diff --git a/__init__.py b/__init__.py
index 8128dfaee5..770e1ae733 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 account import *
diff --git a/account.py b/account.py
index d735193a02..952ee74a7e 100644
--- a/account.py
+++ b/account.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 decimal import Decimal
 
 from trytond.model import fields
diff --git a/party.py b/party.py
index 9e2407a96a..b11e2272e6 100644
--- a/party.py
+++ b/party.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 fields
 from trytond.pool import Pool, PoolMeta
 from trytond.transaction import Transaction
diff --git a/setup.py b/setup.py
index e884e8011c..8a16a05de1 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/tests/__init__.py b/tests/__init__.py
index ebb3d4aa30..6ec40fdb45 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_account_credit_limit import suite
+
+__all__ = ['suite']
diff --git a/tests/test_account_credit_limit.py b/tests/test_account_credit_limit.py
index 899fc922d0..b19526ffef 100644
--- a/tests/test_account_credit_limit.py
+++ b/tests/test_account_credit_limit.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
 from decimal import Decimal
 import trytond.tests.test_tryton