diff --git a/mwparserfromhell/nodes/argument.py b/mwparserfromhell/nodes/argument.py
index 06facb4..d7db92a 100644
--- a/mwparserfromhell/nodes/argument.py
+++ b/mwparserfromhell/nodes/argument.py
@@ -30,6 +30,7 @@ __all__ = ["Argument"]
 
 class Argument(Node):
     """Represents a template argument substitution, like ``{{{foo}}}``."""
+
     def __init__(self, name, default=None):
         super(Argument, self).__init__()
         self._name = name
diff --git a/mwparserfromhell/nodes/comment.py b/mwparserfromhell/nodes/comment.py
index b34c29e..e96ce38 100644
--- a/mwparserfromhell/nodes/comment.py
+++ b/mwparserfromhell/nodes/comment.py
@@ -29,6 +29,7 @@ __all__ = ["Comment"]
 
 class Comment(Node):
     """Represents a hidden HTML comment, like ``<!-- foobar -->``."""
+
     def __init__(self, contents):
         super(Comment, self).__init__()
         self._contents = contents
diff --git a/mwparserfromhell/nodes/text.py b/mwparserfromhell/nodes/text.py
index 60ba847..6fda3da 100644
--- a/mwparserfromhell/nodes/text.py
+++ b/mwparserfromhell/nodes/text.py
@@ -29,6 +29,7 @@ __all__ = ["Text"]
 
 class Text(Node):
     """Represents ordinary, unformatted text with no special properties."""
+
     def __init__(self, value):
         super(Text, self).__init__()
         self._value = value
diff --git a/mwparserfromhell/nodes/wikilink.py b/mwparserfromhell/nodes/wikilink.py
index f880016..6fea468 100644
--- a/mwparserfromhell/nodes/wikilink.py
+++ b/mwparserfromhell/nodes/wikilink.py
@@ -30,6 +30,7 @@ __all__ = ["Wikilink"]
 
 class Wikilink(Node):
     """Represents an internal wikilink, like ``[[Foo|Bar]]``."""
+
     def __init__(self, title, text=None):
         super(Wikilink, self).__init__()
         self._title = title
diff --git a/mwparserfromhell/string_mixin.py b/mwparserfromhell/string_mixin.py
index efd28d8..eee58b9 100644
--- a/mwparserfromhell/string_mixin.py
+++ b/mwparserfromhell/string_mixin.py
@@ -50,6 +50,7 @@ class StringMixIn(object):
     :py:meth:`__unicode__` instead of the immutable ``self`` like the regular
     ``str`` type.
     """
+
     if py3k:
         def __str__(self):
             return self.__unicode__()
diff --git a/tests/_test_tokenizer.py b/tests/_test_tokenizer.py
index 4d12dc9..379b4fa 100644
--- a/tests/_test_tokenizer.py
+++ b/tests/_test_tokenizer.py
@@ -38,6 +38,7 @@ class TokenizerTestCase(object):
     TestCTokenizer. Tests are loaded dynamically from files in the 'tokenizer'
     directory.
     """
+
     @classmethod
     def _build_test_method(cls, funcname, data):
         """Create and return a method to be treated as a test case method.
diff --git a/tests/test_ctokenizer.py b/tests/test_ctokenizer.py
index 07b5290..4dbeceb 100644
--- a/tests/test_ctokenizer.py
+++ b/tests/test_ctokenizer.py
@@ -27,6 +27,7 @@ from _test_tokenizer import TokenizerTestCase
 
 class TestCTokenizer(TokenizerTestCase, unittest.TestCase):
     """Test cases for the C tokenizer."""
+
     @classmethod
     def setUpClass(cls):
         from mwparserfromhell.parser._tokenizer import CTokenizer
diff --git a/tests/test_docs.py b/tests/test_docs.py
index 8673cb9..075b0a7 100644
--- a/tests/test_docs.py
+++ b/tests/test_docs.py
@@ -30,6 +30,7 @@ from mwparserfromhell.compat import py3k, str, StringIO
 
 class TestDocs(unittest.TestCase):
     """Integration test cases for mwparserfromhell's documentation."""
+
     def assertPrint(self, input, output):
         """Assertion check that *input*, when printed, produces *output*."""
         buff = StringIO()
diff --git a/tests/test_pytokenizer.py b/tests/test_pytokenizer.py
index a2f2482..73e6fe7 100644
--- a/tests/test_pytokenizer.py
+++ b/tests/test_pytokenizer.py
@@ -27,6 +27,7 @@ from _test_tokenizer import TokenizerTestCase
 
 class TestPyTokenizer(TokenizerTestCase, unittest.TestCase):
     """Test cases for the Python tokenizer."""
+
     @classmethod
     def setUpClass(cls):
         from mwparserfromhell.parser.tokenizer import Tokenizer
diff --git a/tests/test_smart_list.py b/tests/test_smart_list.py
index b0a10cb..f6d22ae 100644
--- a/tests/test_smart_list.py
+++ b/tests/test_smart_list.py
@@ -384,7 +384,5 @@ class TestSmartList(unittest.TestCase):
         self.assertEquals([4, 3, 2, 1.9, 1.8, 5, 6, 7, 8, 8.1, 8.2], child1)
         self.assertEquals([4, 3, 2, 1.9, 1.8], child2)
 
-        # also test whether children that exit scope are removed from parent's map
-
 if __name__ == "__main__":
     unittest.main(verbosity=2)
diff --git a/tests/test_string_mixin.py b/tests/test_string_mixin.py
index 8d86c8e..7b99995 100644
--- a/tests/test_string_mixin.py
+++ b/tests/test_string_mixin.py
@@ -37,6 +37,7 @@ class _FakeString(StringMixIn):
 
 class TestStringMixIn(unittest.TestCase):
     """Test cases for the StringMixIn class."""
+
     def test_docs(self):
         """make sure the various methods of StringMixIn have docstrings"""
         methods = [