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 eaf8a1dcb7..345ee7479b 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 e0986638ba..6d2dcffb0e 100644
--- a/sale.py
+++ b/sale.py
@@ -6,16 +6,16 @@ from decimal import Decimal
 from simpleeval import simple_eval
 
 from trytond.i18n import gettext
-from trytond.pool import PoolMeta, Pool
 from trytond.model import (
-    ModelSQL, ModelView, MatchMixin, Workflow, DeactivableMixin, fields)
-from trytond.pyson import Eval, If, Bool
-from trytond.transaction import Transaction
-from trytond.tools import decistmt
-
+    DeactivableMixin, MatchMixin, ModelSQL, ModelView, Workflow, fields)
 from trytond.modules.currency.fields import Monetary
 from trytond.modules.product import price_digits, round_price
 from trytond.modules.product_price_list import Null
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Bool, Eval, If
+from trytond.tools import decistmt
+from trytond.transaction import Transaction
+
 from .exceptions import FormulaError
 
 
diff --git a/setup.py b/setup.py
index 914f9d039a..da516a79d3 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/test_sale_promotion.py b/tests/test_sale_promotion.py
index f01f7f04d2..941676a535 100644
--- a/tests/test_sale_promotion.py
+++ b/tests/test_sale_promotion.py
@@ -1,13 +1,12 @@
 # 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 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
+import unittest
 
+import trytond.tests.test_tryton
 from trytond.modules.company.tests import CompanyTestMixin
+from trytond.tests.test_tryton import (
+    ModuleTestCase, doctest_checker, doctest_teardown)
 
 
 class SalePromotionTestCase(CompanyTestMixin, ModuleTestCase):