diff --git a/nova-api-proxy/nova-api-proxy/nova_api_proxy/api_proxy.py b/nova-api-proxy/nova-api-proxy/nova_api_proxy/api_proxy.py
index d05f17db..61a6afac 100644
--- a/nova-api-proxy/nova-api-proxy/nova_api_proxy/api_proxy.py
+++ b/nova-api-proxy/nova-api-proxy/nova_api_proxy/api_proxy.py
@@ -5,16 +5,17 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-import os
-import sys
-import signal
 import eventlet
+import os
+import signal
+import sys
 
 from oslo_config import cfg
 from oslo_log import log as logging
+
 from nova_api_proxy.common import config
-from nova_api_proxy.common.service import Server
 from nova_api_proxy.common import histogram
+from nova_api_proxy.common.service import Server
 
 LOG = logging.getLogger(__name__)
 
diff --git a/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/acceptor.py b/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/acceptor.py
index 8a83cf64..622f9c1f 100644
--- a/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/acceptor.py
+++ b/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/acceptor.py
@@ -4,19 +4,20 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 import json
+from paste.request import construct_url
 import routes
 import webob.dec
 import webob.exc
 
-from paste.request import construct_url
 from oslo_config import cfg
 from oslo_log import log as logging
-from nova_api_proxy.common import utils
+
+from nova_api_proxy.apps.dispatcher import APIDispatcher
+from nova_api_proxy.apps.dispatcher import Router
+from nova_api_proxy.apps.proxy import Proxy
 from nova_api_proxy.common.service import Middleware
 from nova_api_proxy.common.service import Request
-from nova_api_proxy.apps.dispatcher import Router
-from nova_api_proxy.apps.dispatcher import APIDispatcher
-from nova_api_proxy.apps.proxy import Proxy
+from nova_api_proxy.common import utils
 
 
 LOG = logging.getLogger(__name__)
diff --git a/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/dispatcher.py b/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/dispatcher.py
index 99d112b0..0d1a96a9 100644
--- a/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/dispatcher.py
+++ b/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/dispatcher.py
@@ -10,8 +10,9 @@ import webob.exc
 
 from oslo_config import cfg
 from oslo_log import log as proxy_log
-from nova_api_proxy.common import utils
+
 from nova_api_proxy.common.service import Middleware
+from nova_api_proxy.common import utils
 
 LOG = proxy_log.getLogger(__name__)
 
diff --git a/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/proxy.py b/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/proxy.py
index 685f64a4..80e8b97b 100644
--- a/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/proxy.py
+++ b/nova-api-proxy/nova-api-proxy/nova_api_proxy/apps/proxy.py
@@ -13,13 +13,15 @@
 #
 
 import httplib
-import urllib
-from paste.proxy import TransparentProxy
 from paste.proxy import parse_headers
+from paste.proxy import TransparentProxy
+import urllib
+
 from oslo_log import log as logging
+
+from nova_api_proxy.common import histogram
 from nova_api_proxy.common.service import Application
 from nova_api_proxy.common.timestamp import get_monotonic_timestamp_in_ms
-from nova_api_proxy.common import histogram
 
 LOG = logging.getLogger(__name__)
 
diff --git a/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/histogram.py b/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/histogram.py
index f0a258a7..a657d989 100644
--- a/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/histogram.py
+++ b/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/histogram.py
@@ -3,9 +3,9 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 #
-import math
 import array
 import datetime
+import math
 
 from oslo_log import log as logging
 
diff --git a/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/service.py b/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/service.py
index e14c64a0..4a1eb563 100644
--- a/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/service.py
+++ b/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/service.py
@@ -15,14 +15,16 @@
 #
 
 import errno
-import os
 import eventlet
-import webob.dec
-import webob.exc
 import eventlet.greenio
 import eventlet.wsgi
+import os
+import webob.dec
+import webob.exc
+
 from eventlet.green import socket
 from eventlet.green import ssl
+
 from oslo_config import cfg
 from oslo_log import log as logging
 
diff --git a/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/timestamp.py b/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/timestamp.py
index fef84409..7fb143b3 100644
--- a/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/timestamp.py
+++ b/nova-api-proxy/nova-api-proxy/nova_api_proxy/common/timestamp.py
@@ -3,8 +3,8 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 #
-import os
 import ctypes
+import os
 
 CLOCK_MONOTONIC_RAW = 4  # from <linux/time.h>
 
diff --git a/nova-api-proxy/tox.ini b/nova-api-proxy/tox.ini
index 1353683b..d72ce7c4 100644
--- a/nova-api-proxy/tox.ini
+++ b/nova-api-proxy/tox.ini
@@ -25,20 +25,19 @@ commands = {posargs}
 # - hacking codes -
 # H104: File contains nothing but comments
 # H301: one import per line
-# H306: imports not in alphabetical order
 # H404: multi line docstring should start without a leading new line
 # H405: multi line docstring summary not separated with an empty line
 # H501: Do not use self.__dict__ for string formatting
 # - flake8 codes -
 # F821 undefined name 'unicode' (python3 specific)
 ignore=E123,E127,E129
-       H104,H301,H306,H404,H405,H501,
+       H104,H301,H404,H405,H501,
        F821
 # H106 Don’t put vim configuration in source files (off by default).
 # H203 Use assertIs(Not)None to check for None (off by default).
 # TODO: enable: H904 Delay string interpolations at logging calls (off by default).
 enable-extensions = H106,H203
-max-line-length=84   
+max-line-length=84
 
 [testenv:pep8]
 usedevelop = False