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/purchase.py b/purchase.py
index f940eeaaaf..17fc640fc9 100644
--- a/purchase.py
+++ b/purchase.py
@@ -17,13 +17,6 @@ from trytond.wizard import Wizard, StateView, StateTransition, Button
 from .exceptions import PreviousQuotation
 
 
-__all__ = ['Configuration', 'ConfigurationSequence', 'Quotation',
-    'QuotationLine', 'CreatePurchaseRequestQuotationAskSuppliers',
-    'CreatePurchaseRequestQuotationSucceed', 'PurchaseRequest',
-    'CreatePurchaseRequestQuotation', 'CreatePurchase',
-    'PurchaseRequestQuotationReport']
-
-
 def process_request(func):
     @wraps(func)
     def wrapper(cls, quotations):
@@ -625,7 +618,8 @@ class CreatePurchase(Wizard):
         to_save = []
         requests = Request.browse(Transaction().context['active_ids'])
 
-        reqs = [r for r in requests if not r.purchase_line and r.quotation_lines]
+        reqs = [r for r in requests
+            if not r.purchase_line and r.quotation_lines]
         to_save = []
         for req in reqs:
             if req.best_quotation_line:
diff --git a/setup.py b/setup.py
index 93d541cdc4..93ff85628f 100755
--- a/setup.py
+++ b/setup.py
@@ -83,8 +83,8 @@ setup(name=name,
     keywords='tryton purchase request for quotation',
     package_dir={'trytond.modules.purchase_request_quotation': '.'},
     packages=(
-        ['trytond.modules.purchase_request_quotation'] +
-        ['trytond.modules.purchase_request_quotation.%s' % p
+        ['trytond.modules.purchase_request_quotation']
+        + ['trytond.modules.purchase_request_quotation.%s' % p
             for p in find_packages()]
         ),
     package_data={
diff --git a/tests/__init__.py b/tests/__init__.py
index 99939d88de..d872341b0f 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -3,7 +3,7 @@
 # the full copyright notices and license terms.
 
 try:
-    from trytond.modules.purchase_request_quotation.tests.test_purchase_request_quotation import suite
+    from trytond.modules.purchase_request_quotation.tests.test_purchase_request_quotation import suite  # noqa: E501
 except ImportError:
     from .test_purchase_request_quotation import suite