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 4ff5fd3ac5..a898f08596 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 customs
-from . import product
+
+from . import customs, product
 
 
 def register():
diff --git a/customs.py b/customs.py
index f19eb01bc8..0509e6219c 100644
--- a/customs.py
+++ b/customs.py
@@ -6,11 +6,10 @@ from decimal import Decimal
 from sql import Null
 
 from trytond.model import (
-    ModelSQL, ModelView, DeactivableMixin, MatchMixin, fields)
-from trytond.pyson import Eval, If, Bool
-from trytond.pool import Pool
-
+    DeactivableMixin, MatchMixin, ModelSQL, ModelView, fields)
 from trytond.modules.product import price_digits
+from trytond.pool import Pool
+from trytond.pyson import Bool, Eval, If
 
 # Use 2 chars numbering to allow string comparison
 MONTHS = [
diff --git a/product.py b/product.py
index d32d6d7efe..4ce5123457 100644
--- a/product.py
+++ b/product.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.
-from trytond.pool import PoolMeta, Pool
+from trytond import backend
 from trytond.model import ModelSQL, ModelView, fields, sequence_ordered
-from trytond.pyson import Eval, Or, Bool
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Bool, Eval, Or
 from trytond.tools import grouped_slice
 from trytond.transaction import Transaction
-from trytond import backend
 
 
 class Category(metaclass=PoolMeta):
diff --git a/setup.py b/setup.py
index 3b6be76c71..2ffce850bb 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_customs.py b/tests/test_customs.py
index fad9c3a320..4a7130c591 100644
--- a/tests/test_customs.py
+++ b/tests/test_customs.py
@@ -3,12 +3,13 @@
 
 
 import unittest
-from decimal import Decimal
 from datetime import date
+from decimal import Decimal
 
-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.tests.test_tryton import ModuleTestCase
+from trytond.tests.test_tryton import suite as test_suite
+from trytond.tests.test_tryton import with_transaction
 
 
 class CustomsTestCase(ModuleTestCase):