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 6ba06d2816..17f468e7ac 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,6 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
+
 from . import stock
 
 
diff --git a/setup.py b/setup.py
index 8fafb4f580..f32a10de01 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/stock.py b/stock.py
index 5cf815085a..533d0177b3 100644
--- a/stock.py
+++ b/stock.py
@@ -1,13 +1,13 @@
 # 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 sql import Cast, Literal
-from sql.functions import Substring, Position
+from sql.functions import Position, Substring
 
 from trytond import backend
 from trytond.i18n import gettext
 from trytond.model import ModelSQL, ModelView, Workflow, fields, tree
 from trytond.pool import Pool, PoolMeta
-from trytond.pyson import Eval, Bool, Id, If
+from trytond.pyson import Bool, Eval, Id, If
 from trytond.transaction import Transaction
 
 from .exceptions import PackageError
diff --git a/tests/test_stock_package.py b/tests/test_stock_package.py
index 6f32610a07..787e24db0a 100644
--- a/tests/test_stock_package.py
+++ b/tests/test_stock_package.py
@@ -1,11 +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
+
 import trytond.tests.test_tryton
-from trytond.tests.test_tryton import ModuleTestCase
-from trytond.tests.test_tryton import doctest_teardown
-from trytond.tests.test_tryton import doctest_checker
+from trytond.tests.test_tryton import (
+    ModuleTestCase, doctest_checker, doctest_teardown)
 
 
 class StockPackageTestCase(ModuleTestCase):