diff --git a/purchase.py b/purchase.py
index 6643431266..98541c560b 100644
--- a/purchase.py
+++ b/purchase.py
@@ -50,8 +50,8 @@ class PurchaseLine(ModelSQL, ModelView):
     def _view_look_dom_arch(self, tree, type, field_children=None):
         analytic_account_obj = Pool().get('analytic_account.account')
         analytic_account_obj.convert_view(tree)
-        arch, fields = super(PurchaseLine, self)._view_look_dom_arch(tree, type,
-            field_children=field_children)
+        arch, fields = super(PurchaseLine, self)._view_look_dom_arch(tree,
+            type, field_children=field_children)
         return arch, fields
 
     def fields_get(self, fields_names=None):
@@ -214,7 +214,8 @@ class PurchaseLine(ModelSQL, ModelView):
         return new_ids
 
     def get_invoice_line(self, line):
-        account_selection_obj = Pool().get('analytic_account.account.selection')
+        pool = Pool()
+        account_selection_obj = pool.get('analytic_account.account.selection')
 
         res = super(PurchaseLine, self).get_invoice_line(line)
         if not res:
@@ -222,7 +223,8 @@ class PurchaseLine(ModelSQL, ModelView):
 
         selection_id = False
         if line.analytic_accounts:
-            selection_id = account_selection_obj.copy(line.analytic_accounts.id)
+            selection_id = account_selection_obj.copy(
+                line.analytic_accounts.id)
         for vals in res:
             vals['analytic_accounts'] = selection_id
         return res
diff --git a/tests/test_analytic_purchase.py b/tests/test_analytic_purchase.py
index 5a575de835..9a9f46b365 100644
--- a/tests/test_analytic_purchase.py
+++ b/tests/test_analytic_purchase.py
@@ -2,7 +2,8 @@
 #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 sys, os
+import sys
+import os
 DIR = os.path.abspath(os.path.normpath(os.path.join(__file__,
     '..', '..', '..', '..', '..', 'trytond')))
 if os.path.isdir(DIR):
@@ -33,6 +34,7 @@ class AnalyticPurchaseTestCase(unittest.TestCase):
         '''
         test_depends()
 
+
 def suite():
     suite = trytond.tests.test_tryton.suite()
     suite.addTests(unittest.TestLoader().loadTestsFromTestCase(