diff --git a/examples/example.py b/examples/example.py
index cd09eb3..719eb17 100644
--- a/examples/example.py
+++ b/examples/example.py
@@ -6,6 +6,7 @@
 
 if __name__ == '__main__' and __package__ is None:
     from os import sys, path
+
     sys.path.append(path.dirname(path.dirname(path.abspath(__file__))))
     from smtpapi import SMTPAPIHeader
 
@@ -21,7 +22,7 @@
 
 # [Unique Arguments](http://sendgrid.com/docs/API_Reference/SMTP_API/unique_arguments.html)
 # header.add_unique_arg('key', 'value')
-header.set_unique_args({'key':'value'})
+header.set_unique_args({'key': 'value'})
 
 # [Categories](http://sendgrid.com/docs/API_Reference/SMTP_API/categories.html)
 # header.add_category('category')
@@ -43,6 +44,6 @@
 # [Scheduling Parameters](https://sendgrid.com/docs/API_Reference/SMTP_API/scheduling_parameters.html)
 # header.add_send_each_at(unix_timestamp) #  must be a unix timestamp
 # header.set_send_each_at([]) #  must be a unix timestamp
-header.set_send_at(int(time.time())) #  must be a unix timestamp
+header.set_send_at(int(time.time()))  # must be a unix timestamp
 
 print(header.json_string())
diff --git a/smtpapi/__init__.py b/smtpapi/__init__.py
index 5781d87..13306e6 100644
--- a/smtpapi/__init__.py
+++ b/smtpapi/__init__.py
@@ -2,11 +2,11 @@
 import json
 import os
 
-
 dir_path = os.path.dirname(os.path.realpath(__file__))
 if os.path.isfile(os.path.join(dir_path, 'VERSION.txt')):
     __version__ = open(os.path.join(dir_path, 'VERSION.txt')).read().strip()
 
+
 class _CustomJSONEncoder(json.JSONEncoder):
 
     def default(self, o):
@@ -15,6 +15,7 @@ def default(self, o):
         # Provide a fallback to the default encoder if we haven't implemented special support for the object's class
         return super(_CustomJSONEncoder, self).default(o)
 
+
 class SMTPAPIHeader(object):
 
     def __init__(self):
@@ -67,14 +68,14 @@ def set_sections(self, value):
 
     def add_send_each_at(self, time):
         if 'send_each_at' not in self.data:
-          self.data['send_each_at'] = []
+            self.data['send_each_at'] = []
         self.data['send_each_at'].append(time)
 
     def set_send_each_at(self, time):
-      self.data['send_each_at'] = time
+        self.data['send_each_at'] = time
 
     def set_send_at(self, time):
-      self.data['send_at'] = time
+        self.data['send_at'] = time
 
     def add_filter(self, app, setting, val):
         if 'filters' not in self.data:
diff --git a/test/__init__.py b/test/__init__.py
index 83b29d8..3e700d8 100644
--- a/test/__init__.py
+++ b/test/__init__.py
@@ -87,6 +87,7 @@ def test_license_year(self):
                     break
         self.assertEqual('Copyright (c) 2013-%s SendGrid, Inc.' % datetime.datetime.now().year, copyright_line)
 
+
 class TestRepository(unittest.TestCase):
 
     def setUp(self):
@@ -122,5 +123,6 @@ def test_repository_files_exists(self):
             else:
                 self.assertTrue(os.path.exists(file_path), msg=self.file_not_found_message.format(file_path))
 
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/test/test_lisence.py b/test/test_lisence.py
index d47c309..b3a7645 100644
--- a/test/test_lisence.py
+++ b/test/test_lisence.py
@@ -1,6 +1,7 @@
 import sendgrid
 from sendgrid.helpers.mail import *
 from sendgrid.version import __version__
+
 try:
     import unittest2 as unittest
 except ImportError:
@@ -13,6 +14,7 @@
 
 host = "http://localhost:4010"
 
+
 def test_license_year(self):
     LICENSE_FILE = 'license.txt'
     with open(LICENSE_FILE, 'r') as f:
diff --git a/test/test_project.py b/test/test_project.py
index daf7d85..41e440a 100644
--- a/test/test_project.py
+++ b/test/test_project.py
@@ -5,6 +5,7 @@
 except ImportError:
     import unittest
 
+
 class ProjectTests(unittest.TestCase):
 
     # ./Docker or docker/Docker
@@ -71,5 +72,6 @@ def test_usage(self):
     def test_use_cases(self):
         self.assertEqual(True, os.path.isfile('./VERSION.txt'))
 
+
 if __name__ == '__main__':
     unittest.main()