stylish: Make and preserve code PEP8 compliant

Current code is not PEP8 compliant. I'm opening this issue in order the discuss the convenience of a stylish patch to format it to PEP8, and then a patch to install a git pre-commit hook to force PEP8 compliance in the future.

This would save us time later by allowing automatic stylish. In my tests, 'autopep8' tool serves well this purpose.