Sorry, but I don't want my Travis build failing because of stylistic errors. Additionally, I'm not a huge fan of all of the pep8/pyflakes changes. If you want to have the checks, though, feel free to add them to tox.ini file: http://www.dominicrodger.com/tox-and-travis.html and disable the whitespace-related checks.

OK, no problem!

These things won't cause any Travis failures. They're just reported at the end of an already successful build.

pep8 is just style, but pyflakes is worth keeping an eye on as it can show logical errors like referring to undefined variables.

Anyway, I've never used tox before, I'll look into it.