diff --git a/beat/web/libraries/tests/tests_api.py b/beat/web/libraries/tests/tests_api.py
index 3d1a817c5d03595f34053c42489f4451c02980b4..b97d1230c7a99e0ef934dcd7ceda2981077a0a26 100644
--- a/beat/web/libraries/tests/tests_api.py
+++ b/beat/web/libraries/tests/tests_api.py
@@ -59,13 +59,13 @@ class LibrariesListRetrieval(LibrariesAPIBase):
         self.assertEqual(library['short_description'], '')
         self.assertTrue(library['fork_of'] is None)
         self.assertEqual(library['accessibility'], 'public')
-        self.assertFalse(library.has_key('is_owner'))
+        self.assertFalse('is_owner' in library)
 
         library = filter(lambda x: x['name'] == 'jackdoe/usable_by_all/1', content)[0]
         self.assertEqual(library['short_description'], '')
         self.assertTrue(library['fork_of'] is None)
         self.assertEqual(library['accessibility'], 'confidential')
-        self.assertFalse(library.has_key('is_owner'))
+        self.assertFalse('is_owner' in library)
 
 
     def test_all_accessible_libraries(self):
@@ -913,7 +913,7 @@ class LibraryRetrieval(LibrariesAPIBase):
         self.assertEqual(data['accessibility'], 'public')
         self.assertTrue(data['opensource'])
         self.assertEqual(data['description'], '')
-        self.assertFalse(data.has_key('is_owner'))
+        self.assertFalse('is_owner' in data)
 
         self.assertEqual(data['declaration'], LibrariesAPIBase.JSON_DECLARATION)
         self.assertEqual(data['code'], LibrariesAPIBase.CODE)
@@ -926,8 +926,8 @@ class LibraryRetrieval(LibrariesAPIBase):
         self.assertEqual(data['accessibility'], 'confidential')
         self.assertFalse(data['opensource'])
         self.assertEqual(data['description'], '')
-        self.assertFalse(data.has_key('code'))
-        self.assertFalse(data.has_key('is_owner'))
+        self.assertFalse('code' in data)
+        self.assertFalse('is_owner' in data)
 
 
     def test_successful_retrieval_of_public_library(self):
@@ -957,7 +957,7 @@ class LibraryRetrieval(LibrariesAPIBase):
         self.assertEqual(data['accessibility'], 'confidential')
         self.assertFalse(data['opensource'])
         self.assertEqual(data['description'], '')
-        self.assertFalse(data.has_key('code'))
+        self.assertFalse('code' in data)
 
 
     def test_successful_retrieval_of_publicly_usable_library(self):
@@ -971,7 +971,7 @@ class LibraryRetrieval(LibrariesAPIBase):
         self.assertEqual(data['accessibility'], 'confidential')
         self.assertFalse(data['opensource'])
         self.assertEqual(data['description'], '')
-        self.assertFalse(data.has_key('code'))
+        self.assertFalse('code' in data)
 
 
     def test_successful_retrieval_of_confidential_library(self):
@@ -1007,8 +1007,8 @@ class LibraryRetrieval(LibrariesAPIBase):
 
         self.assertTrue(isinstance(data['sharing'], dict))
         self.assertEqual(data['sharing']['status'], 'public')
-        self.assertFalse(data['sharing'].has_key('public_users'))
-        self.assertFalse(data['sharing'].has_key('usable_users'))
+        self.assertFalse('public_users' in data['sharing'])
+        self.assertFalse('usable_users' in data['sharing'])
 
 
     def test_successful_retrieval_of_own_confidential_library(self):
@@ -1049,8 +1049,8 @@ class LibraryRetrieval(LibrariesAPIBase):
 
         self.assertTrue(isinstance(data['sharing'], dict))
         self.assertEqual(data['sharing']['status'], 'usable')
-        self.assertFalse(data['sharing'].has_key('shared_with'))
-        self.assertFalse(data['sharing'].has_key('usable_users'))
+        self.assertFalse('shared_with' in data['sharing'])
+        self.assertFalse('usable_users' in data['sharing'])
 
 
     def test_successful_retrieval_of_own_shared_library(self):
@@ -1071,7 +1071,7 @@ class LibraryRetrieval(LibrariesAPIBase):
         self.assertTrue(isinstance(data['sharing'], dict))
         self.assertEqual(data['sharing']['status'], 'shared')
         self.assertEqual(data['sharing']['shared_with'], ['johndoe'])
-        self.assertFalse(data['sharing'].has_key('usable_by'))
+        self.assertFalse('usable_by' in data['sharing'])
 
 
 
@@ -1121,7 +1121,7 @@ class LibrarySharingAPIBase(LibrariesAPIBase):
         self.assertEqual(len(sharing_preferences.keys()), len(reference.keys()))
 
         for (key, value) in reference.items():
-            self.assertTrue(sharing_preferences.has_key(key))
+            self.assertTrue(key in sharing_preferences)
 
             if isinstance(value, list):
                 self.assertEqual(len(sharing_preferences[key]), len(value))