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 bc56d55dd0..78da1b6ee0 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 party
-from . import sale
+
+from . import party, sale
 
 
 def register():
diff --git a/setup.py b/setup.py
index fcae5e0be1..3ecf0662a0 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 7cfaf1e3a4..fbf3070213 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_credit_limit.tests.test_sale_credit_limit import suite  # noqa: E501
+    from trytond.modules.sale_credit_limit.tests.test_sale_credit_limit import \
+        suite  # noqa: E501
 except ImportError:
     from .test_sale_credit_limit import suite
 
diff --git a/tests/test_sale_credit_limit.py b/tests/test_sale_credit_limit.py
index 9f0b35baad..3d4c71a863 100644
--- a/tests/test_sale_credit_limit.py
+++ b/tests/test_sale_credit_limit.py
@@ -2,15 +2,15 @@
 # this repository contains the full copyright notices and license terms.
 import unittest
 from decimal import Decimal
-import trytond.tests.test_tryton
-from trytond.tests.test_tryton import ModuleTestCase, with_transaction
-from trytond.pool import Pool
-from trytond.exceptions import UserWarning
 
-from trytond.modules.company.tests import (
-    create_company, set_company, CompanyTestMixin)
+import trytond.tests.test_tryton
+from trytond.exceptions import UserWarning
 from trytond.modules.account.tests import create_chart, get_fiscalyear
 from trytond.modules.account_invoice.tests import set_invoice_sequences
+from trytond.modules.company.tests import (
+    CompanyTestMixin, create_company, set_company)
+from trytond.pool import Pool
+from trytond.tests.test_tryton import ModuleTestCase, with_transaction
 
 
 class SaleCreditLimitTestCase(CompanyTestMixin, ModuleTestCase):