Ok. I will do it and change where it appears in the SC when this pull request is finished and correct :) 
seems to be in this places:

```bash
$ grep -r "sys.version" .
./circus/tests/test_watcher.py:            minor = sys.version_info[1]
./circus/tests/test_watcher.py:            minor = sys.version_info[1]
./circus/util.py:    py_ver = sys.version.split()[0][:3]
./circus/py3compat.py:PY3 = sys.version_info[0] == 3
./setup.py:if not hasattr(sys, 'version_info') or sys.version_info < (2, 6, 0, 'final'):
```

Thank you!