diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 0000000000..e1c6495da9
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,3 @@
+[settings]
+multi_line_output=4
+known_first_party=trytond
diff --git a/__init__.py b/__init__.py
index 6b0b8307dd..1b82d64baa 100644
--- a/__init__.py
+++ b/__init__.py
@@ -1,8 +1,8 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 from trytond.pool import Pool
-from . import notification
-from . import ir
+
+from . import ir, notification
 
 
 def register():
diff --git a/notification.py b/notification.py
index 0f60863be4..6fc70eef2a 100644
--- a/notification.py
+++ b/notification.py
@@ -8,22 +8,22 @@ from email.mime.multipart import MIMEMultipart
 from email.mime.nonmultipart import MIMENonMultipart
 from email.utils import getaddresses
 
+from genshi.template import TextTemplate
 from sql import Null
 from sql.operators import Concat
-from genshi.template import TextTemplate
 
 from trytond.config import config
 from trytond.i18n import gettext
-from trytond.model import ModelView, ModelSQL, fields
+from trytond.ir.resource import ResourceAccessMixin
+from trytond.model import ModelSQL, ModelView, fields
 from trytond.pool import Pool
 from trytond.pyson import Eval
 from trytond.report import get_email
-from trytond.sendmail import sendmail_transactional, SMTPDataManager
+from trytond.sendmail import SMTPDataManager, sendmail_transactional
 from trytond.tools.email_ import set_from_header
 from trytond.transaction import Transaction
-from .exceptions import TemplateError
 
-from trytond.ir.resource import ResourceAccessMixin
+from .exceptions import TemplateError
 
 
 class Email(ModelSQL, ModelView):
diff --git a/setup.py b/setup.py
index 5da74e107a..5575be7f87 100755
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,8 @@ import io
 import os
 import re
 from configparser import ConfigParser
-from setuptools import setup, find_packages
+
+from setuptools import find_packages, setup
 
 
 def read(fname):
diff --git a/tests/__init__.py b/tests/__init__.py
index 02b460a82a..48ab535d38 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -2,8 +2,8 @@
 # this repository contains the full copyright notices and license terms.
 
 try:
-    from trytond.modules.notification_email.tests.test_notification_email \
-        import suite
+    from trytond.modules.notification_email.tests.test_notification_email import (
+        suite)
 except ImportError:
     from .test_notification_email import suite
 
diff --git a/tests/test_notification_email.py b/tests/test_notification_email.py
index 0d836d82e3..21c2f92762 100644
--- a/tests/test_notification_email.py
+++ b/tests/test_notification_email.py
@@ -3,17 +3,17 @@
 import datetime as dt
 import sys
 import unittest
-from unittest.mock import patch, ANY
+from unittest.mock import ANY, patch
 
-from trytond.tests.test_tryton import ModuleTestCase, with_transaction
-from trytond.tests.test_tryton import suite as test_suite
-from trytond.pool import Pool
 from trytond.config import config
-from trytond.transaction import Transaction
-
 from trytond.modules.company.tests import CompanyTestMixin
-from trytond.modules.notification_email import notification \
-    as notification_module
+from trytond.modules.notification_email import \
+    notification as notification_module
+from trytond.pool import Pool
+from trytond.tests.test_tryton import ModuleTestCase
+from trytond.tests.test_tryton import suite as test_suite
+from trytond.tests.test_tryton import with_transaction
+from trytond.transaction import Transaction
 
 FROM = 'tryton@example.com'