diff --git a/.flake8 b/.flake8
new file mode 100644
index 0000000000..bb03d08a82
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,2 @@
+[flake8]
+ignore=E123,E124,E126,E128,W503
diff --git a/__init__.py b/__init__.py
index 40c47bd873..8563c2a257 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,11 +2,11 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-from .purchase import *
+from . import purchase
 
 
 def register():
     Pool.register(
-        ProductSupplier,
-        ProductSupplierDay,
+        purchase.ProductSupplier,
+        purchase.ProductSupplierDay,
         module='stock_supply_day', type_='model')
diff --git a/purchase.py b/purchase.py
index e8432f0dbe..a159f57473 100644
--- a/purchase.py
+++ b/purchase.py
@@ -5,8 +5,6 @@ from trytond.model import ModelSQL, fields
 from trytond.pool import PoolMeta, Pool
 from trytond.transaction import Transaction
 
-__all__ = ['ProductSupplier', 'ProductSupplierDay']
-
 
 class ProductSupplier(metaclass=PoolMeta):
     __name__ = 'purchase.product_supplier'
diff --git a/setup.py b/setup.py
index b67c859cf7..89f992693c 100755
--- a/setup.py
+++ b/setup.py
@@ -78,8 +78,8 @@ setup(name=name,
     keywords='tryton supply day',
     package_dir={'trytond.modules.stock_supply_day': '.'},
     packages=(
-        ['trytond.modules.stock_supply_day'] +
-        ['trytond.modules.stock_supply_day.%s' % p for p in find_packages()]
+        ['trytond.modules.stock_supply_day']
+        + ['trytond.modules.stock_supply_day.%s' % p for p in find_packages()]
         ),
     package_data={
         'trytond.modules.stock_supply_day': (info.get('xml', [])
@@ -92,7 +92,8 @@ setup(name=name,
         'Intended Audience :: Developers',
         'Intended Audience :: Legal Industry',
         'Intended Audience :: Manufacturing',
-        'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
+        'License :: OSI Approved :: '
+        'GNU General Public License v3 or later (GPLv3+)',
         'Natural Language :: Bulgarian',
         'Natural Language :: Catalan',
         'Natural Language :: Chinese (Simplified)',
diff --git a/tests/__init__.py b/tests/__init__.py
index 49e13d583a..95dae419ff 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -2,7 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 
 try:
-    from trytond.modules.stock_supply_day.tests.test_stock_supply_day import suite
+    from trytond.modules.stock_supply_day.tests.test_stock_supply_day import suite  # noqa: E501
 except ImportError:
     from .test_stock_supply_day import suite