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 34afd60dc7..cde5bc6687 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,9 +2,8 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-from . import sale
-from . import account
-from . import stock
+
+from . import account, sale, stock
 
 
 def register():
diff --git a/account.py b/account.py
index aa7ff5b49e..347d8ad752 100644
--- a/account.py
+++ b/account.py
@@ -3,7 +3,7 @@
 
 from trytond.model import fields
 from trytond.pool import Pool, PoolMeta
-from trytond.pyson import If, Eval, Bool
+from trytond.pyson import Bool, Eval, If
 
 
 def AccountTypeMixin(template=False):
diff --git a/exceptions.py b/exceptions.py
index 1a1751f5ae..0cf332e8e6 100644
--- a/exceptions.py
+++ b/exceptions.py
@@ -1,7 +1,7 @@
 # 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.model.exceptions import ValidationError, AccessError
+from trytond.model.exceptions import AccessError, ValidationError
 
 
 class FormulaError(ValidationError):
diff --git a/sale.py b/sale.py
index 5f2d1222e8..095dae2aea 100644
--- a/sale.py
+++ b/sale.py
@@ -1,19 +1,20 @@
 # 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 decimal import Decimal
-from simpleeval import simple_eval
 from itertools import chain
 
+from simpleeval import simple_eval
+
 from trytond.i18n import gettext
-from trytond.pool import Pool, PoolMeta
 from trytond.model import (
-    ModelSQL, ModelView, Workflow, DeactivableMixin, fields)
-from trytond.pyson import Eval, Bool
-from trytond.tools import decistmt
-from trytond.transaction import Transaction
+    DeactivableMixin, ModelSQL, ModelView, Workflow, fields)
 from trytond.modules.company.model import (
     CompanyMultiValueMixin, CompanyValueMixin)
 from trytond.modules.currency.fields import Monetary
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Bool, Eval
+from trytond.tools import decistmt
+from trytond.transaction import Transaction
 
 from .exceptions import FormulaError
 
diff --git a/setup.py b/setup.py
index eceecbbc1b..5b14c2aa16 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 8a44009b34..dcb068bd90 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_advance_payment.tests.test_sale_advance_payment import suite  # noqa: E501
+    from trytond.modules.sale_advance_payment.tests.test_sale_advance_payment import \
+        suite  # noqa: E501
 except ImportError:
     from .test_sale_advance_payment import suite
 
diff --git a/tests/test_sale_advance_payment.py b/tests/test_sale_advance_payment.py
index c1e4f44c1d..34cf14a7ef 100644
--- a/tests/test_sale_advance_payment.py
+++ b/tests/test_sale_advance_payment.py
@@ -1,10 +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, doctest_checker, doctest_teardown)
 from trytond.tests.test_tryton import suite as test_suite
-from trytond.tests.test_tryton import ModuleTestCase
-from trytond.tests.test_tryton import doctest_teardown, doctest_checker
 
 
 class SaleAdvancePaymentTestCase(ModuleTestCase):