diff --git a/ec2api_tempest_plugin/scenario/test_paging.py b/ec2api_tempest_plugin/scenario/test_paging.py
index 9aaa0e9..e01f20f 100644
--- a/ec2api_tempest_plugin/scenario/test_paging.py
+++ b/ec2api_tempest_plugin/scenario/test_paging.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from six.moves import range
 import time
 
 import botocore.exceptions
@@ -48,7 +49,7 @@ class TagsPagingTest(scenario_base.BaseScenarioTest):
         self.get_volume_waiter().wait_available(volume_id)
 
         keys = list()
-        for dummy in xrange(0, self.TAGS_COUNT):
+        for dummy in range(0, self.TAGS_COUNT):
             key = data_utils.rand_name('key')
             value = 'aaa' if dummy < 6 else 'bbb'
             data = self.client.create_tags(Resources=[volume_id],
@@ -167,7 +168,7 @@ class VolumesPagingTest(scenario_base.BaseScenarioTest):
 
         zone = CONF.aws.aws_zone
         cls.ids = list()
-        for dummy in xrange(0, cls.VOLUMES_COUNT):
+        for dummy in range(0, cls.VOLUMES_COUNT):
             data = cls.client.create_volume(Size=1, AvailabilityZone=zone)
             volume_id = data['VolumeId']
             cls.addResourceCleanUpStatic(cls.client.delete_volume,
@@ -338,7 +339,7 @@ class InstancePagingTest(scenario_base.BaseScenarioTest):
             'MinCount': cls.INSTANCES_IN_RESERVATIONS_COUNT,
             'MaxCount': cls.INSTANCES_IN_RESERVATIONS_COUNT
         }
-        for dummy in xrange(0, cls.RESERVATIONS_COUNT):
+        for dummy in range(0, cls.RESERVATIONS_COUNT):
             data = cls.client.run_instances(*[], **kwargs)
             for instance in data['Instances']:
                 cls.ids.append(instance['InstanceId'])
diff --git a/ec2api_tempest_plugin/scenario/test_vpn.py b/ec2api_tempest_plugin/scenario/test_vpn.py
index 6263a0c..64a6bf4 100644
--- a/ec2api_tempest_plugin/scenario/test_vpn.py
+++ b/ec2api_tempest_plugin/scenario/test_vpn.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import os
+import six
 import sys
 import time
 import urllib2
@@ -162,7 +163,7 @@ class VpnTest(scenario_base.BaseScenarioTest):
                 LOG.warning(output)
             except Exception:
                 pass
-            raise exc_info[1], None, exc_info[2]
+            six.reraise(exc_info[1], None, exc_info[2])
         time.sleep(10)
 
         ssh_client.exec_command('ping -c 4 %s' % private_ip_in_vpc)
diff --git a/tox.ini b/tox.ini
index 05b611b..b9e9204 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,9 +26,11 @@ commands =
   rm -f .testrepository/times.dbm
 
 [testenv:pep8]
+basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:debug]
@@ -40,7 +42,7 @@ commands = oslo_debug_helper {posargs}
 show-source = True
 ignore = E122,E123,E125,E126,E127,E128
 builtins = _
-# H106: Don’t put vim configuration in source files
+# H106: Don't put vim configuration in source files
 # H203: Use assertIs(Not)None to check for None
 enable-extensions=H106,H203
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build