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 0c86b0e706..a924298066 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,13 +2,9 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-from . import sale
-from . import product
-from . import stock
-from . import configuration
-from . import invoice
-from . import party
-from . import sale_reporting
+
+from . import (
+    configuration, invoice, party, product, sale, sale_reporting, stock)
 
 
 def register():
diff --git a/configuration.py b/configuration.py
index 6a1ec87a77..01712faa08 100644
--- a/configuration.py
+++ b/configuration.py
@@ -1,13 +1,13 @@
 # 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 import backend
-from trytond.model import (ModelView, ModelSQL, ModelSingleton, ValueMixin,
-    fields)
+from trytond.model import (
+    ModelSingleton, ModelSQL, ModelView, ValueMixin, fields)
+from trytond.modules.company.model import (
+    CompanyMultiValueMixin, CompanyValueMixin)
 from trytond.pool import Pool
 from trytond.pyson import Eval, Id
 from trytond.tools.multivalue import migrate_property
-from trytond.modules.company.model import (
-    CompanyMultiValueMixin, CompanyValueMixin)
 
 sale_invoice_method = fields.Selection(
     'get_sale_invoice_methods', "Sale Invoice Method")
diff --git a/party.py b/party.py
index 3ddb07612b..58f4ce4f39 100644
--- a/party.py
+++ b/party.py
@@ -2,13 +2,12 @@
 # this repository contains the full copyright notices and license terms.
 from trytond.i18n import gettext
 from trytond.model import ModelSQL, fields
-from trytond.pool import PoolMeta, Pool
-from trytond.pyson import Eval
-from trytond.transaction import Transaction
-
 from trytond.modules.company.model import (
     CompanyMultiValueMixin, CompanyValueMixin)
 from trytond.modules.party.exceptions import EraseError
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Eval
+from trytond.transaction import Transaction
 
 
 def get_sale_methods(field_name):
diff --git a/product.py b/product.py
index fbc76892a2..11e5eedd2e 100644
--- a/product.py
+++ b/product.py
@@ -3,12 +3,12 @@
 import datetime
 
 from trytond.model import ModelSQL, ModelView, fields
-from trytond.pyson import Eval
-from trytond.pool import Pool, PoolMeta
-from trytond.transaction import Transaction
 from trytond.modules.company.model import CompanyValueMixin
 from trytond.modules.currency.fields import Monetary
 from trytond.modules.product import price_digits
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Eval
+from trytond.transaction import Transaction
 
 
 class Configuration(metaclass=PoolMeta):
diff --git a/sale.py b/sale.py
index 497ca269bb..56c4c7ef35 100644
--- a/sale.py
+++ b/sale.py
@@ -3,32 +3,31 @@
 import datetime
 from collections import defaultdict
 from decimal import Decimal
-from itertools import groupby, chain
 from functools import partial
+from itertools import chain, groupby
 
 from trytond.i18n import gettext
-from trytond.model import Workflow, Model, ModelView, ModelSQL, fields, \
-    sequence_ordered, Unique
-from trytond.model.exceptions import AccessError
-from trytond.modules.company import CompanyReport
-from trytond.wizard import Wizard, StateAction, StateView, StateTransition, \
-    Button
-from trytond.pyson import If, Eval, Bool, PYSONEncoder
-from trytond.transaction import Transaction
-from trytond.tools import sortable_values, firstline
-from trytond.pool import Pool
-
 from trytond.ir.attachment import AttachmentCopyMixin
 from trytond.ir.note import NoteCopyMixin
+from trytond.model import (
+    Model, ModelSQL, ModelView, Unique, Workflow, fields, sequence_ordered)
+from trytond.model.exceptions import AccessError
 from trytond.modules.account.tax import TaxableMixin
 from trytond.modules.account_product.exceptions import AccountError
+from trytond.modules.company import CompanyReport
 from trytond.modules.company.model import (
-    employee_field, set_employee, reset_employee)
+    employee_field, reset_employee, set_employee)
 from trytond.modules.currency.fields import Monetary
 from trytond.modules.product import price_digits, round_price
+from trytond.pool import Pool
+from trytond.pyson import Bool, Eval, If, PYSONEncoder
+from trytond.tools import firstline, sortable_values
+from trytond.transaction import Transaction
+from trytond.wizard import (
+    Button, StateAction, StateTransition, StateView, Wizard)
 
 from .exceptions import (
-    SaleValidationError, SaleQuotationError, PartyLocationError)
+    PartyLocationError, SaleQuotationError, SaleValidationError)
 
 
 def get_shipments_returns(model_name):
diff --git a/sale_reporting.py b/sale_reporting.py
index fd7fed28ae..9da6a1d106 100644
--- a/sale_reporting.py
+++ b/sale_reporting.py
@@ -8,20 +8,19 @@ try:
 except ImportError:
     pygal = None
 from dateutil.relativedelta import relativedelta
-from sql import Null, Literal, Column, With
-from sql.aggregate import Sum, Max, Min, Count
+from sql import Column, Literal, Null, With
+from sql.aggregate import Count, Max, Min, Sum
 from sql.conditionals import Coalesce
-from sql.functions import CurrentTimestamp, DateTrunc, Power, Ceil, Log
+from sql.functions import Ceil, CurrentTimestamp, DateTrunc, Log, Power
 
-from trytond.pool import Pool
+from trytond.i18n import lazy_gettext
 from trytond.model import ModelSQL, ModelView, UnionMixin, fields
+from trytond.modules.currency.fields import Monetary
+from trytond.pool import Pool
+from trytond.pyson import Eval, If
 from trytond.tools import grouped_slice, reduce_ids
 from trytond.transaction import Transaction
-from trytond.pyson import Eval, If
-from trytond.wizard import Wizard, StateTransition, StateAction
-from trytond.i18n import lazy_gettext
-
-from trytond.modules.currency.fields import Monetary
+from trytond.wizard import StateAction, StateTransition, Wizard
 
 
 def pairwise(iterable):
diff --git a/setup.py b/setup.py
index bff76c956b..f2522c30d0 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/stock.py b/stock.py
index b461142a04..833e75702f 100644
--- a/stock.py
+++ b/stock.py
@@ -4,12 +4,11 @@ from decimal import Decimal
 from functools import wraps
 
 from trytond.i18n import gettext
-from trytond.model import Workflow, ModelView, fields
+from trytond.model import ModelView, Workflow, fields
 from trytond.model.exceptions import AccessError
-from trytond.transaction import Transaction
-from trytond.pool import Pool, PoolMeta
-
 from trytond.modules.product import round_price
+from trytond.pool import Pool, PoolMeta
+from trytond.transaction import Transaction
 
 
 def process_sale(moves_field):
diff --git a/tests/test_sale.py b/tests/test_sale.py
index 0fa1d57b20..10f449ec88 100644
--- a/tests/test_sale.py
+++ b/tests/test_sale.py
@@ -1,18 +1,17 @@
 # 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 decimal import Decimal
 
 import trytond.tests.test_tryton
-from trytond.tests.test_tryton import ModuleTestCase, with_transaction
-from trytond.tests.test_tryton import doctest_teardown, doctest_checker
-from trytond.transaction import Transaction
-from trytond.pool import Pool
-
 from trytond.modules.account.tests import create_chart
 from trytond.modules.company.tests import (
-    create_company, set_company, PartyCompanyCheckEraseMixin, CompanyTestMixin)
+    CompanyTestMixin, PartyCompanyCheckEraseMixin, create_company, set_company)
+from trytond.pool import Pool
+from trytond.tests.test_tryton import (
+    ModuleTestCase, doctest_checker, doctest_teardown, with_transaction)
+from trytond.transaction import Transaction
 
 
 class SaleTestCase(