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 3b8c59f3ee..ee174d54cb 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 sale
 
 
diff --git a/sale.py b/sale.py
index 32438cc086..54ad64f3b5 100644
--- a/sale.py
+++ b/sale.py
@@ -5,10 +5,10 @@ import datetime
 from collections import defaultdict
 
 from trytond.i18n import gettext
-from trytond.pool import PoolMeta, Pool
 from trytond.model import ModelView, Workflow
-from trytond.transaction import Transaction
+from trytond.pool import Pool, PoolMeta
 from trytond.tools import grouped_slice
+from trytond.transaction import Transaction
 
 from .exceptions import StockQuantityError, StockQuantityWarning
 
diff --git a/setup.py b/setup.py
index 86bb7f5efd..96bf5d8344 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 8d02d2b574..0c7ed2202e 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.sale_stock_quantity.tests.test_sale_stock_quantity import suite  # noqa: E501
+    from trytond.modules.sale_stock_quantity.tests.test_sale_stock_quantity import \
+        suite  # noqa: E501
 except ImportError:
     from .test_sale_stock_quantity import suite
 
diff --git a/tests/test_sale_stock_quantity.py b/tests/test_sale_stock_quantity.py
index d7dc9a511c..51df819cad 100644
--- a/tests/test_sale_stock_quantity.py
+++ b/tests/test_sale_stock_quantity.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
 
 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 SaleStockQuantityTestCase(ModuleTestCase):