Fix some linter errors.

Author: braxtonmckee

tox.ini

@@ -71,6 +71,14 @@ ignore =
     W503,
     # line break after binary operator
     W504,
+    # do not compare types, use isinstance()
+    E721,
+    # missing whitespace after ','
+    E231,
+    # line too long
+    E501,
+    # redefinition of unused name
+    F811,
 
 per-file-ignores=
     __init__.py: F401,