diff --git a/ckanext/privatedatasets/actions.py b/ckanext/privatedatasets/actions.py
index ff26762..e839395 100644
--- a/ckanext/privatedatasets/actions.py
+++ b/ckanext/privatedatasets/actions.py
@@ -17,12 +17,16 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with CKAN Private Dataset Extension.  If not, see <http://www.gnu.org/licenses/>.
 
-import ckan.plugins as plugins
-import ckanext.privatedatasets.constants as constants
-import db
+from __future__ import absolute_import
+
 import importlib
 import logging
 
+import ckan.plugins as plugins
+
+from ckanext.privatedatasets import constants, db
+
+
 log = logging.getLogger(__name__)
 
 PARSER_CONFIG_PROP = 'ckan.privatedatasets.parser'
@@ -54,6 +58,7 @@ def package_acquired(context, request_data):
     context['method'] = 'grant'
     return _process_package(context, request_data)
 
+
 def acquisitions_list(context, data_dict):
     '''
     API to retrieve the list of datasets that have been acquired by a certain user
@@ -137,6 +142,7 @@ def revoke_access(context, request_data):
     context['method'] = 'revoke'
     return _process_package(context, request_data)
 
+
 def _process_package(context, request_data):
     log.info('Notification received: %s' % request_data)
 
@@ -168,7 +174,7 @@ def _process_package(context, request_data):
 
     for user_info in result['users_datasets']:
         for dataset_id in user_info['datasets']:
-            
+
             try:
                 context_pkg_show = context.copy()
                 context_pkg_show['ignore_auth'] = True
diff --git a/ckanext/privatedatasets/auth.py b/ckanext/privatedatasets/auth.py
index cb2c5c1..204b999 100644
--- a/ckanext/privatedatasets/auth.py
+++ b/ckanext/privatedatasets/auth.py
@@ -17,16 +17,15 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with CKAN Private Dataset Extension.  If not, see <http://www.gnu.org/licenses/>.
 
+from __future__ import absolute_import
+
+import ckan.authz as authz
+from ckan.common import _, request
 import ckan.lib.helpers as helpers
 import ckan.logic.auth as logic_auth
 import ckan.plugins.toolkit as tk
-try:
-    import ckan.authz as authz
-except ImportError:
-    import ckan.new_authz as authz
-import db
 
-from ckan.common import _, request
+from ckanext.privatedatasets import db
 
 
 @tk.auth_allow_anonymous_access
@@ -137,11 +136,13 @@ def package_acquired(context, data_dict):
     # TODO: Improve security
     return {'success': True}
 
+
 def acquisitions_list(context, data_dict):
     # Users can get only their acquisitions list
     return {'success': context['user'] == data_dict['user']}
 
+
 @tk.auth_allow_anonymous_access
 def revoke_access(context, data_dict):
     # TODO: Check functionality and improve security(if needed)
-    return {'success': True}
\ No newline at end of file
+    return {'success': True}
diff --git a/ckanext/privatedatasets/converters_validators.py b/ckanext/privatedatasets/converters_validators.py
index 83e3547..26ea1c4 100644
--- a/ckanext/privatedatasets/converters_validators.py
+++ b/ckanext/privatedatasets/converters_validators.py
@@ -17,13 +17,16 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with CKAN Private Dataset Extension.  If not, see <http://www.gnu.org/licenses/>.
 
-import constants
-import db
+from __future__ import absolute_import
+
+from itertools import count
 import re
 
 from ckan.plugins import toolkit
 from ckan.common import _
-from itertools import count
+import six
+
+from ckanext.privatedatasets import constants, db
 
 
 def private_datasets_metadata_checker(key, data, errors, context):
@@ -33,7 +36,7 @@ def private_datasets_metadata_checker(key, data, errors, context):
 
     # Avoid missing value
     # "if not private_val:" is not valid because private_val can be False
-    if not isinstance(private_val, basestring) and not isinstance(private_val, bool):
+    if not isinstance(private_val, six.string_types) and not isinstance(private_val, bool):
         private_val = None
 
     # If the private field is not included in the data dict, we must check the current value
@@ -57,7 +60,7 @@ def allowed_users_convert(key, data, errors, context):
     # Get the allowed user list
     if (constants.ALLOWED_USERS,) in data and isinstance(data[(constants.ALLOWED_USERS,)], list):
         allowed_users = data[(constants.ALLOWED_USERS,)]
-    elif (constants.ALLOWED_USERS_STR,) in data and isinstance(data[(constants.ALLOWED_USERS_STR,)], basestring):
+    elif (constants.ALLOWED_USERS_STR,) in data and isinstance(data[(constants.ALLOWED_USERS_STR,)], six.string_types):
         allowed_users_str = data[(constants.ALLOWED_USERS_STR,)].strip()
         allowed_users = [allowed_user for allowed_user in allowed_users_str.split(',') if allowed_user.strip() != '']
     else:
diff --git a/ckanext/privatedatasets/db.py b/ckanext/privatedatasets/db.py
index b1b38f1..b0fa04c 100644
--- a/ckanext/privatedatasets/db.py
+++ b/ckanext/privatedatasets/db.py
@@ -17,6 +17,8 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with CKAN Private Dataset Extension.  If not, see <http://www.gnu.org/licenses/>.
 
+from __future__ import absolute_import
+
 import sqlalchemy as sa
 
 AllowedUser = None
@@ -38,7 +40,9 @@ def init_db(model):
         AllowedUser = _AllowedUser
 
         # FIXME: Maybe a default value should not be included...
-        package_allowed_users_table = sa.Table('package_allowed_users', model.meta.metadata,
+        package_allowed_users_table = sa.Table(
+            'package_allowed_users',
+            model.meta.metadata,
             sa.Column('package_id', sa.types.UnicodeText, primary_key=True, default=u''),
             sa.Column('user_name', sa.types.UnicodeText, primary_key=True, default=u''),
         )
diff --git a/ckanext/privatedatasets/helpers.py b/ckanext/privatedatasets/helpers.py
index 4c371ca..ad2b455 100755
--- a/ckanext/privatedatasets/helpers.py
+++ b/ckanext/privatedatasets/helpers.py
@@ -17,13 +17,17 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with CKAN Private Dataset Extension.  If not, see <http://www.gnu.org/licenses/>.
 
-import ckan.model as model
-import ckan.plugins.toolkit as tk
-import db
-
-from ckan.common import request
+from __future__ import absolute_import
 
 import logging
+
+from ckan.common import request
+import ckan.model as model
+import ckan.plugins.toolkit as tk
+
+from ckanext.privatedatasets import db
+
+
 log = logging.getLogger(__name__)
 
 
diff --git a/ckanext/privatedatasets/parsers/fiware.py b/ckanext/privatedatasets/parsers/fiware.py
index f5cec78..5ea9894 100644
--- a/ckanext/privatedatasets/parsers/fiware.py
+++ b/ckanext/privatedatasets/parsers/fiware.py
@@ -17,11 +17,12 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with CKAN Private Dataset Extension.  If not, see <http://www.gnu.org/licenses/>.
 
-import ckan.plugins.toolkit as tk
 import re
-
 from urlparse import urlparse
+
 from ckan.common import request
+import ckan.plugins.toolkit as tk
+import six
 
 
 class FiWareNotificationParser(object):
@@ -32,7 +33,7 @@ class FiWareNotificationParser(object):
         fields = ['customer_name', 'resources']
 
         for field in fields:
-            if not field in request_data:
+            if field not in request_data:
                 raise tk.ValidationError({'message': '%s not found in the request' % field})
 
         # Parse the body
@@ -40,7 +41,7 @@ class FiWareNotificationParser(object):
         user_name = request_data['customer_name']
         datasets = []
 
-        if not isinstance(user_name, basestring):
+        if not isinstance(user_name, six.string_types):
             raise tk.ValidationError({'message': 'Invalid customer_name format'})
 
         if not isinstance(resources, list):
@@ -61,4 +62,3 @@ class FiWareNotificationParser(object):
                 raise tk.ValidationError({'message': 'Invalid resource format'})
 
         return {'users_datasets': [{'user': user_name, 'datasets': datasets}]}
-        
\ No newline at end of file
diff --git a/ckanext/privatedatasets/plugin.py b/ckanext/privatedatasets/plugin.py
index 0ab370e..38ba9a8 100755
--- a/ckanext/privatedatasets/plugin.py
+++ b/ckanext/privatedatasets/plugin.py
@@ -17,19 +17,14 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with CKAN Private Dataset Extension.  If not, see <http://www.gnu.org/licenses/>.
 
-import ckan.lib.search as search
-import ckan.model as model
-import ckan.plugins as p
-import ckan.plugins.toolkit as tk
+from __future__ import absolute_import
 
+from ckan import model, plugins as p
+from ckan.lib import search
 from ckan.lib.plugins import DefaultPermissionLabels
+from ckan.plugins import toolkit as tk
 
-import auth
-import actions
-import constants
-import converters_validators as conv_val
-import db
-import helpers as helpers
+from ckanext.privatedatasets import auth, actions, constants, converters_validators as conv_val, db, helpers
 
 
 HIDDEN_FIELDS = [constants.ALLOWED_USERS, constants.SEARCHABLE]
@@ -150,8 +145,6 @@ class PrivateDatasets(p.SingletonPlugin, tk.DefaultDatasetForm, DefaultPermissio
 
         return m
 
-    
-
     ######################################################################
     ############################## IACTIONS ##############################
     ######################################################################
@@ -270,7 +263,7 @@ class PrivateDatasets(p.SingletonPlugin, tk.DefaultDatasetForm, DefaultPermissio
 
     def after_search(self, search_results, search_params):
         for result in search_results['results']:
-            # Extra fields should not be returned 
+            # Extra fields should not be returned
             # The original list cannot be modified
             attrs = list(HIDDEN_FIELDS)