It checks Python files with pep8 and pyflakes tools and makes it via subprocess (i.e. using your Python version and with your virtualenv).
https://github.com/vorushin/sublimetext_python_checker

Check out my fork of SublimeLint, for python it checks with PyFlakes and PEP 8 and also it has a improved way of live checking code: github.com/Kronuz/SublimeLinter

Yeah, I like Kronuz’s better. Sorry, your linter wasn’t live linting. What are it’s pro’s over Kronuz’s anyway?