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 85e5fbef38..5c05c3ca3e 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,8 +2,8 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-from . import carrier
-from . import sale
+
+from . import carrier, sale
 
 __all__ = ['register']
 
diff --git a/setup.py b/setup.py
index 3ed5a4eac5..e02fd36e3d 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, slice=None):
diff --git a/tests/__init__.py b/tests/__init__.py
index 5c180a9580..5c264d44d5 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -2,7 +2,8 @@
 # this repository contains the full copyright notices and license terms.
 
 try:
-    from trytond.modules.carrier_subdivision.tests.test_carrier_subdivision import suite  # noqa: E501
+    from trytond.modules.carrier_subdivision.tests.test_carrier_subdivision import \
+        suite  # noqa: E501
 except ImportError:
     from .test_carrier_subdivision import suite
 
diff --git a/tests/test_carrier_subdivision.py b/tests/test_carrier_subdivision.py
index b558a4743e..fc0a295ca7 100644
--- a/tests/test_carrier_subdivision.py
+++ b/tests/test_carrier_subdivision.py
@@ -1,12 +1,11 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-import unittest
 import doctest
+import unittest
 
-from trytond.tests.test_tryton import ModuleTestCase
+from trytond.tests.test_tryton import (
+    ModuleTestCase, doctest_checker, doctest_teardown)
 from trytond.tests.test_tryton import suite as test_suite
-from trytond.tests.test_tryton import doctest_teardown
-from trytond.tests.test_tryton import doctest_checker
 
 
 class CarrierSubdivisionTestCase(ModuleTestCase):