diff --git a/blinkpy/helpers/constants.py b/blinkpy/helpers/constants.py
index 2a2d608..418a134 100644
--- a/blinkpy/helpers/constants.py
+++ b/blinkpy/helpers/constants.py
@@ -1,7 +1,5 @@
-'''
-constants.py
-Generates constants for use in blinkpy
-'''
+"""Generates constants for use in blinkpy."""
+
 import os
 
 MAJOR_VERSION = 0
diff --git a/blinkpy/helpers/errors.py b/blinkpy/helpers/errors.py
index 725c683..a3b89b3 100644
--- a/blinkpy/helpers/errors.py
+++ b/blinkpy/helpers/errors.py
@@ -1,6 +1,13 @@
+"""Module to define error types."""
+
 USERNAME = (0, "Username must be a string")
 PASSWORD = (1, "Password must be a string")
-AUTHENTICATE = (2, "Cannot authenticate since either password or username has not been set")
-AUTH_TOKEN = (3, "Authentication header incorrect.  Are you sure you logged in and received your token?")
+AUTHENTICATE = (
+    2,
+    "Cannot authenticate since either password or username has not been set"
+)
+AUTH_TOKEN = (
+    3,
+    "Authentication header incorrect.  Are you sure you received your token?"
+)
 REQUEST = (4, "Cannot perform request (get/post type incorrect)")
-             
\ No newline at end of file
diff --git a/requirements_test.txt b/requirements_test.txt
index 06fff4d..f0e1caf 100644
--- a/requirements_test.txt
+++ b/requirements_test.txt
@@ -1,6 +1,6 @@
 flake8==3.3
 flake8-docstrings==1.1.0
-pylint==1.7.2
+pylint==1.8.1
 pydocstyle==2.0.0
 pytest>=2.9.2
 pytest-cov>=2.3.1
diff --git a/tests/test_blink_system.py b/tests/test_blink_system.py
index e4242e3..abd873e 100644
--- a/tests/test_blink_system.py
+++ b/tests/test_blink_system.py
@@ -9,8 +9,8 @@ any communication related errors at startup.
 import unittest
 from unittest import mock
 from blinkpy import blinkpy as blinkpy
-import tests.mock_responses as mresp
 import blinkpy.helpers.constants as const
+import tests.mock_responses as mresp
 
 USERNAME = 'foobar'
 PASSWORD = 'deadbeef'
diff --git a/tox.ini b/tox.ini
index 032b19d..849b66c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,9 +20,9 @@ deps =
 basepython = python3
 ignore_errors = True
 commands = 
-    pylint --rcfile={toxinidir}/pylintrc blinkpy.py tests
-    flake8 blinkpy.py tests
-    pydocstyle blinkpy.py tests
+    pylint --rcfile={toxinidir}/pylintrc blinkpy tests
+    flake8 blinkpy tests
+    pydocstyle blinkpy tests
     rst-lint README.rst
     rst-lint CHANGES.rst
 
@@ -38,4 +38,4 @@ commands =
     /bin/rm -rf build dist
     python setup.py bdist_wheel
     /bin/sh -c "pip install --upgrade dist/*.whl"
-    py.test tests
\ No newline at end of file
+    py.test tests