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 ca26219a3a..ee5329741f 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,10 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 from trytond.pool import Pool
 
-from . import account
-from . import currency
-from . import purchase
-from . import sale
+from . import account, currency, purchase, sale
 
 __all__ = ['register']
 
diff --git a/account.py b/account.py
index c7d55e1584..94ed559c39 100644
--- a/account.py
+++ b/account.py
@@ -4,12 +4,11 @@ from decimal import Decimal
 
 from trytond.i18n import gettext
 from trytond.model import ModelSQL, fields
-from trytond.pool import PoolMeta, Pool
-from trytond.pyson import Eval
-
 from trytond.modules.account.exceptions import AccountMissing
 from trytond.modules.account_invoice.exceptions import PaymentTermComputeError
 from trytond.modules.company.model import CompanyValueMixin
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Eval
 
 
 class Configuration(metaclass=PoolMeta):
diff --git a/purchase.py b/purchase.py
index 1b453fc9a9..0f5bfe1874 100644
--- a/purchase.py
+++ b/purchase.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.
 from trytond.model import fields
+from trytond.modules.account_invoice.exceptions import PaymentTermComputeError
 from trytond.pool import PoolMeta
 from trytond.pyson import Eval
 from trytond.transaction import Transaction
 
-from trytond.modules.account_invoice.exceptions import PaymentTermComputeError
-
 
 class Purchase(metaclass=PoolMeta):
     __name__ = 'purchase.purchase'
diff --git a/sale.py b/sale.py
index 2466a90a43..9df9fe3006 100644
--- a/sale.py
+++ b/sale.py
@@ -1,9 +1,8 @@
 # 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 import fields
-from trytond.pool import PoolMeta, Pool
-
 from trytond.modules.account_invoice.exceptions import PaymentTermComputeError
+from trytond.pool import Pool, PoolMeta
 
 
 class Sale(metaclass=PoolMeta):
diff --git a/setup.py b/setup.py
index 4e6deff286..ab25f58f43 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, slice=None):
diff --git a/tests/__init__.py b/tests/__init__.py
index 64dc152b7f..cc51342dd0 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.account_cash_rounding.tests.test_account_cash_rounding import suite  # noqa: E501
+    from trytond.modules.account_cash_rounding.tests.test_account_cash_rounding import \
+        suite  # noqa: E501
 except ImportError:
     from .test_account_cash_rounding import suite
 
diff --git a/tests/test_account_cash_rounding.py b/tests/test_account_cash_rounding.py
index 3497d4bd63..060b4e1f78 100644
--- a/tests/test_account_cash_rounding.py
+++ b/tests/test_account_cash_rounding.py
@@ -1,14 +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 doctest
 import unittest
 
-import doctest
-
-from trytond.tests.test_tryton import ModuleTestCase
+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 doctest_teardown
-from trytond.tests.test_tryton import doctest_checker
 
 
 class AccountCashRoundingTestCase(ModuleTestCase):