py
@@ -9,7 +9,6 @@
 
 """Virtual memory plugin."""
 
-from glances.logger import logger
 from glances.compat import iterkeys
 from glances.plugins.glances_plugin import GlancesPlugin
 
diff --git a/glances/plugins/glances_ports.py b/glances/plugins/glances_ports.py
index e6608e7b..3d43f258 100644
--- a/glances/plugins/glances_ports.py
+++ b/glances/plugins/glances_ports.py
@@ -19,7 +19,7 @@ import numbers
 from glances.globals import WINDOWS, MACOS, BSD
 from glances.ports_list import GlancesPortsList
 from glances.web_list import GlancesWebList
-from glances.timer import Timer, Counter
+from glances.timer import Counter
 from glances.compat import bool_type
 from glances.logger import logger
 from glances.plugins.glances_plugin import GlancesPlugin
diff --git a/glances/plugins/glances_quicklook.py b/glances/plugins/glances_quicklook.py
index f6d569a7..e1cdac70 100644
--- a/glances/plugins/glances_quicklook.py
+++ b/glances/plugins/glances_quicklook.py
@@ -10,7 +10,6 @@
 """Quicklook plugin."""
 
 from glances.cpu_percent import cpu_percent
-from glances.logger import logger
 from glances.outputs.glances_bars import Bar
 from glances.outputs.glances_sparklines import Sparkline
 from glances.plugins.glances_plugin import GlancesPlugin
diff --git a/glances/plugins/glances_system.py b/glances/plugins/glances_system.py
index 88f2ee9e..836f92b9 100644
--- a/glances/plugins/glances_system.py
+++ b/glances/plugins/glances_system.py
@@ -14,7 +14,6 @@ import platform
 import re
 from io import open
 
-from glances.logger import logger
 from glances.compat import iteritems
 from glances.plugins.glances_plugin import GlancesPlugin
 
diff --git a/glances/plugins/glances_wifi.py b/glances/plugins/glances_wifi.py
index cd0268f0..624c3df6 100644
--- a/glances/plugins/glances_wifi.py
+++ b/glances/plugins/glances_wifi.py
@@ -90,11 +90,9 @@ class Plugin(GlancesPlugin):
                 except InterfaceError as e:
                     # Not a Wifi interface
                     logger.debug("WIFI plugin: Scan InterfaceError ({})".format(e))
-                    pass
                 except Exception as e:
                     # Other error
                     logger.debug("WIFI plugin: Can not grab cell stats ({})".format(e))
-                    pass
                 else:
                     for wifi_cell in wifi_cells:
                         hotspot = {
diff --git a/glances/server.py b/glances/server.py
index 4048b0e4..a4c5e88f 100644
--- a/glances/server.py
+++ b/glances/server.py
@@ -15,7 +15,7 @@ import sys
 from base64 import b64decode
 
 from glances import __version__
-from glances.compat import SimpleXMLRPCRequestHandler, SimpleXMLRPCServer, Server
+from glances.compat import SimpleXMLRPCRequestHandler, SimpleXMLRPCServer
 from glances.autodiscover import GlancesAutoDiscoverClient
 from glances.logger import logger
 from glances.stats_server import GlancesStatsServer
diff --git a/setup.py b/setup.py
index 925b2206..06764efd 100755
--- a/setup.py
+++ b/setup.py
@@ -68,7 +68,7 @@ def get_install_extras_require():
         'sparklines': ['sparklines'],
         'web': ['bottle', 'requests'],
         'wifi': ['wifi']
-        #'gpu' and 'sensors' ==> See bellow
+        # 'gpu' and 'sensors' ==> See bellow
     }
     if PY3:
         extras_require['export'].append('influxdb-client')
diff --git a/unitest.py b/unitest.py
index d6f29888..f49bb687 100755
--- a/unitest.py
+++ b/unitest.py
@@ -30,7 +30,7 @@ from glances.secure import secure_popen
 from glances.compat import PY3
 
 if PY3:
-    from tracemalloc import Snapshot
+    pass
 
 # Global variables
 # =================