diff --git a/examples/helpers/stats/stats_example.py b/examples/helpers/stats/stats_example.py
index d48664c3f..f3196881a 100644
--- a/examples/helpers/stats/stats_example.py
+++ b/examples/helpers/stats/stats_example.py
@@ -45,6 +45,7 @@ def build_subuser_stats():
     # subuser_stats.add_subuser(Subuser("bar"))
     return subuser_stats.get()
 
+
 def build_subuser_stats_sums():
     subuser_stats = SubuserStats()
     subuser_stats.start_date = '2017-10-15'
@@ -92,6 +93,7 @@ def get_subuser_stats_sums():
     print(response.headers)
     pprint_json(response.body)
 
+
 get_global_stats()
 get_category_stats()
 get_category_stats_sums()
diff --git a/register.py b/register.py
index 0a7ffe8d8..00ddca15c 100644
--- a/register.py
+++ b/register.py
@@ -17,4 +17,4 @@
               '''
 final_text = readme_rst.replace(replace, replacement)
 with open('./README.txt', 'w', encoding='utf-8') as f:
-  f.write(final_text)
+    f.write(final_text)
diff --git a/sendgrid/helpers/inbound/config.py b/sendgrid/helpers/inbound/config.py
index d0c6517bc..32bec0793 100644
--- a/sendgrid/helpers/inbound/config.py
+++ b/sendgrid/helpers/inbound/config.py
@@ -15,7 +15,7 @@ def __init__(self, **opts):
         self.path = opts.get(
             'path', os.path.abspath(os.path.dirname(__file__))
         )
-        with open(self.path + '/config.yml') as stream:
+        with open('{0}/config.yml'.format(self.path)) as stream:
             config = yaml.load(stream)
             self._debug_mode = config['debug_mode']
             self._endpoint = config['endpoint']
@@ -28,8 +28,9 @@ def init_environment():
         """Allow variables assigned in .env available using
            os.environ.get('VAR_NAME')"""
         base_path = os.path.abspath(os.path.dirname(__file__))
-        if os.path.exists(base_path + '/.env'):
-            with open(base_path + '/.env') as f:
+        env_path = '{0}/.env'.format(base_path)
+        if os.path.exists(env_path):
+            with open(env_path) as f:
                 lines = f.readlines()
                 for line in lines:
                     var = line.strip().split('=')
diff --git a/sendgrid/helpers/inbound/send.py b/sendgrid/helpers/inbound/send.py
index 6de575aab..e3526eb7c 100644
--- a/sendgrid/helpers/inbound/send.py
+++ b/sendgrid/helpers/inbound/send.py
@@ -37,6 +37,7 @@ def url(self):
         """URL to send to."""
         return self._url
 
+
 def main():
     config = Config()
     parser = argparse.ArgumentParser(description='Test data and optional host.')
@@ -54,5 +55,6 @@ def main():
     print(response.headers)
     print(response.body)
 
+
 if __name__ == '__main__':
-    main()
\ No newline at end of file
+    main()
diff --git a/sendgrid/helpers/mail/content.py b/sendgrid/helpers/mail/content.py
index cff8ac498..da4ed8027 100644
--- a/sendgrid/helpers/mail/content.py
+++ b/sendgrid/helpers/mail/content.py
@@ -1,5 +1,6 @@
 from .validators import ValidateAPIKey
 
+
 class Content(object):
     """Content to be included in your email.
 
diff --git a/sendgrid/helpers/mail/exceptions.py b/sendgrid/helpers/mail/exceptions.py
index ab4dd9c0c..5279c365a 100644
--- a/sendgrid/helpers/mail/exceptions.py
+++ b/sendgrid/helpers/mail/exceptions.py
@@ -2,6 +2,7 @@
 # Various types of extensible SendGrid related exceptions
 ################################################################
 
+
 class SendGridException(Exception):
     """Wrapper/default SendGrid-related exception"""
     pass
@@ -19,4 +20,3 @@ def __init__(self,
                  message="SendGrid API Key detected"):
         self.expression = expression
         self.message = message
-
diff --git a/sendgrid/helpers/mail/validators.py b/sendgrid/helpers/mail/validators.py
index b4a69f697..96e81795e 100644
--- a/sendgrid/helpers/mail/validators.py
+++ b/sendgrid/helpers/mail/validators.py
@@ -3,6 +3,7 @@
 # Various types of Validators
 ################################################################
 
+
 class ValidateAPIKey(object):
     """Validates content to ensure SendGrid API key is not present"""
 
@@ -27,7 +28,6 @@ def __init__(self, regex_strings=None, use_default=True):
             default_regex_string = 'SG\.[0-9a-zA-Z]+\.[0-9a-zA-Z]+'
             self.regexes.add(re.compile(default_regex_string))
 
-
     def validate_message_dict(self, request_body):
         """With the JSON dict that will be sent to SendGrid's API, 
             check the content for SendGrid API keys - throw exception if found
@@ -54,7 +54,6 @@ def validate_message_dict(self, request_body):
                         message_text = content.get("value", "")
                         self.validate_message_text(message_text)
 
-                        
     def validate_message_text(self, message_string):
         """With a message string, check to see if it contains a SendGrid API Key
             If a key is found, throw an exception
@@ -68,4 +67,3 @@ def validate_message_text(self, message_string):
             for regex in self.regexes:
                 if regex.match(message_string) is not None:
                     raise APIKeyIncludedException()
-
diff --git a/setup.py b/setup.py
index 014691b61..11aa3a07e 100644
--- a/setup.py
+++ b/setup.py
@@ -20,6 +20,7 @@ def getRequires():
         deps.append('unittest2py3k')
     return deps
 
+
 setup(
     name='sendgrid',
     version=str(__version__),
diff --git a/test/test_app.py b/test/test_app.py
index 1a8e4a698..13b0a9522 100644
--- a/test/test_app.py
+++ b/test/test_app.py
@@ -23,4 +23,4 @@ def test_up_and_running(self):
     def test_used_port_true(self):
         if self.config.debug_mode:
             port = int(os.environ.get("PORT", self.config.port))
-            self.assertEqual(port, self.config.port)
\ No newline at end of file
+            self.assertEqual(port, self.config.port)
diff --git a/test/test_config.py b/test/test_config.py
index 301bacc92..d20af40e2 100644
--- a/test/test_config.py
+++ b/test/test_config.py
@@ -43,7 +43,7 @@ def test_initialization(self):
 
     def test_init_environment(self):
         config_file = sendgrid.helpers.inbound.config.__file__
-        env_file_path = os.path.abspath(os.path.dirname(config_file)) + '/.env'
+        env_file_path = '{0}/.env'.format(os.path.abspath(os.path.dirname(config_file)))
         with open(env_file_path, 'w') as f:
             f.write('RANDOM_VARIABLE=RANDOM_VALUE')
         Config()
diff --git a/test/test_mail.py b/test/test_mail.py
index 08d0feb8e..ffe5586b4 100644
--- a/test/test_mail.py
+++ b/test/test_mail.py
@@ -52,7 +52,7 @@ def test_sendgridAPIKey(self):
         personalization.add_to(Email("test@example.com"))
         mail.add_personalization(personalization)
 
-        #Try to include SendGrid API key
+        # Try to include SendGrid API key
         try:
             mail.add_content(Content("text/plain", "some SG.2123b1B.1212lBaC here"))
             mail.add_content(
@@ -72,11 +72,11 @@ def test_sendgridAPIKey(self):
                 '"subject": "Hello World from the SendGrid Python Library"}'
             )
 
-        #Exception should be thrown
+        # Exception should be thrown
         except Exception as e:
             pass
 
-        #Exception not thrown
+        # Exception not thrown
         else:
             self.fail("Should have failed as SendGrid API key included")
 
diff --git a/test/test_project.py b/test/test_project.py
index 4fbc8147c..5e269ae43 100644
--- a/test/test_project.py
+++ b/test/test_project.py
@@ -5,6 +5,7 @@
 except ImportError:
     import unittest
 
+
 class ProjectTests(unittest.TestCase):
 
     # ./docker
@@ -71,5 +72,6 @@ def test_usage(self):
     def test_use_cases(self):
         self.assertTrue(os.path.isfile('./use_cases/README.md'))
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/test/test_send.py b/test/test_send.py
index 16d496b85..7079c8b0e 100644
--- a/test/test_send.py
+++ b/test/test_send.py
@@ -30,13 +30,18 @@ def test_send(self):
         x = send.Send(fake_url)
         x.test_payload(fake_url)
 
-        send.Client.assert_called_once_with(host=fake_url, request_headers={'User-Agent': 'SendGrid-Test',
-                                                                            'Content-Type': 'multipart/form-data; boundary=xYzZY'})
+        send.Client.assert_called_once_with(host=fake_url, request_headers={
+            'User-Agent': 'SendGrid-Test',
+            'Content-Type': 'multipart/form-data; boundary=xYzZY'
+        })
 
     def test_main_call(self):
         fake_url = 'https://fake_url'
 
-        with mock.patch('argparse.ArgumentParser.parse_args', return_value=argparse.Namespace(host=fake_url, data='test_file.txt')):
+        with mock.patch('argparse.ArgumentParser.parse_args', return_value=argparse.Namespace(
+                host=fake_url, data='test_file.txt')):
             send.main()
-            send.Client.assert_called_once_with(host=fake_url, request_headers={'User-Agent': 'SendGrid-Test',
-                                                                                'Content-Type': 'multipart/form-data; boundary=xYzZY'})
+            send.Client.assert_called_once_with(host=fake_url, request_headers={
+                'User-Agent': 'SendGrid-Test',
+                'Content-Type': 'multipart/form-data; boundary=xYzZY'
+            })
diff --git a/test/test_sendgrid.py b/test/test_sendgrid.py
index c545cbb2d..37fe9f9f8 100644
--- a/test/test_sendgrid.py
+++ b/test/test_sendgrid.py
@@ -1,6 +1,7 @@
 import sendgrid
 from sendgrid.helpers.mail import *
 from sendgrid.version import __version__
+
 try:
     import unittest2 as unittest
 except ImportError:
@@ -25,7 +26,7 @@ def setUpClass(cls):
         cls.sg = sendgrid.SendGridAPIClient(host=host)
         cls.devnull = open(os.devnull, 'w')
         prism_cmd = None
-        
+
         # try:
         #     # check for prism in the PATH
         #     if subprocess.call('prism version'.split(), stdout=cls.devnull) == 0:
@@ -134,7 +135,7 @@ def test_reset_request_headers(self):
         self.assertNotIn('blah', self.sg.client.request_headers)
         self.assertNotIn('blah2x', self.sg.client.request_headers)
 
-        for k,v in self.sg._default_headers.items():
+        for k, v in self.sg._default_headers.items():
             self.assertEqual(v, self.sg.client.request_headers[k])
 
     def test_hello_world(self):
@@ -144,8 +145,11 @@ def test_hello_world(self):
         content = Content(
             "text/plain", "and easy to do anywhere, even with Python")
         mail = Mail(from_email, subject, to_email, content)
-        self.assertTrue(mail.get() == {'content': [{'type': 'text/plain', 'value': 'and easy to do anywhere, even with Python'}], 'personalizations': [
-                        {'to': [{'email': 'test@example.com'}]}], 'from': {'email': 'test@example.com'}, 'subject': 'Sending with SendGrid is Fun'})
+        self.assertTrue(
+            mail.get() == {'content': [{'type': 'text/plain', 'value': 'and easy to do anywhere, even with Python'}],
+                           'personalizations': [
+                               {'to': [{'email': 'test@example.com'}]}], 'from': {'email': 'test@example.com'},
+                           'subject': 'Sending with SendGrid is Fun'})
 
     def test_access_settings_activity_get(self):
         params = {'limit': 1}
diff --git a/test/test_unassigned.py b/test/test_unassigned.py
index d13451277..6054447d8 100644
--- a/test/test_unassigned.py
+++ b/test/test_unassigned.py
@@ -55,6 +55,7 @@
       } ]
       '''
 
+
 def get_all_ip():
     ret_val = json.loads(ret_json)
     return ret_val
@@ -67,7 +68,6 @@ def make_data():
     return data
 
 
-
 def test_unassigned_ip_json():
 
     data =  make_data()
@@ -79,6 +79,7 @@ def test_unassigned_ip_json():
     for item in calculated:
         assert item["ip"] in data
 
+
 def test_unassigned_ip_obj():
 
     data =  make_data()
@@ -89,6 +90,7 @@ def test_unassigned_ip_obj():
     for item in calculated:
         assert item["ip"] in data
 
+
 def test_unassigned_baddata():
     as_json = False
     calculated = unassigned(dict(), as_json=as_json)