diff --git a/__init__.py b/__init__.py
index 65d8f6a2c5..21ba638c87 100644
--- a/__init__.py
+++ b/__init__.py
@@ -1,5 +1,5 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of this
-#repository contains the full copyright notices and license terms.
+# 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.pool import Pool
 from .stock import *
diff --git a/setup.py b/setup.py
index c0234d9542..66194030d4 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
-#This file is part of Tryton.  The COPYRIGHT file at the top level of
-#this repository contains the full copyright notices and license terms.
+# 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 setuptools import setup
 import re
diff --git a/stock.py b/stock.py
index bd4ef8816f..50ac5d41f5 100644
--- a/stock.py
+++ b/stock.py
@@ -1,5 +1,5 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of this
-#repository contains the full copyright notices and license terms.
+# 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 ModelSQL, ModelView, Workflow, fields
 from trytond.pool import Pool, PoolMeta
diff --git a/tests/__init__.py b/tests/__init__.py
index e9111b2b25..648f60e3ae 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,4 +1,6 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of
-#this repository contains the full copyright notices and license terms.
+# 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 .test_stock_package import suite
+
+__all__ = ['suite']
diff --git a/tests/test_stock_package.py b/tests/test_stock_package.py
index deba2b5a23..49337583d8 100644
--- a/tests/test_stock_package.py
+++ b/tests/test_stock_package.py
@@ -1,5 +1,5 @@
-#This file is part of Tryton.  The COPYRIGHT file at the top level of
-#this repository contains the full copyright notices and license terms.
+# 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 trytond.tests.test_tryton