Fixed pylint & flake8 warnings and errors.

tox.ini

@@ -91,14 +91,12 @@ reports = no
 #output-format = colorized
 indent-string = "    "
 disable =
-        bad-continuation,
         broad-except,
         duplicate-code,
         fixme,
         invalid-name,
         line-too-long,
         missing-docstring,
-        mixed-indentation,
         no-else-raise,
         no-else-return,
         super-with-arguments,   # Can be re-factored, at some point.