diff --git a/distil/api/web.py b/distil/api/web.py
index b23159c..42927b4 100644
--- a/distil/api/web.py
+++ b/distil/api/web.py
@@ -38,7 +38,7 @@ from keystonemiddleware import auth_token
 
 from .helpers import returns_json, json_must, validate_tenant_id, require_admin
 from .helpers import require_admin_or_owner
-from urlparse import urlparse
+from six.moves.urllib import parse as urlparse
 
 from oslo_log import log
 from oslo_config import cfg
diff --git a/distil/auth.py b/distil/auth.py
index b097391..17f6353 100644
--- a/distil/auth.py
+++ b/distil/auth.py
@@ -15,7 +15,7 @@
 import requests
 import json
 import urllib
-import config
+from distil import config
 
 # Provides authentication against Openstack
 from keystoneclient.v2_0 import client as KeystoneClient
diff --git a/distil/database.py b/distil/database.py
index d780aa5..42e3ba5 100644
--- a/distil/database.py
+++ b/distil/database.py
@@ -17,9 +17,9 @@ from .models import Resource, UsageEntry, Tenant, SalesOrder, _Last_Run
 from distil.constants import dawn_of_time
 from datetime import timedelta
 import json
-import config
+from distil import config
 import logging as log
-import helpers
+from distil import helpers
 
 
 class Database(object):
diff --git a/distil/erp/drivers/odoo.py b/distil/erp/drivers/odoo.py
index ec20a7a..437870f 100644
--- a/distil/erp/drivers/odoo.py
+++ b/distil/erp/drivers/odoo.py
@@ -433,8 +433,9 @@ class OdooDriver(driver.BaseDriver):
             price_spec = price_mapping[service_name]
 
             # Convert volume according to unit in price definition.
-            volume = general.convert_to(volume, unit, price_spec['unit'])
-            cost = (round(volume * Decimal(price_spec['rate']),
+            volume = float(general.convert_to(volume, unit,
+                                              price_spec['unit']))
+            cost = (round(volume * price_spec['rate'],
                           constants.PRICE_DIGITS)
                     if price_spec['rate'] else 0)
 
@@ -461,7 +462,8 @@ class OdooDriver(driver.BaseDriver):
                     }
                 )
 
-        result = {'total_cost': round(total_cost, constants.PRICE_DIGITS)}
+        result = {'total_cost': round(float(total_cost),
+                                      constants.PRICE_DIGITS)}
         if detailed:
             result.update({'details': cost_details})
 
diff --git a/distil/helpers.py b/distil/helpers.py
index c5c87ae..e1ed207 100644
--- a/distil/helpers.py
+++ b/distil/helpers.py
@@ -17,7 +17,7 @@ from cinderclient.v2 import client as cinderclient
 from glanceclient import client as glanceclient
 from keystoneclient.v2_0 import client as keystoneclient
 from decimal import Decimal
-import config
+from distil import config
 import math
 import logging as log
 
diff --git a/distil/interface.py b/distil/interface.py
index bf77230..16d1071 100644
--- a/distil/interface.py
+++ b/distil/interface.py
@@ -14,14 +14,14 @@
 
 import requests
 import json
-import auth
-from constants import date_format, other_date_format
-import config
+from distil import auth
+from distil import constants
+from distil import config
 from datetime import timedelta, datetime
 from contextlib import contextmanager
 import logging as log
 
-import urlparse
+from six.moves.urllib import parse as urlparse
 
 
 @contextmanager
@@ -85,12 +85,12 @@ def add_dates(start, end):
         {
             "field": "timestamp",
             "op": "ge",
-            "value": start.strftime(date_format)
+            "value": start.strftime(constants.date_format)
         },
         {
             "field": "timestamp",
             "op": "lt",
-            "value": end.strftime(date_format)
+            "value": end.strftime(constants.date_format)
         }
     ]
 
@@ -103,10 +103,10 @@ def sort_entries(data):
     for entry in data:
         try:
             entry['timestamp'] = datetime.strptime(
-                entry['timestamp'], date_format)
+                entry['timestamp'], constants.date_format)
         except ValueError:
             entry['timestamp'] = datetime.strptime(
-                entry['timestamp'], other_date_format)
+                entry['timestamp'], constants.other_date_format)
     return sorted(data, key=lambda x: x['timestamp'])
 
 
diff --git a/distil/service/api/v2/measurements.py b/distil/service/api/v2/measurements.py
index 61b373c..a578918 100644
--- a/distil/service/api/v2/measurements.py
+++ b/distil/service/api/v2/measurements.py
@@ -35,7 +35,7 @@ def _build_project_dict(project, usage):
 
     for entry in usage:
         service = {'name': entry.get('service'),
-                   'volume': entry.get('volume'),
+                   'volume': str(entry.get('volume')),
                    'unit': entry.get('unit')}
 
         resource = project_dict['resources'][entry.get('resource_id')]
diff --git a/distil/tests/unit/api/test_api.py b/distil/tests/unit/api/test_api.py
index f579718..b24fcdb 100644
--- a/distil/tests/unit/api/test_api.py
+++ b/distil/tests/unit/api/test_api.py
@@ -44,7 +44,7 @@ class TestAPI(base.APITest):
 
         self.assertEqual(
             {'versions': [{'id': 'v2', 'status': 'CURRENT'}]},
-            json.loads(ret.data)
+            json.loads(ret.get_data(as_text=True))
         )
 
     @mock.patch('distil.erp.drivers.odoo.OdooDriver.get_products')
@@ -55,7 +55,7 @@ class TestAPI(base.APITest):
 
         ret = self.client.get('/v2/products')
 
-        self.assertEqual({'products': []}, json.loads(ret.data))
+        self.assertEqual({'products': []}, json.loads(ret.get_data(as_text=True)))
 
     @mock.patch('distil.erp.drivers.odoo.OdooDriver.get_products')
     @mock.patch('odoorpc.ODOO')
@@ -72,7 +72,7 @@ class TestAPI(base.APITest):
         ret = self.client.get('/v2/products?regions=nz_1,nz_2')
 
         mock_odoo_get_products.assert_called_once_with(['nz_1', 'nz_2'])
-        self.assertEqual({'products': []}, json.loads(ret.data))
+        self.assertEqual({'products': []}, json.loads(ret.get_data(as_text=True)))
 
     @mock.patch('distil.common.openstack.get_regions')
     def test_products_get_with_invalid_regions(self, mock_regions):
@@ -138,7 +138,7 @@ class TestAPI(base.APITest):
                     }
                 }
             },
-            json.loads(ret.data)
+            json.loads(ret.get_data(as_text=True))
         )
 
     @mock.patch('distil.erp.drivers.odoo.OdooDriver.get_invoices')
@@ -177,7 +177,7 @@ class TestAPI(base.APITest):
                 'project_id': default_project,
                 'invoices': {}
             },
-            json.loads(ret.data)
+            json.loads(ret.get_data(as_text=True))
         )
 
     def test_get_other_project_invoice_not_admin(self):
@@ -196,7 +196,7 @@ class TestAPI(base.APITest):
         self._setup_policy({"rating:invoices:get": "rule:admin_or_owner"})
         ret = self.client.get(url, headers={'X-Tenant-Id': default_project})
 
-        self.assertEqual(403, json.loads(ret.data).get('error_code'))
+        self.assertEqual(403, json.loads(ret.get_data(as_text=True)).get('error_code'))
 
     @mock.patch('distil.erp.drivers.odoo.OdooDriver.get_quotations')
     @mock.patch('odoorpc.ODOO')
@@ -205,7 +205,7 @@ class TestAPI(base.APITest):
 
         default_project = 'tenant_1'
         res_id = 'instance_1'
-        today = date.today()
+        today = datetime.utcnow()
         datetime_today = datetime(today.year, today.month, today.day)
 
         db_api.project_add(
@@ -241,7 +241,7 @@ class TestAPI(base.APITest):
                 'end': str(datetime_today),
                 'project_name': 'default_project',
                 'project_id': default_project,
-                'quotations': {str(today): {}}
+                'quotations': {today.strftime("%Y-%m-%d"): {}}
             },
-            json.loads(ret.data)
+            json.loads(ret.get_data(as_text=True))
         )
diff --git a/distil/tests/unit/common/test_cache.py b/distil/tests/unit/common/test_cache.py
index 9ee0b0d..3a2be3e 100644
--- a/distil/tests/unit/common/test_cache.py
+++ b/distil/tests/unit/common/test_cache.py
@@ -47,5 +47,5 @@ class TestCache(base.DistilTestCase):
                 return "evening, Tom"
 
         name = 'Tom'
-        for x in xrange(0, 2):
+        for x in range(0, 2):
             self.assertEqual(test(name), 'hello, Tom')
diff --git a/distil/tests/unit/erp/drivers/test_odoo.py b/distil/tests/unit/erp/drivers/test_odoo.py
index 535b4a4..66aed13 100644
--- a/distil/tests/unit/erp/drivers/test_odoo.py
+++ b/distil/tests/unit/erp/drivers/test_odoo.py
@@ -15,7 +15,7 @@
 
 from collections import namedtuple
 from datetime import datetime
-
+from decimal import Decimal
 import mock
 
 from distil.erp.drivers import odoo
@@ -338,7 +338,7 @@ class TestOdooDriver(base.DistilTestCase):
             detailed=True
         )
 
-        self.assertEqual(
+        self.assertDictEqual(
             {
                 'total_cost': 0.03,
                 'details': {
diff --git a/distil/tests/unit/service/api/v2/test_measurements.py b/distil/tests/unit/service/api/v2/test_measurements.py
index 0cab70c..9ee56de 100644
--- a/distil/tests/unit/service/api/v2/test_measurements.py
+++ b/distil/tests/unit/service/api/v2/test_measurements.py
@@ -76,13 +76,13 @@ class MeasurementsTest(base.DistilWithDbTestCase):
                     '111': {
                         'name': 'resource1',
                         'services': [
-                            {'name': 'srv1', 'volume': 10, 'unit': 'byte'}
+                            {'name': 'srv1', 'volume': '10', 'unit': 'byte'}
                         ]
                     },
                     '222': {
                         'name': 'resource2',
                         'services': [
-                            {'name': 'srv2', 'volume': 20, 'unit': 'byte'}
+                            {'name': 'srv2', 'volume': '20', 'unit': 'byte'}
                         ]
                     }
                 }
diff --git a/distil/transformer/arithmetic.py b/distil/transformer/arithmetic.py
index 169e590..f9167eb 100644
--- a/distil/transformer/arithmetic.py
+++ b/distil/transformer/arithmetic.py
@@ -30,7 +30,8 @@ class MaxTransformer(BaseTransformer):
     """
 
     def _transform_usage(self, meter_name, raw_data, start_at, end_at):
-        max_vol = max([v["volume"] for v in raw_data]) if len(raw_data) else 0
+        max_vol = max([(v["volume"] if v["volume"] else 0)
+                       for v in raw_data]) if len(raw_data) else 0
         max_vol = max_vol if max_vol else 0
 
         hours = (end_at - start_at).total_seconds() / 3600.0
@@ -49,7 +50,8 @@ class StorageMaxTransformer(BaseTransformer):
         if not data:
             return None
 
-        max_vol = max([v["volume"] for v in data]) or 0
+        max_vol = max([(v["volume"] if v["volume"] else 0)
+                       for v in data]) or 0
 
         if "volume_type" in data[-1]['metadata']:
             vtype = data[-1]['metadata']['volume_type']
diff --git a/distil/transformers.py b/distil/transformers.py
index 0c3ece2..158d6c9 100644
--- a/distil/transformers.py
+++ b/distil/transformers.py
@@ -12,9 +12,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import constants
-import helpers
-import config
+from distil import constants
+from distil import helpers
+from distil import config
 import logging as log
 from distil.constants import iso_time, iso_date
 
@@ -217,7 +217,8 @@ class GaugeMax(Transformer):
     """
 
     def _transform_usage(self, name, data, start, end):
-        max_vol = max([v["counter_volume"] for v in data]) if len(data) else 0
+        max_vol = max([(v["counter_volume"] if v["counter_volume"] else 0)
+                       for v in data]) if len(data) else 0
         if max_vol is None:
             max_vol = 0
             log.warning("None max_vol value for %s in window: %s - %s " %
@@ -239,7 +240,8 @@ class StorageMax(Transformer):
         if not data:
             return None
 
-        max_vol = max([v["counter_volume"] for v in data])
+        max_vol = max([(v["counter_volume"] if v["counter_volume"] else 0)
+                       for v in data])
 
         if max_vol is None:
             max_vol = 0
diff --git a/tox.ini b/tox.ini
index 28df0d5..1fa04a8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py34,py27,pep8
+envlist = py35,py27,pep8
 minversion = 1.6
 skipsdist = True
 
@@ -20,10 +20,6 @@ whitelist_externals =
     rm
     find
 
-[testenv:py33]
-deps = -r{toxinidir}/requirements-py3.txt
-       -r{toxinidir}/test-requirements-py3.txt
-
 [testenv:cover]
 commands = python setup.py testr --coverage --testr-args='{posargs}'