diff --git a/datapoint/__init__.py b/datapoint/__init__.py
index cf80bf7..a65394b 100644
--- a/datapoint/__init__.py
+++ b/datapoint/__init__.py
@@ -1,6 +1,6 @@
 """Datapoint API to retrieve Met Office data"""
 
-__version__ = "0.4.0"
+__version__ = "0.4.1"
 __author__ = "Jacob Tomlinson"
 __author_email__ = "jacob.tomlinson@metoffice.gov.uk"
 
diff --git a/datapoint/regions/RegionManager.py b/datapoint/regions/RegionManager.py
index 446fff8..e917056 100644
--- a/datapoint/regions/RegionManager.py
+++ b/datapoint/regions/RegionManager.py
@@ -5,12 +5,12 @@
 
 from datapoint.Site import Site
 from datapoint.regions.region_names import REGION_NAMES
-
 REGIONS_BASE_URL = 'http://datapoint.metoffice.gov.uk/public/data/txt/wxfcs/regionalforecast/json'
 
+
 class RegionManager(object):
     '''
-    Datapoint Manager for national and regional text forecasts 
+    Datapoint Manager for national and regional text forecasts
     '''
     def __init__(self, api_key, base_url=None):
         self.api_key = api_key
@@ -30,8 +30,8 @@ def call_api(self, path, **kwargs):
         '''
         if 'key' not in kwargs:
             kwargs['key'] = self.api_key
-        req = requests.get('{}{}'.format(self.base_url, path), params=kwargs)
-        
+        req = requests.get('{0}{1}'.format(self.base_url, path), params=kwargs)
+
         if req.status_code != requests.codes.ok:
             req.raise_for_status()
 
@@ -39,9 +39,9 @@ def call_api(self, path, **kwargs):
 
     def get_all_regions(self):
         '''
-        Request a list of regions from Datapoint. Returns each Region 
-        as a Site object. Regions rarely change, so we cache the response 
-        for one hour to minimise requests to API. 
+        Request a list of regions from Datapoint. Returns each Region
+        as a Site object. Regions rarely change, so we cache the response
+        for one hour to minimise requests to API.
         '''
         if (time() - self.regions_last_update) < self.regions_update_time:
             return self.regions_last_request
@@ -63,4 +63,4 @@ def get_raw_forecast(self, region_id):
         '''
         Request unformatted forecast for a specific region_id.
         '''
-        return self.call_api('/{}'.format(region_id)) 
+        return self.call_api('/{0}'.format(region_id))
diff --git a/setup.py b/setup.py
index 81c8dbf..ee9c435 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@
 from distutils.core import setup
 
 setup(name='datapoint',
-      version='0.4.0',
+      version='0.4.1',
       install_requires=[
           "requests >= 2.3.0",
           "appdirs",
diff --git a/tests/integration/regions_test.py b/tests/integration/regions_test.py
index 246c15a..58739b4 100644
--- a/tests/integration/regions_test.py
+++ b/tests/integration/regions_test.py
@@ -24,10 +24,12 @@ def test_call_api(self):
 
     def test_get_all_regions(self):
         all_regions = self.regions.get_all_regions()
-        sample_region = filter(lambda x: x.id == '515', all_regions)[0]
+        sample_region = next(
+            region for region in all_regions
+            if region.id == '515')
         assert (sample_region.name == 'UK')
         assert (sample_region.region == 'uk')
-    
+
     def test_get_raw_forecast(self):
         sample_region = self.regions.get_all_regions()[0]
         response = self.regions.get_raw_forecast(
@@ -38,4 +40,4 @@ def test_get_raw_forecast(self):
         forecast_periods = response['FcstPeriods']['Period']
         forecast_ids = [period['id'] for period in forecast_periods]
         expected_ids = ['day1to2', 'day3to5', 'day6to15', 'day16to30']
-        assert (forecast_ids == expected_ids)
\ No newline at end of file
+        assert (forecast_ids == expected_ids)