diff --git a/addons/payment_buckaroo/models/payment.py b/addons/payment_buckaroo/models/payment.py
index 05e0c314921..2235226769f 100644
--- a/addons/payment_buckaroo/models/payment.py
+++ b/addons/payment_buckaroo/models/payment.py
@@ -71,7 +71,7 @@ class AcquirerBuckaroo(models.Model):
                     del values[key]
                     break
 
-            items = sorted(values.items(), key=lambda (x, y): x.lower())
+            items = sorted(values.items(), key=lambda pair: pair[0].lower())
             sign = ''.join('%s=%s' % (k, urllib.unquote_plus(v)) for k, v in items)
         else:
             sign = ''.join('%s=%s' % (k, get_value(k)) for k in keys)
diff --git a/odoo/addons/base/res/res_users.py b/odoo/addons/base/res/res_users.py
index 978fb6f4024..db1e17863d2 100644
--- a/odoo/addons/base/res/res_users.py
+++ b/odoo/addons/base/res/res_users.py
@@ -780,7 +780,7 @@ class GroupsView(models.Model):
                 others += g
         # build the result
         res = []
-        for app, gs in sorted(by_app.iteritems(), key=lambda (a, _): a.sequence or 0):
+        for app, gs in sorted(by_app.iteritems(), key=lambda it: it[0].sequence or 0):
             res.append(linearize(app, gs))
         if others:
             res.append((self.env['ir.module.category'], 'boolean', others))