python: small cleanup
python: small cleanup

Change-Id: I9abf91e75dd6d355285283510b45ee7b4ffabf7e

aldebaran/libqi-java,vbarbaresi/libqi,aldebaran/libqi,aldebaran/libqi-java,bsautron/libqi,aldebaran/libqi,aldebaran/libqi-java,aldebaran/libqi